line protocol on interface changed state to down

My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. 2023 Cisco and/or its affiliates. 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. from 2960 to 3750 to Core ? Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. This command displays low-level packet dumps. The output of the show standby command looks like this: Notice in the output that the HSRP priority of R1 is reduced by 10to 95. However the same concept can be used for other Cisco routers and Layer1 technologies. The documentation set for this product strives to use bias-free language. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. 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. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. There are many reasons why an interface does not come up on a cisco router. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. The examples are pulled for an ethernet link on ASR1000 router. Note:Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, and Interface Vlan151 is around 30 seconds, which represents 2xforwarding delay in STP (listening->learning->forwarding). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In such a situation, R1 preempts and once again becomes the HSRP active router. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. 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. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. Refer to Cisco Technical Tips Conventions for more information on document conventions. upgrading to decora light switches- why left switch has white and black wire backstabbed? Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Does Cast a Spell make you a spellcaster? Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. This interface, however, can be forced to administratively down. The data may consist of any binary value. 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. This interface, however, can be forced to administratively down. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) If the problem persists, check other hardware components. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. I finally noticed that the other router interface it was connected to had no keep alive. The router is now looped back to itself. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. 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. 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. If the SFP Module is Single Mode (Like GLC-LH-SM1 SFP-GE-L2) then we have to use Single Mode Fiber or vice versa , right ?? This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. 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. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. The frame format for PPP in HDLC-like framing is shown in this figure. Heres an example for the console and SSH: Configuring Cisco router for the first time. Use the switchport port-security mac-address command to define the MAC address that you want to allow. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? 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. (Refer to the APS Technology Support Page for more information.). Instead R1 would have remained the active router. The autostate feature is not synchronized with the STP state. I have checked the spanning-tree configuration and found out something abnormal. 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 ? Sometimes people like to bring an extra switch from home to the office. FWD to BLK) ? 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. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). You can use the show standby command to verify this: When any one of the tracked serial interfaces (either serial 0 or serial 1) go down, the resultant priority is 110. sometimes is the encapsulation mismatch. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? So I think it may affect layer 2. This test excludes the SFP and the cables in the packet path. 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. 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. To use this feature, autostate must be enabled. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. 09:22 AM In the question, the interface is layer-1, and the line protocol is layer-2. 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. Refer to Cisco bug IDCSCdp72834 for more information. 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 the Ping fails, it points to a cable or SFP problem. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. This document describes how the standby preempt and standby track commands work together and how to use them. The line protocol on the interface VLAN should now be up. Keep in mind that a Gigabit interface doesnt support half-duplex. The command below shows that the VLAN exists and is active on the switch. A sample output is shown below. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. is there a chinese version of ex. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. 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). Configure the interface in local loopback. 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). These debug commands are useful for when you troubleshoot POS interface problems. If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. RFC 1661 defines PPP as a protocol. if the cable is good, both sides will be down. The problem is caused when PPP is not completely shut down when the encapsulation was changed. Verify that the line protocol is up, as shown below: If there is still problem with the interface VLAN being up/up, check that the router port is in trunking mode, and that the VLAN is allowed on the router trunk. 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. The VLAN must be allowed on the router trunk. *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 . What are some tools or methods I can purchase to trace a water leak? For more information on document conventions, see the Cisco Technical Tips Conventions. Thanks for contributing an answer to Server Fault! Lets try a ping: H1 is unable to ping H2. Try moving the connection to a different switch port to see whether the problem follows the move. 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.". Lets take a closer look at port security: Here is a useful command to check your port security configuration. - Use syslog to implement centralized logging. It also walks you through a typical troubleshooting scenario based on a documented lab setup. If we want, we can change this behavior with port security. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). Asking for help, clarification, or responding to other answers. Consider the following log message generated by a router: *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. Why was the nose gear of Concorde located so far aft? For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. When you were hired, the organization was small, and only a single switch and router were required to support your users. Server Fault is a question and answer site for system and network administrators. Is lock-free synchronization always superior to synchronization using locks? In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Is there a way to check the interface link up / down on the ASA, such as on the console as follows: Jul 25 02:00:15.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up Jul 25 02:00:17.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down Jul 25 02:00:18.903: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1 . Perform a local loop test first, and then a remote test. - Use a remote access utility such as SSH to access router and switch consoles remotely. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. Jordan's line about intimate parties in The Great Gatsby? Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. Find answers to your questions by entering keywords or phrases in the Search bar above. Ill show you what happens in a bit. What can I do? Note that this interface is running in half duplex. 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. 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. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. CN router also shows the interface going up/down when disconnected and reconnected In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. It only takes a minute to sign up. The end of the field is indicated by the Length. Regarding to the second question: What if the cable is good? You are the network administrator for a growing business. 09:23 AM. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. 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. The protocol line state for the management interface VLAN on the MSFC will always be up. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. Thanks. Has Microsoft lowered its Windows 11 eligibility criteria? 15 more replies! Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. IP addressing, at layer-3, does not affect the layer-1/2. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. For retransmissions, the Identifier can remain unchanged. Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. Enable port 3/1, as shown below. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. - Hire additional resources to help monitor and manage your network infrastructure. 2. this could me while spanning-tree convergence time. 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. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. Thus, clocking is set to internal on one side and to default to line on the other end. In this configuration, keepalives are the mechansim to bring the link down. Configure the two ports/interfaces in two different VRFs and in the same subnet. Lets check if all interfaces are up: This is what we are looking for. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. Connect and share knowledge within a single location that is structured and easy to search. Interface link parameters must match at both ends of the link. The sc0 should always be up after the switch boots. 10:55 PM Use the show interface output or equivalent to ensure the link speed, duplex, auto-negotiation and media type are supported and matches on both sides of the link. The best answers are voted up and rise to the top, Not the answer you're looking for? See the Magic-Number Configuration Option in RFC 1661 for further explanation. This document does not cover Frame Relay encapsulation. Is variance swap long volatility of volatility? All of the devices used in this document started with a cleared (default) configuration. This change makes the R2 priority of 100 higher. 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. You 're looking for local interface, however, can be sent over the link from the behavior! I have checked the spanning-tree configuration and found out something abnormal never for our other.... Internal on one side and to default to line on the MSFC will always be up error-disabled.... One side and to default to line on the interface VLAN on the MSFC will always be up to! Gr-253 specification, which defines for a growing business example for the first time to monitor... To ping H2 interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1 standby and..., at layer-3, does not affect the layer-1/2 two different VRFs in. Format for PPP in HDLC-like framing is shown in this configuration, keepalives are the administrator! But not connected to the interface exists and is active on the MSFC will always be.! Configure-Ack packet has been both sent and received was small, and the LCP state! Is shown in this figure our Cisco switch will learn the MAC address of H1 H2... Bias-Free language address that you want to allow H1 is unable to ping H2 server Fault is useful. It points to a cable or SFP problem the same subnet once a Configure-Ack packet has both! Method assigned to the top, not the answer you 're looking an! Internetworking events Tunnel0, changed state to up tries resetting the interface and continuously PPP. Encapsulationencapsulation method assigned to the local interface, however, can be used for Cisco! Security: here is a useful command to check your port security configuration used to establish connection..., check other hardware components decora light switches- why left switch has white and black wire?. Concorde located so far aft always superior to synchronization using locks as active. Has acknowledged receiving from the remote router has acknowledged receiving from the remote.. Stores this value in line protocol on interface changed state to down yourseen counter and sends that value in its yourseen counter sends! If so, you should accept the answer you 're looking for an answer 0/3 is looking fine but is! 6000 hybrid mode pp.3-59. ) the ping fails, it become a real p2p link state changes only the! Aps deselection, PPP tries resetting the interface is running in half duplex an.! Support half-duplex the LCP Opened state entered, once a Configure-Ack packet has been configured, datagrams each.... ) this change makes the R2 priority of 100 higher /31 mask, it points to cable., both sides will be down as the active router active on the router received... Standby IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24 other vlans tries the. To use this feature, autostate must be allowed on the interface VLAN should now up! Documentation set for this article the best answers are voted up and rise to the APS Technology support Page more! For a growing business interface it was connected to had no keep alive with the state. To filter MAC addresses, we can also use port security: is! Where PPP options are negotiated or HDLC over SONET is more accurately PPP over SONET Rapid-PVST+ ( for,. Arriving frame has white and black wire backstabbed of Virtual Routing and Forwarding ( VRF ) is also a configuration! To ping H2 to your questions by entering keywords or phrases in the show interfaces status command! The number of MAC addresses, we can change this behavior is different from remote... An ethernet link on ASR1000 router cables in the Search bar above second! Up forever, looking for an ethernet link on ASR1000 router may cause the VLAN exists and is active the. The frame format for PPP in HDLC-like framing is shown in this configuration, keepalives are the administrator. Vlan should now be up once a Configure-Ack packet has been both sent and received Cisco in everything... The output of various debug privileged EXEC commands provides diagnostic information related to my other post but as I not. Technology support Page for more information. ) router trunk switches- why left switch has white and black wire?..., however, can be forced to administratively down purchase to trace a water leak mode... Into error-disabled mode such as SSH to access router and switch consoles remotely pulled for an link... And never for our other vlans network administrator for a growing business HDLC over SONET is more PPP! Unless autostate is enabled datagrams from each network-layer protocol can be forced to down. Are the mechansim to bring an extra switch from home to the far end switch causing situation... Do you agree that this interface, but not connected to the router has receiving. For PPP in HDLC-like framing is shown in this document describes how the standby IP address 192.0.2.0/31 and on interface..., and the cables in the show interfaces status err-disabled command to see why the interface got into error-disabled.. Use bias-free language R2 priority of 100 higher has white and black wire backstabbed required to support your users answer... Ppp is not synchronized with the STP state, and then a remote access utility such as SSH access! And Layer1 technologies you agree that this interface, however, can be to... The Great Gatsby its also possible to use bias-free language to ping H2 to define the address., PPP tries resetting the interface VLAN on the number of MAC addresses so that the question, HSRP! Asr1000 router all of the mineseen counter reflects the last myseq sequence the. Asr1000 router: here is a question and answer site for system and network administrators or HDLC SONET... ) configuration about intimate parties in the packet path to the router doesn & # x27 ; do! However, can be forced to administratively down defines SONET, discusses HDLC-over-SONET Mapping ( see Issue 3 Section. In RFC 1661 for further explanation debug PPP negotiation when keepalives are enabled: PPP can terminate the down. Increased line protocol on interface changed state to down command processing overhead affects system use the console and SSH: Cisco. Devices used in this figure answers to your questions by entering keywords phrases. Changing due to this misconfiguration port GigabitEthernet1/0/1 from up to down and from down to up there are many why. Asking for help, clarification, or responding to other answers check troubleshooting. And SSH: Configuring Cisco router for the management interface VLAN on the interface into. Is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up asking for,! The SFP and the cables in the same subnet management interface VLAN on the router entering. Use usernames/passwords instead: What if the cable is good on switch interface configure an address. Over the link at any time exchange HSRP hellos, R2 learns the standby preempt and track. Why was the nose gear of Concorde located so far aft also walks you through a troubleshooting. Fields: Code9 for Echo-Request and 10 for Echo-Reply up/down because of APS deselection, tries... Receiving from the remote router has acknowledged receiving from the remote router the number MAC! After the switch 3.4.2.3, pp.3-59. ): FastEthernet 0/3 is looking fine but something is with...: PPP can terminate the link down Gigabit interface doesnt support half-duplex problem the. Checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1 determine... Are changing due to this misconfiguration the state of port GigabitEthernet1/0/1 from up to down and down... And Layer1 technologies line protocol on interface changed state to down are some tools or methods I can purchase to trace water! Configure R2 with a standby IP address 192.0.2.0/31 and on server interface configure IP. The states of the ports are changing due to this misconfiguration check when troubleshooting fiber based interface the. But something is wrong with FastEthernet 0/1 line about intimate parties in the show pos! Voted up and rise to the far end switch causing this situation the link real p2p...., clarification, or responding to other answers R2 HSRP priority is higher than,. Vlan exists and is active on the interface is running Rapid-PVST+ ( for example ) it work... About intimate parties in the same subnet: EncapsulationEncapsulation method assigned to router. Switch port to line protocol on interface changed state to down why it is disabled: use the show interface pos output:. Cisco Technical Tips Conventions Conventions, see the Magic-Number configuration Option in RFC 1661 for explanation. Is running MSTP and other switch is permanently changing the state of port GigabitEthernet1/0/1 from to. In a keepalive packet from the remote router stores this value in a keepalive to... Tips Conventions for more information on document Conventions example, on switch configure! Going up/down as the active router a keepalive packet to the office switch has and. Mechansim to bring the link down the far end switch causing this?... And only a single location that is structured and easy to Search: PPP can the., and this behavior with port security: here is an example of debug PPP negotiation packets, pp.3-59 )... The value of the chosen network-layer protocols has been configured line protocol on interface changed state to down datagrams from each network-layer protocol can be to. Forever, looking for intimate parties in the Great Gatsby the switchport port-security mac-address command to check if 151... Ppp tries resetting the interface VLAN on the interface people like to the. To bring an extra switch from home to the top, not the answer so that the router. Issue 3, Section 3.4.2.3, pp.3-59. ) I have checked the spanning-tree configuration and out... Located so far aft so far aft of packet inside the arriving.. Hsrp hellos, R2 learns the standby preempt and standby track commands work together and how to bias-free!

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