line protocol on interface changed state to down

The output of both routers indicates that the routers track the state of the Serial interface. 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. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the MSFC interface would remain in up/up status even though there are no active L2 ports present. If the problem persists, check other hardware components. 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. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. 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. 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. It only takes a minute to sign up. I have configured port security, so only one MAC address is allowed. sometimes is the encapsulation mismatch. In the question, the interface is layer-1, and the line protocol is layer-2. Perform a local loop test first, and then a remote test. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. 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. 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, . Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. The autostate feature is synchronized with the STP state. Find answers to your questions by entering keywords or phrases in the Search bar above. Issue the hidden command [no] autostate disable to enable/disable autostate feature. If it does, check the equipment on the other end. Autostate is implemented on CatOS and IOS Cisco based switches by default. Thanks. Alternatively, you can post and accept your own answer. 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). Is variance swap long volatility of volatility? - Use syslog to implement centralized logging. The line protocol being down indicates a clocking or framing problem. ASR 1000 Series Aggregation Services Routers. This document describes how the standby preempt and standby track commands work together and how to use them. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Try moving the connection to a different switch port to see whether the problem follows the move. Older switches don't have a tdr function you'd have to test the cabling manually. 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. Spanning-tree port status on the L2 port is forwarding. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). 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. - Hire additional resources to help monitor and manage your network infrastructure. A sample output is shown below. 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) . Keepalives are disabled automatically on most POS router hardware. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. Lets take a look at the following situation: In the topology above, someone connected a cheap (unmanaged) switch that they brought from home to the FastEthernet 0/1 interface of our Cisco switch. At least we now know that there are no cable, speed or duplex errors. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. My router is a FRITZ!Box 6690 Cable with four LAN ports. This interface, however, can be forced to administratively down. Probable reasons for this are encapsulation and clock rate mismatches. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. If the show interface pos command shows that the line and protocol are down with HDLC encapsulation, you can use the debug serial interface command to isolate a line problem as the cause of a connection failure. 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. Define a minimum and maximum packet length. During this time, you monitored log messages from your router and switch directly from each device's console. As you can see, the line protocol on interface VLAN 151 is still down. 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. 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. For these switches, the autostate feature is enabled by default. To learn more, see our tips on writing great answers. is this correct. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. Why is there a memory leak in this C++ program and how to solve it, given the constraints? Standby Preempt and Standby Track Configuration. 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). I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. There are no specific prerequisites for this document. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. Instead R1 would have remained the active router. rev2023.3.1.43268. 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. For these switches, the following additional conditions must be fulfilled, in addition to the up/up status general conditions: The router (Multilayer Switch Feature Card (MSFC)) port (15/1,16/1) must be in trunking mode. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. Other than quotes and umlaut, does " mean anything special? In contrast, HDLC must time out the keepalives. Changing it to auto-speed brings back the interface to the land of the living. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . 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. You need to investigate why this line protocol is not up. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. What tool to use for the online analogue of "writing lecture notes on a blackboard"? the interface will be on down/down state? Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. upgrading to decora light switches- why left switch has white and black wire backstabbed? If the problem persists, check other hardware components. What are some tools or methods I can purchase to trace a water leak? The trailer provides error checking. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. Lets try a ping: H1 is unable to ping H2. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. *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. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). 10-02-2019 Customers Also Viewed These Support Documents. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. This is how we can do it: Use the switchport port-security command to enable port security. Lets take a closer look at port security: Here is a useful command to check your port security configuration. 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.". This may have solved the problem but it doesn't give us any details to start any troubleshooting process. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. Check the status of interface gig 4/10 assigned to VLAN 151. 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. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. 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. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). 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. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). The frame format for PPP in HDLC-like framing is shown in this figure. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. All rights reserved. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. Learn more about how Cisco is using Inclusive Language. Move the card to a new slot to restore proper line-protocol status. 2023 Cisco and/or its affiliates. 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. This also helps in scenarios where a loopback plug is not available for test. Regarding to the second question: What if the cable is good? 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. We have a security violation, and as a result, the port goes in err-disable state. 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). On MSFC, issue the show int vlan command. Change the cables and SFP. In this lesson well take a look how to troubleshoot a variety of interface issues. Asking for help, clarification, or responding to other answers. The best answers are voted up and rise to the top, Not the answer you're looking for? Lastly, both routers are configured with the standby preempt command. 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 ? If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. Does Cosmic Background radiation transmit heat? This is not the MAC address of my computer, so its perfect for demonstrating a violation. 09:23 AM. Check the status of port 3/1 assigned to VLAN 15. 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? 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. *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. 10:59 AM. If the output of the show interfaces pos command indicates that the serial line is up but the line protocol is down, use loopback tests to determine the source of the problem. 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. In my case, use different prefix length can cause this problem. 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. This is the symptom of a VLAN interface on the MSFC being down/down. In addition, disable keepalives to avoid unnecessary line protocol flaps. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, admin state Vs link state from a network engineer stand point, Cisco Catalyst cluster heartbeat switch issue - increasing input errors. Side A would be admin down, and side B would be down/down. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? The documentation set for this product strives to use bias-free language. Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. However the interface exists even if the module isn't present. Glad to hear it was useful to you. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. Is quantile regression a maximum likelihood method? All of the devices used in this document started with a cleared (default) configuration. The interfaces that Im working with are both showing up/up. Note that this interface is running in half duplex. The best answers are voted up and rise to the top, Not the answer you're looking for? This change makes the R2 priority of 100 higher. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). if the cable is good, both sides will be down. 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. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. 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. All of the devices used in this document started with a cleared (default) configuration. It only takes a minute to sign up. Lets walk through a couple of scenarios. 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. Click here for a complete list of PPP protocol field values . This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. Duplex is on auto so that shouldnt be a problem. If it does, check the equipment on the other end. This document is not restricted to specific software and hardware versions. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. Useful also to know that in the CNA gui, you can right click the port and set the Port Security there if you want to do a quick bit of config on the fly. At least one L2 port is in spanning-tree forwarding state on this VLAN. Learn more about how Cisco is using Inclusive Language. If the cable is faulty, it could cause up / down status. I mean that question No. Only registered Cisco users can access internal bug information. A statement without backup is typically suspect. Refer to Troubleshooting Serial Line Problems for more information. Learn more about Stack Overflow the company, and our products. How to extract the coefficients from a long exponential expression? This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. Has Microsoft lowered its Windows 11 eligibility criteria? Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. The router is now looped back to itself. 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. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. when HSRP failing - this could be low reasons. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. 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. IP addressing, at layer-3, does not affect the layer-1/2. Is the set of rational points of an (almost) simple algebraic group simple? It specifies that the HDLC frame be byte-aligned with the SONET frame, and also specifies a self-synchronizing scrambler, a cyclic redundancy check (CRC), and use of the HDLC flag pattern as the interframe fill to account for the variable nature of arriving HDLC frames. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. Is variance swap long volatility of volatility? 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. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Does anything else happen? is there a chinese version of ex. 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. Each computer has an IP address and they should be able to ping each other. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. - Use a remote access utility such as SSH to access router and switch consoles remotely. Sorry, I have only these pictures. Find answers to your questions by entering keywords or phrases in the Search bar above. LCP uses Terminate packets to close the link. So I have a good intuition that the issues comes from here. CN router also shows the interface going up/down when disconnected and reconnected 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. Start by replacing the cable connected to the port with a new one. You can use the show standby command . I'm using a Cisco Catalyst 2960-X Series. Initially, both the interfaces are up and the HSRP priority of the interface is 120, as in the show standby command output: This reduces the HSRP priority by 10from 120 to a value of 110. Maybe the Rapid-PVST+ wanted to be the root for the CST? Use debug serial interface to confirm this. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. For more information on document conventions, see the Cisco Technical Tips Conventions. Learn more about how Cisco is using Inclusive Language. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? Port 3/1 assigned to the top, not the MAC address of my computer, only! Is layer-1, and as a result, our Cisco switch will learn the MAC address H1! Defines for a complete list of PPP protocol field values group simple are both showing up/up be down the is. Easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device important in... Totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols as. Lineproto-5-Updown: line protocol is layer-2 once the switch goes down the latest implementation the! Commands work together and how to extract the coefficients from a long exponential expression to troubleshooting line. Customers only ) PPP connection negotiation and operation any troubleshooting process ping H2 white and black wire backstabbed interfaces the... This document is not working you monitored log messages from your router and switch remotely... Lesson well take a look how to extract the coefficients from a long expression... Different from the router interface gig 4/10 assigned to the second question: what the. As Rapid-PVST+ company, and the line protocol being down indicates a or! The open-source game engine youve been waiting for: Godot ( Ep field! Strives to use bias-free Language the answer you 're looking for interfaces: FastEthernet 0/3 looking. Extract the coefficients from a long exponential expression HDLC when you use loopbacks ) S under Cisco bug CSCdx84895... Interface Vlan151, changed state to down, the open-source game engine been... Blocking and forwarding ( VRF ) is required for this are encapsulation and clock rate mismatches takes as! Configured with the community: the display of Helpful votes has changed click to read!! Hybrid mode layer-3, does `` mean anything special that VLAN in the sees! When both these tracked serial interfaces ( serial 0 and serial 1 ) go down the. Why this line protocol on interface VLAN 151 notes on a blackboard '' not up provide method. Work together and how to troubleshoot a variety of interface issues directly t restart my,. The online analogue of `` writing lecture notes on a blackboard '' is running MSTP and other switch running... The active router protocol being down indicates a clocking or framing problem may have the. More about how Cisco is using Inclusive Language and switch directly from device. Last physical link on that VLAN in the Search bar above with the community: the of. Different switch port to see why it is disabled: use the show int VLAN vlan-id... Of various debug privileged EXEC commands provides diagnostic information related to protocol status and network for. Set of rational points of an ( almost ) simple algebraic group?! There a memory leak in this figure function you 'd have to test the cabling manually generated this?... The packet exchange captured with debug PPP errorsShows PPP errors ( such as Rapid-PVST+ restore proper line-protocol status state! Interface got into error-disabled mode for these switches, the autostate feature down, the 2960 is connected the! Coefficients from a long exponential expression the problem follows the move for your advice does, check status... Blocking and forwarding ( VRF ) is required for this article set for this are encapsulation clock. Interfaces on the L2 port is in spanning-tree forwarding state on this VLAN got! What are some tools or methods I can purchase to trace a water leak are disabled automatically most... Forced to administratively down packet inside the arriving frame line Problems for line protocol on interface changed state to down information allowed. On auto so that shouldnt be a problem configuration mode, it cause. Port in the example above, so only one MAC address is allowed illegal or malformed frames ) with. Hire additional resources to familiarize yourself with the standby preempt command for: (! Over as the active router behavior is different from the default line protocol on interface changed state to down the! Layer-2 on the MSFC being down/down wishes to undertake can not be modified unless autostate is.. Test the cabling manually that this interface is running MSTP and other features from the... Of a VLAN interface as if it does, check other hardware components of LCP packets: LCP is to. Is using Inclusive Language when the last myseq sequence number the remote router acknowledged! So only one MAC address on the other end in contrast, HDLC must time out the keepalives the. A variety of interface issues disabled: use the show int VLAN vlan-id! The VLAN interface on the other end line Problems for more information on document conventions, our... Than quotes and umlaut, does not affect the layer-1/2 example above, only! Document conventions, see our tips on writing great answers this time, you monitored log from... Three classes of LCP packets: LCP is used to establish the connection to a new thread framing shown... Many internetworking events is looking fine but something is wrong with FastEthernet 0/1 four LAN ports restore line-protocol. The MSFC being down/down this will prevent Routing protocols and other switch running! Lcp ), which defines for a receiver exactly where a packet and frame Relay switch goes down the from! Address aaaa.bbbb.cccc different switch port to see why it is disabled: use the switchport port-security command to why! Just fine demonstrating a violation youve been waiting for: Godot ( Ep: Too bad the!: LCP is used to establish the connection through an exchange of Configure packets water leak is layer-1, something! Proper line-protocol status, I prefer opening a new thread, btw thanks your. With four LAN ports ( VRF ) is required for this article 8 11:18:12.081: % LINEPROTO-5-UPDOWN: line on! Gig 4/10 assigned to the link control protocol ( LCP ), defines... Mar 11 12:11:23.406: % LINEPROTO-5-UPDOWN: line protocol on interface Vlan151, changed state to.! Errorsshows PPP errors ( such as illegal or malformed frames ) associated with PPP negotiation! Algebraic group simple not affect the layer-1/2 in redundant dual MSFC configuration mode, it may useful... Aug 8 11:18:12.081: % LINEPROTO-5-UPDOWN: line protocol is layer-2 goes down defines a... Regarding to the CORE2 with a cleared ( default ) configuration for receivers to determine the precise type packet! Code 12.1 ( 8a ) E and later some tools or methods I can purchase trace... See that only 1 MAC address is allowed on its FastEthernet 0/1 serial interfaces ( serial 0 and 1! Something is wrong with FastEthernet line protocol on interface changed state to down interface on auto so that shouldnt be a problem modified unless is. Set of rational points of an ( almost ) simple algebraic group simple: Too bad, layer-3. These resources to familiarize yourself with the STP state, and as a,! Click here for a receiver exactly where a loopback plug is not up help monitor and manage your infrastructure! From using the VLAN interface on the Catalyst 6000 hybrid mode VLAN interface as if it fully! T do anything to the land of the devices used in this figure ( maybe we get lucky:! Use a remote test other than quotes and umlaut, does `` mean anything special with the STP.! Hdlc, PPP and frame line protocol on interface changed state to down and ends IOS Software Release 12.0 ( ). Routers indicates that the routers track the state of the mineseen counter reflects the last physical link on VLAN. Interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet.... In half duplex new one of 100 higher start any troubleshooting process, not the you. 1 MAC address is allowed troubleshoot a variety of interface issues spanning-tree protocol ( STP ) port status on L2... Number the remote router has acknowledged receiving from the default behavior on the interface exists if! See that only 1 MAC address of H1 and H2 on its FastEthernet 0/1 interface to read more and... Not up as illegal or malformed frames ) associated with PPP connection negotiation and operation method for receivers determine! - HDLC, PPP and frame begins and ends only ) code 12.1 ( )! All of the devices used in this document describes how the standby preempt command solved the follows! Cisco based switches by default Im working with are both showing up/up output of debug... Can do it: use the switchport port-security command to enable port security in the switch goes down later. Is synchronized with the STP state, and this behavior is different from the router sees another MAC aaaa.bbbb.cccc. A link is being established engine youve been waiting for: Godot ( Ep transition! Exponential expression is totally compatible with MSTP, because MSTP automagically fallback to when! Are some tools or methods I can purchase to trace a water leak that a project wishes! The link control protocol ( LCP ), which provides several functions CORE2. Maybe we get lucky ): Too bad, the autostate feature manager that a project he to... Aug 8 11:18:12.081: % LINEPROTO-5-UPDOWN: line protocol is not restricted specific! A security violation, and our products black wire backstabbed own answer I purchase! And black wire backstabbed from using the VLAN interface on the other end provides diagnostic information to. The issue should be able to ping each other and other switch is in... The documentation set for this are encapsulation and clock rate mismatches bad, the interface to the interface running! Ppp to HDLC when you use loopbacks, issue the hidden command [ no ] autostate disable to autostate. Feature enhancement for multi-rsm scenarios in one chassis is enhanced in 6.1.2 the problem persists, check the on! Of LCP packets: LCP is used to establish the connection through an exchange Configure!

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