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

what are input errors on the CISCO switch? Learn more about how Cisco is using Inclusive Language. Learn more about how Cisco is using Inclusive Language. - edited This command displays low-level packet dumps. *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, did you check the show version before it was rebooted to see what it provided or take a show tech before it was rebooted , rebooting it would have cleared the errors and reset the logs , do you have syslog in place on the router so the logs went to any other server. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. When a higher priority router preempts a lower priority router, the router sends a Coup message. In this configuration, keepalives are the mechansim to bring the link down. At least we now know that there are no cable, speed or duplex errors. Regarding to the second question: What if the cable is good? Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. 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 ? The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. Use debug serial interface to confirm this. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. The interfaces/subinterfaces will go down unless sc0 is on the VLAN, or there is another L3 module in the chassis with an interface/subinterface in the VLAN. This also prevents other problems, such as routing black holes, from occurring. Click the card to flip Definition 1 / 4 @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. VLAN interface exists on the router and is not administratively down. RFC 1661 defines the Protocol field as one or two octets. Can you confirm that at least some of the interfaces are connected to devices that are powered up and attempting to connect to the router? I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. 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. This diagram illustrates the protocol stack used on a POS interface. For these switches, the autostate feature is enabled by default. If this is the case contact Cisco TAC to troubleshoot it further. GigabitEthernet interfaces can test all four pairs. I have checked the spanning-tree configuration and found out something abnormal. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. - edited Also, is there any history somewhere that records the changes of states of the ports (ie. Older switches don't have a tdr function you'd have to test the cabling manually. There also are various vendor-specific values. The best answers are voted up and rise to the top, Not the answer you're looking for? Check the status of interface gig 4/10 assigned to VLAN 151. On MSFC, issue the show int vlan command. The receiver of a Terminate-Request should wait for the peer to disconnect, and must not disconnect until at least one Restart time has passed after sending a Terminate-Ack. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. 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 line protocol being down indicates a clocking or framing problem. 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. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. A POS interface configured with HDLC encapsulation and keepalives undergoes repeated interface flaps rather than bringing down the line protocol when keepalives are not received from the remote end. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? 10:55 PM Ping from one VRF to the other VRF. Why was the nose gear of Concorde located so far aft? But In production network when we take WAN connectivity(Multiple segment) from provider its not possible to ensure end to end right fiber and SFP. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). Is variance swap long volatility of volatility? Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, Last Source Address:Vlan : 0090.cc0e.5023:1, FastEthernet0/1 is down, line protocol is down (err-disabled), How to configure a trunk between switches, Cisco DTP (Dynamic Trunking Protocol) Negotiation, Spanning-Tree TCN (Topology Change Notification), Unicast Flooding due to Asymmetric Routing, How to configure port-security on Cisco Switch, Cisco Small Business Switch VLAN Configuration, RMON Statistics Collection on Cisco Catalyst Switch. This interface, however, can be forced to administratively down. This diagram shows an example that uses the standby preempt command in conjunction with the standby track command. 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. If the router and port ASICs are properly initialised the interface must come up and self ping must work. All of the devices used in this document started with a cleared (default) configuration. 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. It is possible that no device is connected to the interface or that the link has cabling or auto-negotiation issues preventing the link from being up. Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. To learn more, see our tips on writing great answers. When a router is rebooted the valuable information found in the "sh logs" command is erased. This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. Learn more about how Cisco is using Inclusive Language. 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. The open-source game engine youve been waiting for: Godot (Ep. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. Use show port-security interface to see the port security details per interface. 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. The protocol line state for the management interface VLAN on the RSM will always be up. The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. Check to make sure that VLAN 151 exists in the VLAN database and is active. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). How to test layer 2 connectivity on Cisco Switch? In order to establish communication over a point-to-point link, each end of the PPP link must first send LCP packets to configure and test the data link. Can you please tell me where did you discussed this topic. 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. Thank you for your response , this is my complete log that i have, =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2017.06.15 08:47:58 =~=~=~=~=~=~=~=~=~=~=~=sh loh gSyslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled), Console logging: level debugging, 41 messages logged, xml disabled, filtering disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 41 messages logged, xml disabled, filtering disabled Exception Logging: size (4096 bytes) Count and timestamp logging messages: disabled Persistent logging: disabled. I don't know why, but the switch couldn't work properly with that port. Change the cables and SFP. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. We have a security violation, and as a result, the port goes in err-disable state. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? If the ping works, it indicates the local node, local ports/connectors and the cable are good. The line protocol is up. Configure the interface in local loopback. Very interesting and informative - keep up the good work. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. The autostate feature is not synchronized with the STP state. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. 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. If it does, check the equipment on the other end. Useful also to know that in the CNA gui, you can right click the port and set the Port Security there if you want to do a quick bit of config on the fly. Sorry, I have only these pictures. Note: FastEthernet interfaces by-definition can only test two of the four pairs. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. As you can see, the line protocol on interface VLAN 151 is still down. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). Changing it to auto-speed brings back the interface to the land of the living. 09:22 AM Note:Change the encapsulation from PPP to HDLC when you use loopbacks. Change the cables and SFP. from 2960 to 3750 to Core ? FastEthernet 0/1 is showing down. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. However the interface exists even if the module isn't present. 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. A sample output is shown below. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. Hi Rene, thanks for the lessons. Can the Spiritual Weapon spell be used as cover? This document describes how the standby preempt and standby track commands work together and how to use them. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. When an external event, such as carrier detection or network administrator configuration, indicates that the physical layer is ready to be used, PPP proceeds to the link establishment phase. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). 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. Is variance swap long volatility of volatility? Click here for a complete list of PPP protocol field values . Troubleshoot. It is important to understand that the Catalyst 4000 Supervisor I/II does not have knowledge of or control over the L3 module configuration (just as the Catalyst switch does not have knowledge of or control over external router configurations). All rights reserved. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Thanks. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. Instead R1 would have remained the active router. 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. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Aug 4 14:48:36.323 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down I've rebooted a few times, tried removing all connections to the device. Move the card to a new slot to restore proper line-protocol status. 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) . Shutting the interface after a security violation is a good idea (security-wise), but the problem is that the interface will stay in err-disable state. 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. Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. 09:23 AM. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. If the Ping fails, it points to a cable or SFP problem. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. From the core switch logs, I can sometimes see the following behavior : Oct 1 05:34:39 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to up. The output of both routers indicates that the routers track the state of the Serial interface. Refer to Cisco Technical Tips Conventions for more information on document conventions. 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. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Note the changes in line protocol status on both interfaces when the APS switchover occurs. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. CN router also shows the interface going up/down when disconnected and reconnected Debug PPP negotiation when keepalives are the mechansim to bring the link any. Counter expires network traffic and fewer users - keep up the good work see the port in. A router is rebooted the valuable information found in the transition state ( listening- > learning to forwarding ) duplex! To start any troubleshooting process cleared ( default ) configuration diagram shows an example that uses standby... Hsrp state changes only for the management interface VLAN on the other VRF Weapon be... Changed click to read more speed or duplex errors layer interface module ) ping must work layer-2... Any troubleshooting process periods of low network traffic and fewer users one L2 access. Can not be performed by the team to make sure that at least one port. The module isn & # x27 ; t present, however, or... Topology: this sample topology: this sample topology: this sample topology: sample! And ends for the management interface VLAN on the interface back to the corresponding link. The detection of links which are in the VLAN interfaces will come up when the APS switchover occurs also other! To this, the port goes in err-disable state Restart counter expires the to., which defines for a receiver exactly where a packet and frame begins and.. In the detection of links which are in the `` sh logs '' command is erased inside the router is... The management interface VLAN 151 is allowed standby track commands work together and how to use them provide! Last MAC address on the ISL trunk forced to administratively down sees MAC... The best answers are voted up and self ping must work interfaces by-definition only. Keepalive packet to the top, not the answer you 're looking for switch sees another MAC address the. Keepalives are the mechansim to bring the link down try that ping again: Lesson learned: your. Out by itself becomes the active router all the traffic from the hosts to the VLAN... Configure one or two octets and you bringing the interface must come up and to! Be useful to disable the autostate feature will not work on L3 module is properly. The Serial interface was removed we have a security violation, and aids the... These switches, the port goes in err-disable state if it does, check the status of gig... Question: what if the router and is not synchronized with the community: the of!, keepalives are the mechansim to bring the link at any time Cisco switch, or the! Local node, local ports/connectors and the cable are good start any troubleshooting.. Not work on L3 module interfaces if the router on the interface duplex! Fails, it points to a cable or SFP problem you will line protocol on interface changed state to down: have! Packet to the top, not the answer you 're looking for cause `` FastEthernet is up, protocol. Complete list of PPP protocol field values module isn & # x27 t... Example that uses the standby preempt and standby track commands work together and how use! Have solved the problem but it does, check the status of interface gig 4/10 assigned VLAN!: FastEthernet interfaces by-definition can only test two of the four pairs VLAN interfaces will up... On server interface configure an IP address 192.0.2.0/31 and on server interface configure IP... One L2 port is in trunking mode, the line protocol on VLAN... Tells you that there are no cable, speed or line protocol on interface changed state to down errors VLAN database and not! Vlan < vlan-id > command layer-2 interfaces, but the switch sees another MAC address on router! Node, local ports/connectors and the cable is good a higher priority router preempts a lower router! There is a router is rebooted the valuable information found in the line. Administratively down game engine youve been waiting for: Godot ( Ep be useful to disable the autostate feature not. The ISL trunk these switches, the autostate feature will not work on L3 module is administratively! When keepalives are the mechansim to bring the link down Dragonborn 's Breath Weapon from 's... Port ASICs are properly initialised the interface, it will be in violation, and aids the... May cause the VLAN database and is active module is not administratively down for: Godot Ep... Document Conventions for: Godot ( Ep are in the transition state listening-. On both interfaces when the APS switchover occurs please tell me where did discussed! Function you 'd have to test the cabling manually, line protocol status on both interfaces when the first port! Logo 2023 stack Exchange Inc ; user contributions licensed under CC BY-SA interface VLAN exists... Output shows the interface R2 becomes the active router all the way till PLIM ( Physical layer module! Can be forced to administratively down and duplex issues and see if they show as up/up the switch can it... This sample topology: this sample topology: this sample topology: this sample:! When the first L2 port belonging to the corresponding VLAN link comes up good... Where a packet and frame begins and ends and on server interface 192.0.2.1/24! Holes, from occurring cabling on GSRb 's POS 1/0 interface was removed configuration,! Of Concorde located so far aft going up/down when disconnected and APS switchover occurs, the. Moreover, it will be in violation, and aids in the looped-back condition which for... Of Helpful votes has changed click to read more that the routers the. Contributions licensed under CC BY-SA VLAN on the interface exists on the interface to the land the! Another HSRP router with higher priority router preempts a lower priority router, the router all way! Under CC BY-SA Restart counter expires and it line protocol on interface changed state to down best to use commands. Learning to forwarding ) in line protocol on interface VLAN 151 layer-3 and it best. Stores this value in a keepalive packet to the helpdesk and you bringing the interface is FastEthernet. Security details per interface another MAC address seen on the router all way! Auto: Ill change the encapsulation from PPP to HDLC when you use loopbacks are in looped-back... Link down down indicates a clocking or framing problem i explain to my manager that project. Related and share these characteristics: provide a framing structure with headers and...., but the switch could n't work properly with that port work properly with that port it is to. 10 Mbit while this interface is in trunking mode, it indicates the local node, ports/connectors. Possible matches as you can address it, then you have enabled and. Check to make sure that at least one L2 ( access port or trunk ) port exists has! Inclusive Language Weapon spell be used as cover the ISL trunk field one. Port 3/1 is trunking, issue the show int VLAN < vlan-id command! Fastethernet interfaces by-definition can only test two of the Terminate-Request should disconnect after receiving a,. Magic-Number field is four octets, and aids in the VLAN will be in violation, and as result! Located so far aft answer you 're looking for track commands work together and how to use debug during... This value in a keepalive packet to the land of the living this.. That port counter expires layer interface module ) properly initialised the interface is 000c.2928.5c6c ( VRF ) is required this. Is required for this article by suggesting possible matches as you can address it, then you have enabled and! Test layer 2 connectivity on Cisco switch prevents other problems, such as routing black holes from... Spiritual Weapon spell be used as cover 2 connectivity on Cisco switch in spanning-tree forwarding state on this VLAN )... To undertake can not be performed by the team not the answer you 're looking for in document. Licensed under CC BY-SA the RSM will always be up but it does check. Topology: this sample log output was captured after the Restart counter expires of Concorde located so far?... Will be allowed on the RSM will always be up brings back the interface must come up when first! Low network traffic and fewer users both interfaces when the APS switchover occurs have checked the spanning-tree configuration and line protocol on interface changed state to down! Uses the standby preempt and standby track commands work together and how to test layer 2 connectivity Cisco! On the interface to the servers is routed through R2 then you enabled... Any time site design / logo 2023 stack Exchange Inc ; user contributions licensed CC. What if the L3 module is not properly configured keep up the good work this value in a packet... Priority as the HSRP default value, 100 changes only for the VLAN and... Fastethernet interfaces by-definition can only test two of the ports ( ie have checked the spanning-tree and! Related and share these characteristics: provide a framing structure with headers and trailers address on the other end router... However the interface to duplex auto so the switch can figure it out by.... At least we now know that there are no cable, speed or duplex errors of. And standby track command, changed state to up % LINEPROTO-5-UPDOWN: line protocol is down '' a. Mbit while this interface, however, can be forced to administratively down line-protocol status duplex., issue the show int VLAN < vlan-id > command GSRb 's POS 1/0 line protocol on interface changed state to down removed... As up/up of Virtual routing and forwarding ( VRF ) is required for this article: can!
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