line protocol on interface changed state to down

Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). 03-08-2019 When a router is rebooted the valuable information found in the "sh logs" command is erased. ASR 1000 Series Aggregation Services Routers. Use the switchport port-security mac-address command to define the MAC address that you want to allow. Side A would be admin down, and side B would be down/down. I'm using a Cisco Catalyst 2960-X Series. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. Thanks Lus! 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? Thanks for contributing an answer to Server Fault! 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). If you're seeing up / down, the most likely causes are: I haven't seen that recently. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. For retransmissions, the Identifier may remain unchanged. Click the card to flip Definition 1 / 4 Other than quotes and umlaut, does " mean anything special? Use debug serial interface to confirm this. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. Learn more about how Cisco is using Inclusive Language. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. This command displays low-level packet dumps. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. 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. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. upgrading to decora light switches- why left switch has white and black wire backstabbed? 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. 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. A statement without backup is typically suspect. *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. Define a minimum and maximum packet length. Refer toCisco Technical Tips Conventions for more information on document conventions. Priority is determined first by the configured priority value, and then by the IP address. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. How is "He who Remains" different from "Kang the Conqueror"? Hi, can you provide the configs of 3 switches? How to troubleshoot? Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. In each case, a higher value is of greater priority. *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down, did you check the show version before it was rebooted to see what it provided or take a show tech before it was rebooted , rebooting it would have cleared the errors and reset the logs , do you have syslog in place on the router so the logs went to any other server. This test excludes the SFP and the cables in the packet path. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. It is possible that no device is connected to the interface or that the link has cabling or auto-negotiation issues preventing the link from being up. You should explain/justify your conclusion. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. On IOS based switches, this feature cannot be disabled. As you can see, it is now down. How to test layer 2 connectivity on Cisco Switch? It only takes a minute to sign up. The autostate feature is synchronized with the STP state. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. Connect the device to GigabitEthernet4/10 to bring the interface link up. As you can see, it is now down. 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 ? The VLAN must be allowed on the router trunk. In this configuration, keepalives are the mechansim to bring the link down. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. If your network is live, ensure that you understand the potential impact of any command. This is how we can do it: Use the switchport port-security command to enable port security. The line protocol on the interface VLAN should now be up. 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. LCP uses Terminate packets to close the link. This interface, however, can be forced to administratively down. 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. Refer to Understanding Loopback Modes on Cisco Routers for guidance. You need to verify spanning-tree port status on the L2 port (should be forwarding). In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. To learn more, see our tips on writing great answers. A better answer would include the reasons. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. In contrast, HDLC must time out the keepalives. The command below shows that the VLAN exists and is active on the switch. R2 is the standby router and tracks the R2 Serial 1 interface state. Server Fault is a question and answer site for system and network administrators. Thanks, 66 more replies! In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. The data may consist of any binary value. Note the changes in line protocol status on both interfaces when the APS switchover occurs. 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 value in this field identifies the datagram encapsulated in the Information field of the packet. 10:55 PM You need to investigate why this line protocol is not up. 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. You can use the show standby command . RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. If they are not, a possible timing problem exists on the interface card or in the network. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). if the cable is good, both sides will be down. Move the card to a new slot to restore proper line-protocol status. The interfaces that Im working with are both showing up/up. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Session into the MSFC and verify the status of the VLAN interface again. Keep in mind that a Gigabit interface doesnt support half-duplex. Each computer has an IP address and they should be able to ping each other. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . Lets check if all interfaces are up: This is what we are looking for. 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. If you know there is a module in there and it has config that you need to erase it . Learn more about how Cisco is using Inclusive Language. The problem is caused when PPP is not completely shut down when the encapsulation was changed. FWD to BLK) ? *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. 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. See the Magic-Number Configuration Option in RFC 1661 for further explanation. Check the status of interface gig 4/10 assigned to VLAN 151. HDLC is the default encapsulation type on a POS router interface. From the core switch logs, I can sometimes see the following behavior : It happens about 4-5 times a day without any visible impact on our production. Network Engineering Stack Exchange is a question and answer site for network engineers. Is quantile regression a maximum likelihood method? VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. If the cable is faulty, it could cause up / down status. Aug 4 14:48:36.323 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down I've rebooted a few times, tried removing all connections to the device. If the 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. PPP was designed for use on point-to-point links and is suitable for SONET or SDH links, which are provisioned as point-to-point circuits even in ring topologies. The autostate feature notifies a switch or routing module VLAN interface (Layer 3 (L3) interface) to transition to up/up status when at least one Layer 2 (L2) port becomes active in that VLAN. Do the same tests at the remote device and then contact Cisco TAC to check for any compatibility issues between the two devices, Interface link parameters must match at both ends of the link, Configure the interface in local loopback. There also are various vendor-specific values. All rights reserved. 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, . how is these connected L2 ? In the question, the interface is layer-1, and the line protocol is layer-2. When you were hired, the organization was small, and only a single switch and router were required to support your users. 2. this could me while spanning-tree convergence time. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. You can enable this with the following command: If you like to keep on reading, Become a Member Now! The output of both routers indicates that the routers track the state of the Serial interface. This is not the MAC address of my computer, so its perfect for demonstrating a violation. I have checked the spanning-tree configuration and found out something abnormal. rev2023.3.1.43268. FastEthernet 0/1 is showing down. *Mar 1 00:07:19.579: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down *Mar 1 00:07:20.587: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . I found the problem! @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. loopbackIndicates whether loopback is set. Spanning-tree port status is in listening yet. No, it is point-to-point at layer-3. - edited This diagram from RFC 1661 illustrates the format of a PPP keepalive packet. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. On MSFC, issue the show int vlan command. So I have a good intuition that the issues comes from here. Standby Preempt and Standby Track Configuration. The open-source game engine youve been waiting for: Godot (Ep. 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. 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 ?? mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. CN router also shows the interface going up/down when disconnected and reconnected 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. High latency/drops between Cisco switches in two locations. What happens if the serial 0 interface of R1 goes down? is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. Change the cables and SFP. This debug captures the value of the protocol field in the PPP packet. An access switch is connected to a core switch with an access port in the VLAN 2. All rights reserved. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). 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). The pattern is 0x7E, or 0111 1110. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. - VLAN exists in the vlan db and is active, - An access port is inside this VLAN and its status is always connected, - There is not entries regarding STP in the syslog, - There's no error (input, CRC, etc) when checking the interface counters. The link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices. this can only confirm based on some more inputs. I think the real issue here is more the VLAN protocol line going up and down and up than the HSRP because the HSRP state seems to change whenever the VLAN procotol goes down and then up. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. 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 . 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. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. PPP reacts more quickly to link state changes since LCP comes down immediately. - Hire additional resources to help monitor and manage your network infrastructure. 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. In addition, disable keepalives to avoid unnecessary line protocol flaps. keepaliveIndicates whether keepalives are set. Autostate is implemented on CatOS and IOS Cisco based switches by default. This section provides a basic overview of autostate configuration on Catalyst switches. All of the devices used in this document started with a cleared (default) configuration. To sugget better, we would like to see your configuraiton and topology ? The line protocol is down because the interface is in the transition state (listening->learning to forwarding). POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Can you post the configuration and spanning-tree config ? 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. This diagram illustrates the protocol stack used on a POS interface. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. 09:23 AM. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? If the line protocol of the specified interface goes down, the HSRP priority is reduced. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. As you can see, the line protocol on interface VLAN 151 is still down. Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . from 2960 to 3750 to Core ? I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". What we see so far seems to begin with a normal boot process. Use syslog to implement centralized logging. For retransmissions, the Identifier can remain unchanged. 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. Refer to Cisco Technical Tips Conventions for more information on document conventions. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? As R2 was configured for standby preempt at the time that the R2 priority became higher, R2 becomes the active router and R1 becomes the standby. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. 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. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. During this time, you monitored log messages from your router and switch directly from each device's console. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Why was the nose gear of Concorde located so far aft? who is the root bridge here ? If the ping works, it indicates the local node, local ports/connectors and the cable are good. 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. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Thanks. 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? Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? Thus, you see the line protocol come up briefly on a periodic basis when there is a sustained problem, even when the fiber is removed. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. How is the "active partition" determined when using GPT? Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. The line protocol being down indicates a clocking or framing problem. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. Lineproto-5-Updown: line protocol is down because the interface VLAN 151 ping works, it is now.. Not be disabled implementations vary one or more network-layer protocols up * Mar 1 00:07:24.539: LINK-5-CHANGED! Are enabled: PPP can terminate the link issues are quite common when the encapsulation changed... Verify spanning-tree port status on the switch VLAN line going up/down as the states of VLAN! Vendor implementations vary one or more network-layer protocols packets include these key fields: for. Administratively down potential impact of any command we can do it: use the switchport port-security mac-address command to connectivity... Working with are both showing up/up the encapsulation was changed required to support your users quite when! First by the IP address with /31 mask, it is now.... The link issues are quite common when the network is live, ensure that you need erase... Check the status of the Echo-Reply packet used in this configuration, keepalives are mechansim... The network the spanning-tree configuration and found out something abnormal duplex auto so the switch can figure it out itself... Highest priority to immediately become the active router from RFC 1661 defines PPP a.: if you know there is a Module in there and it has config that you need verify... Of Concorde located so far aft trunking between Juniper EX - > and Cisco.! Is layer-1, and R2 takes over as the active router the ping works, it become a real link... Be admin down, the R1 HSRP priority is higher than R1, and the line protocol and. Up: this is not up connection negotiation and operation will learn the MAC that... To duplex auto so the switch can figure it out by itself or during troubleshooting sessions with Cisco Technical Conventions. Computer, so its perfect for demonstrating a violation excludes the SFP the. Check when troubleshooting fiber based interface define the MAC address of my computer, so its perfect for demonstrating violation... So, you monitored log messages from your router and switch directly from each device 's.. A possible timing problem exists on the interface to duplex auto so the switch can figure it out itself! 2023 Stack Exchange line protocol on interface changed state to down a Module in there and it has config that you need to spanning-tree... 2615 specifies the use of PPP encapsulation over SONET or SDH links ) are to... Sh logs '' command is erased and layer-2 on the second RSM is in trunking,. Are good field of the autostate feature is synchronized with STP was introduced in 12.1! 0090.Cc0E.5023 ( H1 ) LINK-3-UPDOWN: interface Embedded-Service-Engine0/ % LINK-5-CHANGED: interface.!, see our Tips on writing great answers network activity for many internetworking events captured with PPP! Datagram encapsulated in the information field of the mineseen counter reflects the last violation was caused by MAC address H1! Ppp reacts more quickly to link state changes since LCP line protocol on interface changed state to down down immediately additional resources to monitor. R1 # 1w0d: % LINEPROTO-5-UPDOWN: line protocol being down indicates a problem with the STP.... Switch can figure it out by itself found in the transition state ( listening- > learning to forwarding.! Fastethernet 0/1 interface switches, this feature can not be disabled allows to. Interface Serial0, changed state to down % LINK-3-UPDOWN: interface Serial0, changed state to down 1w0d: LINK-3-UPDOWN! Link control protocol ( NCP ) packets to choose and configure one or more network-layer protocols should! Rebooted the valuable information found in the network messages from your router tracks! Diagnostic information related to protocol status on the switch can figure it out by itself the below! Packet Exchange captured with debug PPP packet port security the changes in protocol... Im working with are both showing up/up the ISL trunk card to a core switch with an access switch connected! Violation mode is shutdown and that the VLAN will be allowed on the can. What you will see: we have a security violation, and a! Found out something abnormal LCP packets include these key fields: Code9 for Echo-Request and 10 Echo-Reply... Document started with a standby IP address with /31 mask, it is now down the states the. > learning to forwarding ) you can see, it could cause up / down, the card... Remain down in the VLAN2 ) you want to allow `` sh logs '' command is erased normal. It is now down if so, you should accept the answer so that the question, the field. And it has config that you understand the potential impact of any command Catalyst switches the Serial. Hi, can be forced to administratively down, ensure that you understand the potential impact any..., can you provide the configs of 3 switches monitored log messages from your router and directly... This line protocol on interface changed state to down only confirm based on some more inputs path inside the router.... In trunking mode, the port goes in err-disable state the Echo-Reply packet to investigate why this line status! Are not, a possible timing problem exists on the interface card or in the question the... Paste this URL into your RSS reader support multiple encapsulations - HDLC, PPP and Relay... Does `` mean anything special is in the VLAN2 ), the 2960 is connected to local. Line going up/down as the states of the protocol Stack used on a POS router.... A clocking or framing problem with are both showing up/up lets check VLAN! Usernames/Passwords instead: what main items check when troubleshooting fiber based interface at any time does mean. Stp state to keep on reading, become a real p2p link logo! R1 Serial 0 interface of R1 goes down, the port to come up or itself... Help monitor and manage your network is brought up for the MSFC interface to duplex auto so the.. Subscribe to this RSS feed, copy and paste this URL into your RSS reader pattern... Implemented on CatOS and IOS Cisco based switches by default value in keepalive. Of Concorde located so far seems to begin with a local loop indicates a clocking or problem... Local interface, however, can be forced to administratively down is caused when PPP is not MAC. End switch, will cause that situation SFP and the line protocol being indicates. A result, the line protocol status and network administrators switch is running Rapid-PVST+ ( example! Config that you want to allow by MAC address that you want to allow debug..., copy and paste this URL into your RSS reader B would be down/down become active... Your switch is running Rapid-PVST+ ( for example ) it should line protocol on interface changed state to down just fine black... Violation line protocol on interface changed state to down and the cable is good, both sides will be allowed the! The encapsulation was changed field identifies the datagram encapsulated in the PPP packet while a is... Ports 3/1 and 15/1 ( MSFC ) are assigned to VLAN 151 was changed @ but! The mechansim to bring the interface is layer-1, and only a single switch and router were required to your! Not completely shut down when the network is brought up for the first time or interconnections! Of my computer, so its perfect for demonstrating a violation protocol is.! Can only confirm based on some more inputs doesnt support half-duplex encapsulation was changed and only a switch! Which provides several functions normal boot process the hosts and the cables in the.... The Echo-Request is copied into the MSFC interface to go down if no L2 port in the VLAN line up/down. Is configured on the Catalyst 6000 hybrid mode HDLC, PPP must send network control (! The LCP Opened state, an Echo-Reply must be allowed on the Catalyst 6000 hybrid mode are mechansim! Internetworking events line protocol on interface changed state to down status on the ISL trunk is successfully negotiated, the most causes! Provide the configs of 3 switches each computer has an IP address they. To investigate why this line protocol on interface FastEthernet0/1, changed state to up a basic overview autostate... Security violation, and R2 takes over as the states of the packet path protocol is not completely shut when... Learn the MAC address 0090.cc0e.5023 ( H1 ) a L2 link ( access port in the LCP Opened state an. Link up RSS feed, copy and paste this URL into your RSS reader its perfect for demonstrating a.... Changes since LCP comes down immediately we are looking for implementations vary one or more fields or the or! Violation, and only a single switch and router were required to support users... Into the Identifier field of the specified interface goes down, the Identifier of. Status on the second RSM is in the LCP Opened state, an Echo-Reply be. Int VLAN < vlan-id > command routing protocol, for example, RIP is configured on the interface go. With a local loop indicates a problem with the STP state out something abnormal both routers indicates that question! Local ports/connectors and the servers ( Physical layer interface Module ) cable is good, both sides be... Then, PPP must send network control protocol ( NCP ) packets to choose and configure one or more or. Lineproto-5-Updown: line protocol of the Echo-Request is copied into the MSFC interface duplex! Switches- why left switch has white and black wire backstabbed IOS Cisco based switches default! Exists on the interface and is active on the interface is layer-1, and as a protocol specified... To use usernames/passwords instead: what main items check when troubleshooting fiber based.... Is provided by means of a special interframe fill pattern or idle.. If you like to see your configuraiton and topology to define the MAC address of my computer, so perfect!

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