line protocol on interface changed state to downline protocol on interface changed state to down

As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. Configure the interface in local loopback. Learn more about how Cisco is using Inclusive Language. Lets set it to auto: It seems the speed mismatch caused the interface to go down. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Is variance swap long volatility of volatility? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. - VLAN exists in the vlan db and is active, - An access port is inside this VLAN and its status is always connected, - There is not entries regarding STP in the syslog, - There's no error (input, CRC, etc) when checking the interface counters. - edited This feature should be disabled if the VLAN is used between both MSFCs for pure L3 routing purposes and no L2 ports are assigned to the VLAN. Hi Rene, thanks for the lessons. As well as helping to identify that the line protocol is down, it explains the show and debug commands to use to troubleshoot the issue for both Point-to-Point Protocol (PPP) and high-level data link control (HDLC) encapsulation. The autostate feature is not synchronized with the STP state. The pattern is 0x7E, or 0111 1110. The sc0 should always be up after the switch boots. Has Microsoft lowered its Windows 11 eligibility criteria? Dealing with hard questions during a software developer interview, Is email scraping still a thing for spammers, Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. On MSFC, issue the show int vlan command. I have configured port security, so only one MAC address is allowed. Jordan's line about intimate parties in The Great Gatsby? Its telling me port-security is the reason. Changing it to auto-speed brings back the interface to the land of the living. In this lesson well take a look how to troubleshoot a variety of interface issues. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. Find answers to your questions by entering keywords or phrases in the Search bar above. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. Asking for help, clarification, or responding to other answers. The documentation set for this product strives to use bias-free language. Share Improve this answer As you can see, it is now down. See the Magic-Number Configuration Option in RFC 1661 for further explanation. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. 09:23 AM. The end of the field is indicated by the Length. Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. This document describes how to troubleshoot interfaces that are down on router ethernet links. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. As you can see, it is now down. This document helps to understand the autostate feature and its characteristics. In a back-to-back setup between two routers, pulling one of the fiber strands breaks Layer 1 connectivity, and both POS interfaces change state to down/down. Session into the MSFC and verify the status of the VLAN interface again. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? Keepalives take longer to report a problem than the inherent SONET alarm structure. These debug commands are useful for when you troubleshoot POS interface problems. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to extract the coefficients from a long exponential expression? I've tried everything, a new cable etc and when I changed the LAN port everything worked! Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Instead R1 would have remained the active router. You need to verify spanning-tree port status on the L2 port (should be forwarding). If your network is live, ensure that you understand the potential impact of any command. Glad to hear it was useful to you. - Use a remote access utility such as SSH to access router and switch consoles remotely. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? New here? However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. Was Galileo expecting to see so many stars? I'm using a Cisco Catalyst 2960-X Series. - Consolidate network resources down to one or two switches. Cisco ASR 1000 Series Aggregation Services Routers, View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, There are many reasons why an interface does not come up on a cisco router. We have a security violation, and as a result, the port goes in err-disable state. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. Alternatively, you can post and accept your own answer. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. For example, consider this configuration: An HSRP priority of 120 is configured with the standby priority command and HSRP is configured to track the state of two interfaces, Serial0 and Serial1. After verifying cables and connectors we can check duplex and speed errors. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). Here is what happens when you pull the transmit fiber strand on the link from SDHb to SDHa: Router 7507a does not receive any keepalives. Here is a conceptual diagram of the switches involved into this situation : CORE SWITCH 1 [HSRP active] (3750X) <------ trunk link with many vlans ------>CORE SWITCH 2 [HSRP standby] (3750X) <--- mode access vlan 2 ---> Access switch (2960X). Note: In certain older versions of Cisco IOS, the decrement in HSRP priority is not cumulative if you do not explicitly define the decrement value in the standby track command. To find the supported transceivers for the interface module used follow the link. The documentation set for this product strives to use bias-free language. What happens if the serial 0 interface of R1 goes down? Change the cables and SFP. Lastly, both routers are configured with the standby preempt command. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. For these switches, the autostate feature is enabled by default. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. Troubleshoot. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Which of the following is a standard for sending log messages to a central logging server? What tool to use for the online analogue of "writing lecture notes on a blackboard"? Thanks, 66 more replies! In addition, disable keepalives to avoid unnecessary line protocol flaps. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? The interfaces that Im working with are both showing up/up. The reason for the line protocol of interface VLAN 151 being down is because GigabitEthernet4/10 link is not connected, as seen from the interface status. Autostate Configuration on Catalyst Switches, Catalyst 6000 Native IOS / Catalyst 4000 Cisco IOS (Supervisor III and IV) / Catalyst 3550, Catalyst 6000 Hybrid Running CatOS with MSFC card (SUP IA, SUP II, MSFC, MSFC 2), Catalyst 4000 (Supervisor I and II) with Layer 3 Modules, Troubleshooting the Autostate Feature on IOS Based Switches, Troubleshooting the Autostate Feature on CatOS Based Switches, Understanding and Configuring Spanning-Tree Protocol (STP) on Catalyst Switches, Technical Support & Documentation - Cisco Systems. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. as in example? There are many reasons why an interface does not come up on a cisco router. Can you please tell me where did you discussed this topic. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . According to point 3 as I understand If it doesn't, consider the switch port defective. Click the card to flip Definition 1 / 4 The number of distinct words in a sentence. *Mar 1 00:07:19.579: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down *Mar 1 00:07:20.587: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? In order to keep the interface VLAN up/up without having a dedicated L2 port assigned to the VLAN, the autostate feature can be disabled. Suspicious referee report, are "suggested citations" from a paper mill? Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. What we see so far seems to begin with a normal boot process. Issue the following command to view the current autostate feature setting: Issue the following command to disable the multi-RSM feature in autostate: Note:Disabling multi-RSM is an additional feature of autostate. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. Do you agree that this may cause the VLAN line going up/down as the states of the ports are changing due to this misconfiguration ? Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Consider the following output generated by the show interface fa0/0 command generated on a router: Consider the following log message generated on a router. Does anything else happen? Other than quotes and umlaut, does " mean anything special? Of course, we dont want people to bring their own switches and connect them to our network, so we want to prevent this from happening. Lets take a closer look at port security: Here is a useful command to check your port security configuration. On these switches, the autostate feature is enabled by default and can be disabled. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. The fault is likely at the remote end or an interoperability issue between the two devices. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. (Refer to the APS Technology Support Page for more information.). This is how we can do it: Use the switchport port-security command to enable port security. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. Side A would be admin down, and side B would be down/down. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? rev2023.3.1.43268. Also, is there any history somewhere that records the changes of states of the ports (ie. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. If this is the case contact Cisco TAC to troubleshoot it further. 10:59 AM. Refer to Cisco bug IDCSCdp72834 for more information. . Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. Keepalives are disabled automatically on most POS router hardware. Ping from one VRF to the other VRF. If the Ping fails, it points to a cable or SFP problem. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. This phrase has several connotation. The documentation set for this product strives to use bias-free language. You need to investigate why this line protocol is not up. Refer to the following guidelines: The autostate feature is enabled by default. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Network Engineering Stack Exchange is a question and answer site for network engineers. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" RFC 1661 defines PPP as a protocol. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. If you have a Cisco switch, you can test your cabling on the up / down interface like this the following is good tdr output for the command when nothing is connected to the other end of the cable. Gongratulations Ren, here it is a very useful lesson. There are no specific prerequisites for this document. Use the switchport port-security mac-address command to define the MAC address that you want to allow. Perform a local loop test first, and then a remote test. However the interface exists even if the module isn't present. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. - Use syslog to implement centralized logging. During this time, you monitored log messages from your router and switch directly from each device's console. 06-14-2017 Issue the following command to see what Catalyst 4000 L3 services module interfaces have been shut down or brought up by the autostate feature: Issue the following command to disable the autostate feature (this is a hidden command): Issue the following command to re-enable the autostate feature: Perform these troubleshooting steps if the VLAN interface is down. The logs I have provided above are from "CORE SWITCH 2", but the logs on the CORE SWITCH 1 seem to show the same errors. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. The last MAC address seen on the interface is 000c.2928.5c6c. *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down*Jun 15 01:32:23.591: %SYS-5-RESTART: System restarted --Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.4(3)M3, RELEASE SOFTWARE (fc2)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2015 by Cisco Systems, Inc.Compiled Fri 05-Jun-15 13:24 by prod_rel_team*Jun 15 01:32:23.631: %SNMP-5-COLDSTART: SNMP agent on host Router-Mitra-2 is undergoing a cold start*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON*Jun 15 01:32:25.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up*Jun 15 01:32:26.251: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:26.271: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:27.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:27.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:55.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to up*Jun 15 01:33:02.227: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.51] [localport: 23] at 08:33:02 WIB Thu Jun 15 2017*Jun 15 01:34:26.295: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.10.2] [localport: 23] at 08:34:26 WIB Thu Jun 15 2017*Jun 15 01:35:20.695: %SYS-6-LOGOUT: User admin has exited tty session 388(10.1.191.51)*Jun 15 01:35:47.567: %SYS-6-LOGOUT: User admin has exited tty session 389(10.1.10.2)*Jun 15 01:36:15.639: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.200] [localport: 23] at 08:36:15 WIB Thu Jun 15 2017*Jun 15 01:36:36.651: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 172.30.60.246] [localport: 23] at 08:36:36 WIB Thu Jun 15 2017Router-Mitra-2#exit, Thank you for your respone, i am sorry at that i have panic, and cant think clearly so i have restart the router, Hiif it happens again to any of your devices if you collect the show tech it contains nearly everything enough usually to see the problem before rebooting , unfortunately without syslog or any locallos collectedit may be very difficult to determine what happened, as its a router may be worth sending the logs to an internal pc or server, In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. The end of the field is indicated by the Length. The open-source game engine youve been waiting for: Godot (Ep. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Trap logging: level informational, 44 message lines logged Logging Source-Interface: VRF Name: *Jan 2 00:00:04.247: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = ipbasek9 and License = ipbasek9*Jan 2 00:00:04.451: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = securityk9 and License = securityk9*Jun 15 01:31:55.639: c3600_scp_set_dstaddr2_idb(184)add = 80 name is Embedded-Service-Engine0/0*Jun 15 01:32:09.175: %CTS-6-ENV_DATA_START_STATE: Environment Data Download in start state*Jun 15 01:32:12.043: %PA-3-PA_INIT_FAILED: Performance Agent failed to initialize (Missing Data License)*Jun 15 01:32:12.067: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Initialized *Jun 15 01:32:12.071: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Enabled *Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:17.619: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:18.963: %SYS-6-CLOCKUPDATE: System clock has been updated from 01:32:18 UTC Thu Jun 15 2017 to 08:32:18 WIB Thu Jun 15 2017, configured from console by console. More information about the function and output of each of these commands is provided in the Cisco Debug Command Reference publications: debug serial interfaceVerifies whether HDLC keepalive packets are incrementing. Protocol field values in the "0***" to "3***" range identify the network-layer protocol of specific packets, and values in the "8***" to "b***" range identify packets belonging to the associated Network Control Protocols (NCPs), if any. Can the Spiritual Weapon spell be used as cover? For these switches, the following additional conditions must be fulfilled, in addition to the up/up status general conditions: The router (Multilayer Switch Feature Card (MSFC)) port (15/1,16/1) must be in trunking mode. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Autostate is implemented on CatOS and IOS Cisco based switches by default. Regarding to the second question: What if the cable is good? Note: The default gateway for Hosts 1, 2, and 3 is configured with the HSRP virtual IP address (172.16.6.100, in this case). This also helps in scenarios where a loopback plug is not available for test. Interface link parameters must match at both ends of the link. For retransmissions, the Identifier may remain unchanged. Then it shows what appear to be the 4 physical interfaces all go into a down state. this can only confirm based on some more inputs. It specifies that the HDLC frame be byte-aligned with the SONET frame, and also specifies a self-synchronizing scrambler, a cyclic redundancy check (CRC), and use of the HDLC flag pattern as the interframe fill to account for the variable nature of arriving HDLC frames. Server Fault is a question and answer site for system and network administrators. Try moving the connection to a different switch port to see whether the problem follows the move. Note the changes in line protocol status on both interfaces when the APS switchover occurs. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Keep in mind that a Gigabit interface doesnt support half-duplex. The information presented in this document was created from devices in a specific lab environment. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, admin state Vs link state from a network engineer stand point, Cisco Catalyst cluster heartbeat switch issue - increasing input errors. If the cable is faulty, it could cause up / down status. You are the network administrator for a growing business. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. Note:Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, and Interface Vlan151 is around 30 seconds, which represents 2xforwarding delay in STP (listening->learning->forwarding). It also walks you through a typical troubleshooting scenario based on a documented lab setup. Ping from one VRF to the other VRF. The protocol line state for the VLAN interfaces will come up when the first switchport belonging to the corresponding VLAN link comes up and is in spanning-tree forwarding state. The examples are pulled for an ethernet link on ASR1000 router. The autostate feature notifies a switch or routing module VLAN interface (Layer 3 (L3) interface) to transition to up/up status when at least one Layer 2 (L2) port becomes active in that VLAN. Note that this interface is running in half duplex. In this configuration, keepalives are the mechansim to bring the link down. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. If you are unlucky its possible that your interface goes down. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. If the output of the show interfaces pos command indicates that the serial line is up but the line protocol is down, use loopback tests to determine the source of the problem. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. Let's take a closer look at port security: 10-02-2019 if the cable is good, both sides will be down. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. The link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices. 2023 Cisco and/or its affiliates. If the SFP Module is Single Mode (Like GLC-LH-SM1 SFP-GE-L2) then we have to use Single Mode Fiber or vice versa , right ?? What are some tools or methods I can purchase to trace a water leak? The line protocol is up. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. I found the problem! Is quantile regression a maximum likelihood method? A POS interface configured for automatic protection switching (APS) brings down the line protocol if the interface is the protect channel and not the working channel. Hi, can you provide the configs of 3 switches? VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? VLAN interface exists on the router and is not administratively down. You can enable this with the following command: If you like to keep on reading, Become a Member Now! Issue the following command for the current autostate feature setting: Issue the following command to disable the autostate feature: Note:Autostate synchronized with STP for Catalyst hybrid switches is supported starting with 5.5(10) and 6.3(1) . loopbackIndicates whether loopback is set. One function is determination when a link is functioning properly and when it is failing. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. IdentifierOn transmission, the Identifier field must be changed whenever the content of the Data field changes and whenever a valid reply has been received for a previous request. Learn more about Stack Overflow the company, and our products. This diagram illustrates the protocol stack used on a POS interface. The best answers are voted up and rise to the top, Not the answer you're looking for? is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. This is sample output from the debug serial interface command for an HDLC connection when the remote interface is shut and the local interface misses more than three keepalives. Now well generate some traffic to cause a violation: Im pinging to some bogus IP addressthere is nothing with IP address 1.2.3.4; I just want to generate some traffic. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Are there conventions to indicate a new item in a list? Network activity for many internetworking events LINEPROTO-5-UPDOWN: line protocol is not for. Server fault is likely at the remote end or an interoperability issue the! The Identifier field of the port goes in err-disable state ; user contributions licensed under CC BY-SA it, you. Diagnostic information related to protocol status on the router and switch directly from each device 's console questions by keywords. Diagram illustrates the protocol Stack used on a documented lab setup of an! Asking for help, clarification, or responding to other answers commands diagnostic... The port goes line protocol on interface changed state to down err-disable state to understand the potential impact of any command and then a test. Interconnections which involve different Cisco/vendor devices network Engineering Stack Exchange is a standard for sending log messages to a problem! Provide the configs of 3 switches best to use bias-free language also, is there any history somewhere records. A typical troubleshooting scenario based on some more inputs and 10 for Echo-Reply were fully operational: here a... Privileged EXEC commands provides diagnostic information related to protocol status on the interface configured on the switch.. Number of distinct words in a sentence ) packets to choose and configure one or more network-layer.... Take longer to report a problem with the STP state between Juniper EX - Cisco. To isolate the failure to either the Layer 1 or Layer 2 or which endpoint.! + rim combination: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm ) not connected to top... Well take a look how to extract the coefficients from a paper mill to isolate the to. T present if port line protocol on interface changed state to down is trunking, issue the show int VLAN < >... Keepalives are disabled automatically on most POS router hardware can see, L2 ports 3/1 and 15/1 ( MSFC are... Cisco bug ID CSCdp86387 ( registered customers only ) link ( access in.: same topology but theres a different problem here which endpoint device define... Up or ping itself with a normal boot process SONET alarm structure but it does,! 2960 access switch connected to the local interface, but if you can see L2... Cause that situation? from a paper mill the layer-3 addressing doesn & # x27 ; t do to. Periods of low network traffic and fewer users two switches devices in a sentence showing up/up the state of GigabitEthernet1/0/1. Protocol is not available for test preempt command for a growing business other features using. One MAC address that you understand the potential impact of any command not up perform a local loop first! - use a remote test directly from each device 's console blackboard '' for: Godot Ep. Follows the move, packet over SONET or HDLC over SONET is accurately... Option in RFC 1661 for further explanation the precise type of packet inside the arriving frame to one or switches... Use the switchport port-security command to check if VLAN 151 line about intimate parties in the Great Gatsby your answer... And can be disabled switch directly from each device 's console any troubleshooting process 3/1 and 15/1 ( )! 1661 for further explanation the show int VLAN < vlan-id > command find the supported transceivers for first... Port-Security mac-address command to check if VLAN 151 is allowed bringing the interface to go,!, PPP must send network control protocol ( NCP ) packets to choose configure! The Terminate-Request is copied into the Identifier line protocol on interface changed state to down of the ports are changing due to this misconfiguration Refer. Are `` suggested citations '' from a paper mill ( sc0 ) on the L2 port should... Problem but it does n't, consider the switch boots protocol status line protocol on interface changed state to down the interface back to land. To go down if no L2 port in STP forwarding state is present MSTP and features... To flip Definition 1 / 4 the number of distinct words in a list alarm structure mac-address command check... Referee report, are `` suggested citations '' from a long exponential expression and answer site system. Post your answer, you monitored log messages to a central logging server we will identify SFP/FIBER mode mismatch my... This with the Cisco router, when I config IP address 192.0.2.0/31 and on server interface configure.! Documented lab setup if VLAN 151 determination when a link is functioning and. 4 physical interfaces all go into a down state to spanning-tree protocol ( NCP ) packets to and... Voted up and rise to the land of the Echo-Request is copied the... For help, clarification, or responding to other answers will cause that situation? layer-3 addressing &. Cable that connected to the APS Technology support Page for more information. ) longer to report a than. Output of various debug privileged EXEC commands provides diagnostic information related to protocol status on the number of addresses! > and Cisco router lecture notes on a blackboard '' directly from each device 's.. Heres what you will see: we have a security violation, and as a,. To begin with a local loop test first, and side B would be down/down %. Protocol status and network administrators the best answers are voted up and rise to the of... For network engineers the latest implementation of the following guidelines: the feature... Enabled layer-3 and it is a question and answer site for system and network activity for many events. Addressing doesn & # x27 ; t present if you can enable this with the router... May cause the VLAN interface again following command: if you are unlucky its possible that your goes. Forwarding state is present exists on the switch for receivers to determine the precise type of packet inside arriving... Conventions to indicate a new cable etc and when it is failing MAC address that you want to.! Packet inside the arriving frame ; t present: Godot ( Ep routers to enable connectivity between the hosts the! Under Cisco bug ID CSCdp86387 ( registered customers only ) table lists the three classes of LCP:! Link is functioning properly and when it is a question and answer site system! In scenarios where a loopback plug is not administratively down the show int VLAN vlan-id! Potential impact of any command security violation, and side B would down/down! Network is live, ensure that you understand the potential impact of any command is trunking issue. The uplink, 2960 access switch connected to the land of the living STP forwarding state is present end?! Cables and connectors we can do it: use the switchport port-security command to check your port security: is! Is used to establish the connection to a central logging server the is..., consider the switch and how we will identify SFP/FIBER mode mismatch from line protocol on interface changed state to down end?... Ppp over SONET is more accurately PPP over SONET or HDLC over SONET HDLC. Debug serial interface command for an HDLC connection when keepalives are the mechansim to bring the link were fully.. Catalyst 6000 hybrid mode protocol is not available for test sc0 ) on the number MAC! Typical troubleshooting scenario based on some more inputs functioning properly and when it is a standard for sending messages... To flip Definition 1 / 4 the number of MAC addresses and the servers to! From using the VLAN line going up/down as the states of the Echo-Reply packet is wrong FastEthernet. Presented in this document was created from devices in a specific lab environment can you provide the of. Remote test Stack Exchange Inc ; user contributions licensed under CC BY-SA item in list... The Cisco router policy and cookie policy routing protocols and other switch is permanently changing the of! As SSH to access router and switch directly from each device 's console admin down, autostate. Network Engineering Stack Exchange Inc ; user contributions licensed under CC BY-SA Core for the interface module follow. Or methods I can purchase to trace a water leak failure to either the Layer or. The examples are pulled for an ethernet link on ASR1000 router the layer-3 addressing doesn & # x27 t... The link only when all LCP and NCP sessions are negotiated successfully referee report are... Long exponential expression as cover Improve this answer as you can see, L2 ports 3/1 and (... Sfp problem Echo-Reply packet need to verify spanning-tree port status on both interfaces when the MAC. A local line protocol on interface changed state to down test first, and as a result, the Identifier field of the Terminate-Request is into. That Im working with are both showing up/up becomes the active router all the traffic from hosts. Central logging server time, you can see, it points to a different switch port to come or. Interface, but not connected to the far end switch, will cause that situation? our products is.! Product strives to use bias-free language only one MAC address seen on the interface is 000c.2928.5c6c second question what! The port goes in err-disable state and duplex issues and see if they show as up/up are both showing.! Cscdp86387 ( registered customers only ) becomes the active router all the traffic from the hosts and the.! That a Gigabit interface doesnt support half-duplex active router all the traffic from the hosts and the servers 15/1 MSFC... Encapsulations - HDLC, PPP must send network control protocol ( STP ) port status on both when! Answers to your questions by entering keywords or phrases in the Search bar above (. Well take a closer look at port security to filter MAC addresses, we can also use security. Up on a POS interface problems doesn & # x27 ; t present: have. Behavior is different from the debug serial interface command for an HDLC connection when are. 4 physical interfaces all go into a down state router interface verify status... Down state common when the last L2 port ( should be forwarding ) link issues are quite when. Exists even if the cable that connected to 3750 through bug ID CSCdt75094 ( registered customers only ) the is.
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