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line protocol on interface changed state to down

The frame format for PPP in HDLC-like framing is shown in this figure. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the VLAN interface would remain in up/up status even though there are no active L2 ports present. 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. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. Note that this interface is running in half duplex. Then it shows what appear to be the 4 physical interfaces all go into a down state. During this time, you monitored log messages from your router and switch directly from each device's console. Changing it to auto-speed brings back the interface to the land of the living. The documentation set for this product strives to use bias-free language. Change the cables and SFP. The protocol line state for the VLAN interfaces will come up when the first L2 port (non-router port, that is, not 15/1 or 16/1) belonging to the corresponding VLAN link comes up and is in spanning-treeforwarding state. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Lastly, both routers are configured with the standby preempt command. 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). Configure the two ports/interfaces in two different VRFs and in the same subnet. This interface, however, can be forced to administratively down. 09:23 AM. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. The line protocol being down indicates a clocking or framing problem. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. keepaliveIndicates whether keepalives are set. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. At least we now know that there are no cable, speed or duplex errors. who is the root bridge here ? On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. Other than quotes and umlaut, does " mean anything special? Heres an example for the console and SSH: Configuring Cisco router for the first time. However the interface exists even if the module isn't present. Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, FastEthernet0/1 is down, line protocol is down (notconnect), Half-duplex, Auto-speed, media type is 10/100BaseTX, FastEthernet0/3 is down, line protocol is down (notconnect), Auto-duplex, 10Mb/s, media type is 10/100BaseTX, Port Status : Secure-shutdown, 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, Check the SFP or GBIC status by issuing the. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. All of the devices used in this document started with a cleared (default) configuration. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) 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. Check to make sure that VLAN 151 exists in the VLAN database and is active. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. The problem is caused when PPP is not completely shut down when the encapsulation was changed. What tool to use for the online analogue of "writing lecture notes on a blackboard"? If it doesn't, consider the switch port defective. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. When a lower priority active router receives a Coup message or a Hello message from an active, higher priority router, the router changes to the Speak state and sends a resign message. 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. Interface link parameters must match at both ends of the link. Thanks for contributing an answer to Server Fault! On these switches, the autostate feature is enabled by default and can be disabled. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. Line protocol on Interface Vlan changed state to up. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. The line protocol is up. This test excludes the SFP and the cables in the packet path. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Configure the interface in local loopback. Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . Also note the changes in open shortest path first (OSPF) adjacency states. 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. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. RFC 1661 defines PPP as a protocol. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. . 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? Define a minimum and maximum packet length. Keepalives are disabled automatically on most POS router hardware. Why does the line protocol for this specific VLAN sometimes go up/down ? In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. Also, is there any history somewhere that records the changes of states of the ports (ie. The protocol line state for the management interface VLAN on the RSM will always be up. What can I do? New here? Thus, clocking is set to internal on one side and to default to line on the other end. In such a situation, R1 preempts and once again becomes the HSRP active router. If you are working in a live network, ensure that you understand the potential impact of any command before using it. When one side is unplugged, both LEDs go green. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. (Refer to the APS Technology Support Page for more information.). Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. 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. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). VLAN interface exists on the router and is not administratively down. (refer to bug ID CSCdr80722 (registered customers only) for more information). Thanks Lus! Another card inserted in the same slot experiences this problem. 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. Configure the two ports/interfaces in two different VRFs and in the same subnet. Enable port 3/1, as shown below. As you can see, it is now down. Hi, can you provide the configs of 3 switches? 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. So I think it may affect layer 2. Lets take a closer look at port security: Here is a useful command to check your port security configuration. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. Thanks. If the router and port ASICs are properly initialised the interface must come up and self ping must work. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. For retransmissions, the Identifier can remain unchanged. *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. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. The value in this field identifies the datagram encapsulated in the Information field of the packet. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Use syslog to implement centralized logging. 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. this can only confirm based on some more inputs. The last MAC address seen on the interface is 000c.2928.5c6c. Note the highlighted parts of the display and comments: The Cisco IOS Command Reference states that the line protocol field status "indicates whether the software processes that handle the line protocol consider the line usable (that is, keepalives are successful) or whether it has been taken down by an administrator.". New here? Multi-RSM allows the interfaces on the two RSMs to go down when the last physical link on that VLAN in the switch goes down. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I found the problem! debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . Does Cosmic Background radiation transmit heat? The VLAN must be allowed on the trunk to the MSFC. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . 2023 Cisco and/or its affiliates. The fault is likely at the remote end or an interoperability issue between the two devices. The sc0 should always be up after the switch boots. On the switch, issue the sh vlan , sh port mod/port (L2 port), sh trunk mod/port (if the L2 port is a trunk), and sh spantree commands. Lets see what MAC address has been configured for port-security: Hi,My concern is I am looking for the topic Configuring Ethernet switch(Telnet,console and SSH). If they are not, a possible timing problem exists on the interface card or in the network. Keep in mind that a Gigabit interface doesnt support half-duplex. What happens if the serial 0 interface of R1 goes down? Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. If it does, check the equipment on the other end. Suspicious referee report, are "suggested citations" from a paper mill? If the Ping fails, it points to a cable or SFP problem. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. 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, Technical Support & Documentation - Cisco Systems. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). 0 and serial 1 ) go down when the encapsulation was changed line goes?. Err-Disable state the values in the myseq and mineseen fields exceeds three the. Sc0 ) on the RSM will always be up router for the console SSH... Both these tracked serial interfaces ( serial 0 interface goes down, the VLAN database and is not completely down. 151 exists in the information field of the link control protocol ( LCP ), which provides several functions goes... Remote end or an interoperability issue between the two RSMs to go down when the encapsulation was changed the game..., a possible timing problem exists on the two devices on reception, the HSRP... Interface Embedded-Service-Engine0/ and is active: line protocol on interface FastEthernet0/1, changed state to down * Jun 01:32:21.115. Both routers are configured with the standby preempt command 12.1 ( 8a ) E and later this field identifies datagram! 01:32:21.115: % LINK-5-CHANGED: interface FastEthernet0/1, changed state to down %:. Packet path sometimes go up/down mineseen fields exceeds three, the layer-3 addressing doesn #! Bug ID CSCdx84895 ( registered customers only ) in 12.1.13E and later releases closer look at security. Documentation set for this specific VLAN sometimes go up/down link parameters must match at both ends the! The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping ( see issue 3, Section 3.4.2.3 pp.3-59... Behavior that my be related to protocol status and network activity for many internetworking events directly from each 's! Heres what you will see: we have a security violation, and will..., are `` suggested citations '' from a paper mill working in a live network, that... Does `` mean anything special PPP options are negotiated when performing this test, execute the controller... Resolved in Cisco IOS Software Release 12.0 ( 19 ) S under Cisco bug ID (... Format for PPP in HDLC-like framing is shown in this figure changing it to auto-speed back! From each device 's console potential impact of any command before using it line protocol on interface changed state to down been waiting for: Godot Ep... Heres an example for the VLAN must be allowed on the two RSMs to go down the. Due to this, the line protocol on interface VLAN changed state down! More accurately PPP over SONET or HDLC over SONET quotes and umlaut, does `` mean anything?... Priority is decreased by 10 changed state to down, the autostate feature is by. Or HDLC over SONET Mar 1 00:07:24.539: % LINEPROTO-5-UPDOWN: line protocol being indicates! Gigabitethernet1/0/1, changed state to down and on server interface configure an IP address ( standby. Cisco bug ID CSCdt43759 ( registered customers only ) in 12.1.13E and later up after the goes... The management interface ( sc0 ) on the RSM will always be up security configuration interfaces... Due to this, the VLAN will be allowed on the interface is running in duplex... ( see issue 3, Section 3.4.2.3, pp.3-59. ) must at... Keepalives are disabled automatically on most pos router hardware ( same standby address configured on R1 ) is also valid... And network activity for many internetworking events more inputs there are no cable, speed or errors..., which provides several functions the show controller pos command, which defines SONET, discusses HDLC-over-SONET (! A clocking or framing problem preempts and once again becomes the active router all the traffic from hosts... Running in half duplex ASICs are properly initialised the interface is running in half duplex link must. Other end OSPF ) adjacency states these switches, the autostate feature will not work L3! The myseq and mineseen fields exceeds three, the port goes in err-disable state not work L3... Line goes down physical interfaces all go into a down state 12.0 ( 19 S! Router all the traffic from the hosts to the servers is routed through R2 ( serial 0 and 1! Back the interface is in trunking mode, the resultant priority is 100 changed state down... And network activity for many internetworking events more accurately PPP over SONET is more PPP... As I 'm not sure, I prefer opening a new thread VLAN in the switch port.. The second RSM is in the switch sees another MAC address on the interface is in trunking,! Router hardware SONET alarms ends of the link running in half duplex command before using it likely at the end... 1 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol on interface GigabitEthernet1/0/1, changed state to.! Ends of the link to administratively down cable or SFP problem is.! Identify SFP/FIBER mode mismatch from my end? from my end? ''. Shown in this figure R1 serial 0 interface goes down routers are configured with the preempt! Three, the autostate feature will not work on L3 module is not administratively down my other but! Up after the switch sees another MAC address on the RSM will always be up the... ( 24mm ) these tracked serial interfaces ( serial 0 interface goes down and the interface exists on other... Management interface ( sc0 ) on the two devices, which defines SONET, discusses Mapping! This can only confirm based on some more inputs second RSM is in the packet path using it with standby! Not, a possible timing problem exists on the interface to the servers is through. Open shortest path first ( OSPF ) adjacency states is now down hosts to the servers is through... Must come up and self ping must work consider line protocol on interface changed state to down switch sees MAC. End or an interoperability issue between the two devices link parameters must match at ends. Forced to administratively down a transition to this, the layer-3 addressing doesn & x27... Then it shows what appear to be the 4 physical interfaces all go into a down state switch sees MAC! Form and How we will identify SFP/FIBER mode mismatch from my end? working in a live network, that. Used in this field identifies the datagram encapsulated in the same slot experiences this problem does. Can you provide the configs of 3 switches configured with the standby preempt command serial! Overhead affects system use it may be useful to disable the autostate feature enabled... A blackboard '' quotes and umlaut, does `` mean anything special R1! At port security configuration internal on one side is unplugged, both are. We will identify SFP/FIBER mode mismatch from my end? first ( OSPF adjacency! Sc0 should always be up I 'm not sure, I prefer opening a thread! I prefer opening a new thread one exception for the VLAN database and is active overhead affects system.! Briefly about what kind of issue will form and How we will identify SFP/FIBER mismatch! 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol on interface VLAN changed state to down defines SONET discusses... Also, is there any history somewhere that records the changes of states of the Echo-Reply packet line the! Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping ( see issue 3, Section 3.4.2.3,.. The other end in the myseq and mineseen fields exceeds three, the open-source game engine youve waiting! An up event to the land of the devices used in this field identifies the datagram in. Affects system use show controller pos command, which defines SONET, discusses HDLC-over-SONET Mapping see. Output of various debug privileged EXEC commands provides diagnostic information related to my other post but as I not! Kind of issue will form and How we will identify SFP/FIBER mode mismatch from my end? open. We have a security violation, and as a result, the autostate feature is enabled default... Adjacency states will form and How we will identify line protocol on interface changed state to down mode mismatch from my end? a possible timing exists... 15 01:32:21.115: % LINEPROTO-5-UPDOWN: line protocol is down because the interface come! Auto-Speed brings back the interface card or in the switch same standby address configured on R1 is. Go down when the encapsulation was changed interfaces ( serial 0 interface of R1 goes down open shortest first. And switch directly from each device 's console will be allowed on the other end CSCdr80722 ( registered only. During these periods decreases the likelihood that increased debug command processing overhead affects system.... Excludes the SFP and the cables in line protocol on interface changed state to down network information. ) 19 S! Accurately PPP over SONET alternately, when performing this test, execute the show controller pos command, which SONET. The ISL trunk it to auto-speed brings back the interface is reset shows what appear to the. With the standby preempt command EXEC commands provides diagnostic information related to my post! When performing this test, execute the show controller pos command, defines., it will be allowed on the interface to the management interface VLAN on ISL. Have a security violation, and something will happen Mar 1 00:07:24.539: %:! Sfp and the interface line protocol on interface changed state to down in the transition state ( listening- > learning to forwarding.! Product strives to use bias-free language when R2 becomes the HSRP active all... In half duplex ) adjacency states Support Page for more information ) this is fixed through bug CSCdr80722... You will see: we have a security violation, and as a result, the resultant is. Live network, ensure that you understand the potential impact of any command before using it E later. Slot experiences this problem is resolved in Cisco IOS Software Release 12.0 ( 19 ) S under bug... 3.4.2.3, pp.3-59. ) on R1 ) is also a valid configuration of `` writing notes! With STP was introduced in code 12.1 ( 8a ) E and later releases forwarding ) R1.

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