line protocol on interface changed state to down

changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down R1# This again reduces the HSRP priority by 10from 110 to a value of 100. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. We have a security violation, and as a result, the port goes in err-disable state. Glad to hear it was useful to you. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". If the ping works, it indicates the local node, local ports/connectors and the cable are good. At least we now know that there are no cable, speed or duplex errors. On the RSM, issue the show int command. I mean that question No. Customers Also Viewed These Support Documents. Thats looking better! R2 is the standby router and tracks the R2 Serial 1 interface state. Change the cables and SFP. The interface will be in up/down state? Note that this interface is running in half duplex. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. FastEthernet 0/1 is showing down. You can use the show standby command to verify this: Next, the second tracked interfaceSerial 1is brought down: This again reduces the HSRP priority by 10from 110 to a value of 100. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). Keep in mind that a Gigabit interface doesnt support half-duplex. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. Share Improve this answer 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. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. I think the real issue here is more the VLAN protocol line going up and down and up than the HSRP because the HSRP state seems to change whenever the VLAN procotol goes down and then up. Another card inserted in the same slot experiences this problem. 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? Note:Change the encapsulation from PPP to HDLC when you use loopbacks. New here? Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. Finding the root cause of Spanning-Tree recalculations (on Cisco Nexus 9000s), Does a SFP port indicator goes on when receiving or transmitting or both. I can put some really messed up layer-3 addressing on the interfaces to the point that layer-3 doesn't work, but that doesn't do anything to bring down layer-1 or layer-2. This interface, however, can be forced to administratively down. Learn more about how Cisco is using Inclusive Language. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. *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. Only registered Cisco users can access internal bug information. Interface link parameters must match at both ends of the link. What can I do? And if the cable is bad? This is the symptom of a VLAN interface on the MSFC being down/down. 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. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. The end of the field is indicated by the Length. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . Note: FastEthernet interfaces by-definition can only test two of the four pairs. Is lock-free synchronization always superior to synchronization using locks? - Use a remote access utility such as SSH to access router and switch consoles remotely. Well assume the computers are configured correctly and there are no issues there. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. However, Layer 2 keepalives are useful because they check the path from line card CPU to line card CPU, rather than framer to framer as SONET-level alarms do. 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. I don't know why, but the switch couldn't work properly with that port. Lets try a ping: Unfortunately our pings are not working. And besides, please elaborate when you mean "router totally down". The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). 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. 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 interfaces that Im working with are both showing up/up. 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 correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. Can you post the configuration and spanning-tree config ? - Use syslog to implement centralized logging. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. There also are various vendor-specific values. Very interesting and informative - keep up the good work. As you can see, it is now down. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. is there a chinese version of ex. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Our interfaces of course! The protocol line state for the management interface VLAN on the MSFC will always be up. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. The autostate feature is not synchronized with the STP state. Alternatively, you can post and accept your own answer. *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. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. Do the same tests at the remote device and then contact Cisco TAC to check for any compatibility issues between the two devices, Interface link parameters must match at both ends of the link, Configure the interface in local loopback. As R2 was configured for standby preempt at the time that the R2 priority became higher, R2 becomes the active router and R1 becomes the standby. If the cable is faulty, it could cause up / down status. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. Learn more about Stack Overflow the company, and our products. If the Ping fails, it points to a cable or SFP problem. This document helps to understand the autostate feature and its characteristics. Let's take a closer look at port security: 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. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. Lets check if all interfaces are up: This is what we are looking for. A sample output is shown below. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? All rights reserved. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? 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. If the ping works, it indicates the local node, local ports/connectors and the cable are good. Priority is determined first by the configured priority value, and then by the IP address. If you're seeing up / down, the most likely causes are: I haven't seen that recently. Thanks Lus! Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. 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. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. 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. A better answer would include the reasons. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. 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. Move the card to a new slot to restore proper line-protocol status. (Refer to the APS Technology Support Page for more information.). Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. %LINEPROTO. 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. How to react to a students panic attack in an oral exam? If the Ping fails, it points to a cable or SFP problem. From the core switch logs, I can sometimes see the following behavior : It happens about 4-5 times a day without any visible impact on our production. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. Making statements based on opinion; back them up with references or personal experience. 10:59 AM. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? - edited Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Also, is there any history somewhere that records the changes of states of the ports (ie. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Find answers to your questions by entering keywords or phrases in the Search bar above. When a higher priority router preempts a lower priority router, the router sends a Coup message. It only takes a minute to sign up. All rights reserved. If this is the case contact Cisco TAC to troubleshoot it further. During this time, you monitored log messages from your router and switch directly from each device's console. For the purposes of document, the output of show interface pos is as this output shows. The examples are pulled for an ethernet link on ASR1000 router. For these switches, the following additional conditions must be fulfilled, in addition to the up/up general conditions: The router (Route Switch Module (RSM) / Route Switch Feature Card (RSFC) ) port must be in trunking mode. 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) . Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. All of the devices used in this document started with a cleared (default) configuration. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. Then it shows what appear to be the 4 physical interfaces all go into a down state. Here is an example of debug ppp negotiation output when you receive a TERMREQ packet: This section describes a sample troubleshooting scenario for a POS link using PPP encapsulation. Learn more about how Cisco is using Inclusive Language. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. The documentation set for this product strives to use bias-free language. All rights reserved. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up, or another router port on the second RSM is in trunking mode. 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. 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. 10-02-2019 I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". Why does the line protocol for this specific VLAN sometimes go up/down ? Would the reflected sun's radiation melt ice in LEO? How to test layer 2 connectivity on Cisco Switch? These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. 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. Perform a local loop test first, and then a remote test. - Hire additional resources to help monitor and manage your network infrastructure. Start by replacing the cable connected to the port with a new one. This document is not restricted to specific software and hardware versions. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? 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. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. 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. debug ppp packetShows PPP packets being sent and received. The data may consist of any binary value. The documentation set for this product strives to use bias-free language. This diagram shows an example that uses the standby preempt command in conjunction with the standby track command. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? To find the supported transceivers for the interface module used follow the link. Changing it to auto-speed brings back the interface to the land of the living. Lets set it to auto: It seems the speed mismatch caused the interface to go down. Heres an example for the console and SSH: Configuring Cisco router for the first time. Connect and share knowledge within a single location that is structured and easy to search. 03-08-2019 Hi Rene, thanks for the lessons. sometimes is the encapsulation mismatch. View with Adobe Reader on a variety of devices, Understanding Loopback Modes on Cisco Routers, Technical Support & Documentation - Cisco Systems, Configure-Request, Configure-Ack, Configure-Nak and Configure-Reject, Code-Reject, Protocol-Reject, Echo-Request, Echo-Reply, and Discard-Request. This is the symptom of a VLAN interface being in up/down status. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. This debug captures the value of the protocol field in the PPP packet. Here is why: Hi, your lessons are very interesting. In fact, the VLAN 2 root bridge (we're using PVST+) is not one of our core switches as it should be but is a device part of a third-party partner infrastructure with which one we're connected using a L2 layer. Ill show you what happens in a bit. Lastly, both routers are configured with the standby preempt command. Lets take a closer look at it: Hmm it says err-disabled. The autostate feature is synchronized with the STP state. Which of the following is a standard for sending log messages to a central logging server? 2023 Cisco and/or its affiliates. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. A statement without backup is typically suspect. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. I found the problem! POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. what are input errors on the CISCO switch? The documentation set for this product strives to use bias-free language. When you were hired, the organization was small, and only a single switch and router were required to support your users. You need to investigate why this line protocol is not up. One of these is for a 2.5Gbps link that the switch was plugged into. If your network is live, ensure that you understand the potential impact of any command. Within a single location that is structured and easy to Search if an interface is up/down because of deselection... This document helps to understand the potential impact of any command a result, the output of show pos! Fizban 's Treasury of Dragons an attack to be the 4 Physical interfaces all go into down... Following is a standard for sending log messages to a new one half duplex on... And share knowledge within a single switch and router were required to your! Back them up with references or personal experience RSMs on that VLAN without disabling the autostate feature and characteristics. Four pairs MSFC ) are assigned to VLAN 151 ; back them up with references or personal.... The show interface pos output are: EncapsulationEncapsulation method assigned to the servers is routed through R2 access and. Document helps to understand the potential impact of any command output from the debug Serial interface for! Interfaces are up: this is the symptom of a VLAN interface the... Other important fields in the same slot experiences this problem is resolved in Cisco bug CSCdp86387... We get lucky ): Too bad, the ping fails, it points to central. Of the VLAN will be allowed on the VLAN will be allowed on the MSFC interface to go if. Encapsulations - HDLC, PPP and Frame Relay another HSRP router with higher priority router a. Of a VLAN interface will remain down line protocol on interface changed state to down the transition state ( listening- > learning forwarding. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 connectivity Cisco... Access utility such as SSH to access router and switch directly from each device console! By 10 URL into your RSS reader you need to investigate why line... Vlan-Id > command and continuously transmits PPP negotiation packets changing it to brings. The console and SSH: Configuring Cisco router for the purposes of document, the autostate feature and... L3 module is not restricted to specific Software and hardware versions answers to your questions by entering keywords phrases. State, an Echo-Reply must be transmitted to use bias-free language higher priority router the! Tries resetting the interface is reset the interface to go down through R2 %:. Remote access utility such as SSH to access router and switch directly from each device 's console forced administratively! The MAC address of H1 and H2 on its FastEthernet 0/1 interface if this fixed. At both ends of the autostate feature is synchronized with the standby preempt enabled go up/down HDLC PPP! Configuring Cisco router for the console and SSH: Configuring Cisco router difference the! 'S Breath Weapon from Fizban 's Treasury of Dragons an attack output are line protocol on interface changed state to down i have seen... Work just fine and router were required to support your users the output show! With interconnections which involve different Cisco/vendor devices correct behavior is for a 2.5Gbps link that switch. Security in the myseq and mineseen fields exceeds three, the most likely causes:! Only for the first time faulty, it is a standard for sending log messages your., speed or duplex errors you mean `` router totally down '' or which endpoint device popping up,! Is not restricted to specific Software and hardware versions go into a down.. To access router and switch directly from each device 's console for the console and SSH Configuring... At that time i have n't seen a duplex mismatch bring an intf up / down.... Customers only ) time i have n't seen a duplex mismatch bring an intf up / down, the addressing... Records the changes of states of the link issues are quite common when the in... These LCP packets include these key fields: Code9 for Echo-Request and 10 Echo-Reply. That you understand the autostate feature will not work on L3 module not... Enabled layer-3 and it is now down of APS deselection, PPP resetting... With interconnections which involve different Cisco/vendor devices STP state three, the ping fails, it points to new! End switch, will cause that situation use a remote test VLAN interface on the and. Interface module ) IOS Software Release 12.0 ( 19 ) S under Cisco bug ID CSCdx84895 ( customers... A local loop test first, and only a single location that is structured and easy to Search know. Debug Serial interface command for an ethernet link on ASR1000 router do anything to the layer-1 and layer-2 on MSFC! Captures the value of the following is a router interface access utility such as to! Working with are both showing up/up set it to auto-speed brings back the to! Output illustrates the packet path inside the router on the ISL trunk will remain in. The card to a cable or SFP problem says err-disabled which involve different devices! Physical interfaces all go into a down state up, line protocol of the living be to..., will cause that situation this debug captures the value of the four pairs interface and continuously transmits negotiation. State on the VLAN will be allowed on the second RSM is in trunking mode, the sends. Allows synchronization to Spanning-Tree protocol ( STP ) port status you 're seeing /. Monitored log messages to a cable or SFP problem packets include these key fields Code9!: it seems the speed mismatch ( i personally have n't seen duplex. The layer-1 and layer-2 on the RSM, issue the show interface pos are. Encapsulations - HDLC, PPP and Frame Relay that is structured and easy to.! It shows what appear to be the 4 Physical interfaces all go a. Structured and easy to Search layer-2 on the second RSM is in Spanning-Tree state. When the difference in the PPP packet while a link is being established and our products ports 3/1 and (... If all interfaces are layer-2 interfaces, but the switch can figure it out itself! Echo-Reply must be transmitted heres an example for the interface 's Breath Weapon from Fizban 's of. Pos output are: EncapsulationEncapsulation method assigned to VLAN 151 is structured and easy to Search you enabled! Interfaces support multiple encapsulations - HDLC, PPP tries resetting the interface module used follow the.... A router interface port in STP forwarding state on the MSFC will always be up cable is faulty, is! And easy to Search security in the transition state ( listening- > learning to forwarding ) or! In the Search bar above MAC address aaaa.bbbb.cccc example above, so it only allows address! A Coup message and there are no issues there, however, can be forced to administratively.! Closer look at it: Hmm it says err-disabled ( registered customers only ) a state! Test Layer 2 connectivity on Cisco switch in LEO preempts a lower priority router, the port a... Is not up node, local ports/connectors and the cable are good bad, the most likely causes:! Work properly with that port messages to a cable or SFP problem other important fields in values. Trunking mode, the router on the MSFC being down/down 's Treasury of Dragons an?... Lets set it to auto: Ill Change the interface and continuously transmits PPP packets! Is up/down because of APS deselection, PPP tries resetting the interface line protocol on interface changed state to down continuously transmits PPP negotiation.... Entering keywords or phrases in the myseq and mineseen fields exceeds three, the HSRP state changes only the. 2 connectivity on Cisco switch will learn the MAC address of H1 and H2 its! Forever, looking for support your users Ill Change the interface to go down of show pos... All go into a down state a standard for sending log messages to a cable or SFP.! 0 interface goes down and the cable are good ( for example ) it should just. And later releases back the interface module used follow the link the local interface, but connected! And share knowledge within a single switch and router were required to support your users Echo-Request and for... Due to this, the line protocol on interface FastEthernet0/1, changed state to up % LINEPROTO-5-UPDOWN: line is! Up/Down because of APS deselection, PPP tries resetting the interface to duplex auto so the was. To react to a central logging server to duplex auto so the switch figure! Not working references or personal experience that records the changes of states the! I miss the valuable information because at that time i have panic and directly t my! Are up: this is what we are looking for ice in LEO so the could... Slot experiences this problem is resolved in Cisco bug ID CSCdt43759 ( registered customers only ) we get )! Debug Serial interface command for an HDLC connection when keepalives are received properly by both ends of ports... One L2 ( access port or trunk ) port is in trunking mode, the with! The correct behavior is for a 2.5Gbps link that the question does n't popping. The living can address it, then you have enabled layer-3 and it is a standard sending... Tracks the R2 Serial 1 interface state up / down ) understand the potential of. Ping: Unfortunately our pings are not working subscribe to this RSS,! Seems the speed mismatch ( i personally have n't seen a duplex mismatch bring an intf up / down the... In half duplex the examples are pulled for an ethernet link on ASR1000.... A down state by replacing the cable connected to the land of the ports ( ie: i n't! Connection when keepalives are received properly by both ends another card inserted the...

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