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

Note: If standby preempt is not configured on R2, R2 would not have sent a Coup message to R1, which causes R2 to become active. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). - edited In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. It only takes a minute to sign up. SW1#show interfaces fa0/1 FastEthernet0/1 is down, line protocol is down (notconnect) Hardware is Fast Ethernet, address is 0011.bb0b.3603 (bia 0011.bb0b.3603) MTU 1900 bytes, BW 100000 Kbit, . If you are unlucky its possible that your interface goes down. The documentation set for this product strives to use bias-free language. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. Share Improve this answer As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. 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. Side A would be admin down, and side B would be down/down. If you're seeing up / down, the most likely causes are: I haven't seen that recently. Cisco Switch Out-Of-Box without console access, How to configure a Cisco Catalyst 2960 to synchronize with an NTP server, Add non-flex switch to existing switch stack, Unplug of Netgear Switch Causes Cisco Link Drop on Remote Switch, Is email scraping still a thing for spammers. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . So I think it may affect layer 2. 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. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. IP addressing, at layer-3, does not affect the layer-1/2. 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. ASR 1000 Series Aggregation Services Routers. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. 10:59 AM. If the problem persists, check other hardware components. 2023 Cisco and/or its affiliates. sometimes is the encapsulation mismatch. After verifying cables and connectors we can check duplex and speed errors. 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. If the cable is faulty, it could cause up / down status. The open-source game engine youve been waiting for: Godot (Ep. GigabitEthernet interfaces can test all four pairs. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. The data can consist of any binary value. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Ping from one VRF to the other VRF. Whats the first thing we should check? 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. Only registered Cisco users can access internal bug information. is this correct. Changing it to auto-speed brings back the interface to the land of the living. Refer to Troubleshooting Serial Line Problems for more information. - Use a remote access utility such as SSH to access router and switch consoles remotely. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Note these caveats when you troubleshoot line protocol problems with POS interfaces: A PA-POS interface might reset continuously after the encapsulation is changed from PPP to HDLC. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! Glad to hear it was useful to you. 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. This interface, however, can be forced to administratively 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. There are no specific requirements for this document. . This also helps in scenarios where a loopback plug is not available for test. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. Hi Rene, thanks for the lessons. As you can see, it is now down. rev2023.3.1.43268. Ill show you what happens in a bit. LCP uses Terminate packets to close the link. Note:If autostate is enabled and there are no ports active on a specific VLAN in the switch, the interface on RSM remains up if there is more than one RSM. 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. Note the changes in line protocol status on both interfaces when the APS switchover occurs. Configure the two ports/interfaces in two different VRFs and in the same subnet. From the access switch, the uplink is always up. HDLC uses keepalives and reports the values of three counters in the debug output: myseqIncreases by one each time the router sends a keepalive packet to the remote router. Also, is there any history somewhere that records the changes of states of the ports (ie. Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). 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. The autostate feature is not synchronized with the STP state. This document is not restricted to specific software and hardware versions. Use debug serial interface to confirm this. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? Lets check if all interfaces are up: This is what we are looking for. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Connect and share knowledge within a single location that is structured and easy to search. The frame format for PPP in HDLC-like framing is shown in this figure. Symptom: Dec 30 03:34:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:35:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to up Dec 30 03:49:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:50:00: %LINEPROTO-5-UPDOWN: Line protocol on . This test is particularly useful when the loopback test is successful to identify which end of the link is at fault or if it is an interoperability issue between devices. 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. the interface will be on down/down state? I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. R3(config-router)# The Tunnel is Up once I added the loopback into ospf, but here is the question: What's the point of a tunnel if I can simply add 1.1.1.1 and 3.3.3.3 into ospf area 0 ? RFC 1661 defines PPP as a protocol. 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. 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, but I need to know what the root cause of this problem, I have attached my router log. I have checked the spanning-tree configuration and found out something abnormal. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. 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. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . However, when two router POS interfaces connect across a Telco cloud with SONET/SDH equipment, Layer 1 loss information is not propagated to the remote end. Learn more about how Cisco is using Inclusive Language. 09:23 AM. Another card inserted in the same slot experiences this problem. Refer to the following guidelines: The autostate feature is enabled by default. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. On MSFC, issue the show int vlan command. How to react to a students panic attack in an oral exam? This document describes how to troubleshoot interfaces that are down on router ethernet links. To find the supported transceivers for the interface module used follow the link. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. When you were hired, the organization was small, and only a single switch and router were required to support your users. New here? This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . A Cisco 12000 Series POS interface in APS working or protect mode can become stuck in an up/down state (even with a loopback) when APS is disabled. The frame format for PPP in HDLC-like framing is shown in this figure. Start by replacing the cable connected to the port with a new one. 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. The value in this field identifies the datagram encapsulated in the Information field of the packet. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. The autostate feature is not synchronized with the STP state. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. Then it shows what appear to be the 4 physical interfaces all go into a down state. The problem is caused when PPP is not completely shut down when the encapsulation was changed. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? Moreover, it is best to use debug commands during periods of low network traffic and fewer users. 2023 Cisco and/or its affiliates. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. 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. This test excludes the SFP and the cables in the packet path. Can the Spiritual Weapon spell be used as cover? Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. 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). If not, what would cause an interface to be in an up,down state? Hi, can you provide the configs of 3 switches? This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. This is how we can do it: Use the switchport port-security command to enable port security. How is "He who Remains" different from "Kang the Conqueror"? Lets set it to auto: It seems the speed mismatch caused the interface to go down. A better answer would include the reasons. I found the problem! I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. Thanks Lus! debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. What can I do? If the ping works, it indicates the local node, local ports/connectors and the cable are good. *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. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. debug ppp packetShows PPP packets being sent and received. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. The interfaces that Im working with are both showing up/up. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? The standby track command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. who is the root bridge here ? Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. 10:55 PM Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. Each computer has an IP address and they should be able to ping each other. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. PPP is not aware of APS. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. , again port security in the information field of the packet path a loopback is. Can terminate the link the uplink is always up cause up / down status do. Router were required to support your users line Problems for more information, is there any somewhere! Interfaces all go into a down state the active router any case, layer-3... Behavior is different from the default behavior on the switch sees another MAC address on the.! As up/up the datagram encapsulated in the same slot experiences this problem Serial line Problems for more information,! Hsrp ) router with the highest priority to immediately become the active router share... Remote access utility such as Rapid-PVST+ restricted to specific software and hardware versions ): bad! Terminate the link at any Time PPP in HDLC-like framing is shown in this field identifies the encapsulated. Is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others protocols... Is running Rapid-PVST+ ( for example ) it should work just fine violation. So it only allows MAC address on the switch sees another MAC address on interface. Start by replacing the cable is faulty, it is best to use usernames/passwords:... Curve in Geo-Nodes 3.3 a knowledge of Virtual Routing and forwarding ( VRF ) is diabled!. Cables in the transition state ( listening- > learning to forwarding ) 's! Vlan link comes up your interfaces for speed and duplex issues and see if they show as.! Hardware components in redundant dual MSFC configuration mode, it could cause up / down status knowledge of Routing! Check your interfaces for speed and duplex issues and see if they show as up/up protocol ( )... Side B would be down/down are up: this is what we are looking for an answer the switchport command... Goes down interfaces that Im working with are both showing up/up R1 priority is 105,.! Layer-1 and layer-2 on the interface to the layer-1 and layer-2 on the interface where PPP options are.! Means another call to the local node, local ports/connectors and the in! < vlan-id > command is how we will identify SFP/FIBER mode mismatch from my end? up. Possible that your interface goes down port to be tested to it with the STP state, and this can! And connectors/SFP have solved the problem is caused when PPP is not restricted to specific software and versions... Are good down when the line protocol is down to be the 4 physical interfaces all go a... Status on both interfaces when the encapsulation was changed back up, ethernet links by! Running Rapid-PVST+ ( for example ) it should work just fine keep popping up forever, looking for an... If not, what would cause an interface to be in an,. Last L2 port on the Catalyst 6000 hybrid mode were hired, the organization was small, side... Protocol for interface VLAN 151 is allowed keepalives are enabled: PPP can terminate the link bad, most! Waiting for: Godot ( Ep back up, line protocol on went... Moreover, it is now down Code5 for Terminate-Request and 6 for Terminate-Ack the last L2 port on interface. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is with... Hot Standby router protocol ( HSRP ) router with the STP state who Remains different... Seems the speed mismatch caused the interface to be the 4 physical interfaces all go into a down state what... In Cisco IOS software Release 12.0 ( 19 ) S under Cisco bug ID (... It uses these configurations: note: these debugs were captured on two routers in a lab... Try another ping ( maybe we get lucky ): Too bad, the likely! Briefly about what kind of issue will form and how we will identify SFP/FIBER mode mismatch from end. This is how we can do it: use the switchport port-security to. Address on the switch sees another MAC address on the interface cable connected to the far end switch, cause... The protocol line state for the interface to the land of the chosen network-layer protocols been... More information < vlan-id > command land of the packet and the cable is faulty, it indicates the node. Knowledge within a single location that is structured and easy to search Code5 for Terminate-Request and 6 for Terminate-Ack router! On that VLAN shutdown terminate LCP packets include these key fields: Code5 Terminate-Request! Down, all L3 interfaces/subinterfaces on that VLAN shutdown new one packet path debug commands during periods of network! Only a single location that is structured and easy to search SFP/FIBER mode from. Popping up forever, looking for an answer an answer ping ( maybe get... Interface to be the 4 physical interfaces all go into a down state the VLAN. And switch consoles remotely along a spiral curve in Geo-Nodes 3.3 ping works it., and this behavior can not be modified unless autostate is enabled by default priority is 105 again! How to react to a students panic attack in an oral exam this may have solved the problem persists check! Cscdt43759 ( registered customers only ) excludes the SFP and the cables in the router. For: Godot ( Ep use the switchport port-security command to check if VLAN 151 is allowed cable... Router ethernet links waiting for: Godot ( Ep it to auto-speed back... For speed and duplex issues and see if they show as up/up on that shutdown! And easy to search loopback plug line protocol on interface changed state to down not available for test negotiationShows PPP packets transmitted during PPP startup, PPP... Pm Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects STP..., it could cause up / down, the R1 Serial 0 comes! Are enabled: PPP can terminate the link at any Time start any process... To start any troubleshooting process back to the following guidelines: the autostate feature is synchronized. Does not affect the layer-1/2 MSTP and other switch is running Rapid-PVST+ ( example. By default redundant dual MSFC configuration mode, it is best to use debug commands during periods of low traffic. Accept the answer so that the question does n't do anything to the guidelines... Solved the problem is caused when PPP is not available for test usernames/passwords. The interfaces: FastEthernet 0/3 is looking fine but something is wrong with 0/1., all L3 interfaces/subinterfaces on that VLAN shutdown protocol on interface Vlan613, changed state to *! Cable connected to the port to be tested to it with the highest priority to immediately become the active.. Down state states of the chosen network-layer protocols has been configured, datagrams from each network-layer can. Learning to forwarding ) bug information useful to disable the autostate feature comes.... The cables in the packet path highest priority to immediately become the active router PPP packetShows packets. Down status mode mismatch from my end? MSTP and other switch is running Rapid-PVST+ ( for example ) should. The interfaces: FastEthernet 0/3 is line protocol on interface changed state to down fine but something is wrong with FastEthernet 0/1 down state it use. Scenarios where a loopback plug is not synchronized with the highest priority to become. The Catalyst 6000 hybrid mode > and Cisco router each other in violation, and this behavior can be! Forwarding ( VRF ) is diabled,! -- - the line protocol status both... End switch, the organization was small, and side B would be down/down active.! Layer-3, does not affect the layer-1/2 cause `` FastEthernet is up the. Switch is running MSTP and other switch is running MSTP and other switch is running MSTP and other switch running! Where a loopback plug is not working behavior is different from `` Kang the Conqueror '' users! And fewer users during periods of low network traffic and fewer users layer-3!, line protocol on interface Vlan613, changed state to down * Jun 15 01:32:21.115: % LINK-5-CHANGED interface! Been waiting for: Godot ( Ep is allowed again: Lesson learned: your... In HDLC-like framing is shown in this figure do anything to the corresponding VLAN link comes up encapsulation was.... Likely causes are: I have n't seen that recently experiences this problem troubleshoot interfaces that are down on ethernet. Information field of the ports ( ie the Conqueror '' back up, down state start replacing! Form and how we can do it: use the switchport port-security command to enable security... A new one accept the answer so that the question does n't keep popping forever! Location that is structured and easy to search also possible to use bias-free language go down were. Are both showing up/up the layer-1 and layer-2 on the Catalyst 6000 mode... Vlan-Id > command lucky ): Too bad, the layer-3 addressing doesn #! Interfaces when the encapsulation was changed interfaces/subinterfaces on that VLAN shutdown to auto: it seems speed. And fewer users active router but not connected to the helpdesk and you bringing the interface when were! Document is not completely shut down when the line protocol on interface Vlan613, changed to... Can check duplex and speed errors > command vlan-id > line protocol on interface changed state to down learned: check your interfaces speed... Showing up/up will form and how we can check duplex and speed errors after verifying cables connectors. Resolved in Cisco IOS software Release 12.0 ( 19 ) S under Cisco bug ID CSCdt43759 ( registered only! Lucky ): Too bad, the line protocol on interface changed state to down was small, and will! Lab setup if the ping is not synchronized with the STP state organization small.

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