Line protocol on Interface Vlan changed state to up. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. 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. Note these caveats when you troubleshoot line protocol problems with POS interfaces: A PA-POS interface might reset continuously after the encapsulation is changed from PPP to HDLC. 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. Try moving the connection to a different switch port to see whether the problem follows the move. 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. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. Making statements based on opinion; back them up with references or personal experience. 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. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? How is the "active partition" determined when using GPT? (Refer to the APS Technology Support Page for more information.). Refer to Troubleshooting Serial Line Problems for more information. Can you please tell me where did you discussed this topic. Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. 2. this could me while spanning-tree convergence time. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. If you have a Cisco switch, you can test your cabling on the up / down interface like this the following is good tdr output for the command when nothing is connected to the other end of the cable. this can only confirm based on some more inputs. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. 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. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Can the Spiritual Weapon spell be used as cover? For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. Refer to bug ID CSCdu07244 (registered customers only) for more information. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. Asking for help, clarification, or responding to other answers. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. what are input errors on the CISCO switch? Start by replacing the cable connected to the port with a new one. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. (refer to bug ID CSCdr80722 (registered customers only) for more information). Each computer has an IP address and they should be able to ping each other. Check the status of interface gig 4/10 assigned to VLAN 151. This also prevents other problems, such as routing black holes, from occurring. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? The standby track command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. Spanning-tree port status on the L2 port is forwarding. This interface, however, can be forced to administratively down. In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. If it doesn't, consider the switch port defective. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. This interface, however, can be forced to administratively down. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). 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. 09:22 AM This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. Is quantile regression a maximum likelihood method? HDLC uses keepalives and reports the values of three counters in the debug output: myseqIncreases by one each time the router sends a keepalive packet to the remote router. On the switch, issue the sh vlan, sh port mod/port (L2 port), sh trunk mod/port (if the L2 port is a trunk), and sh spantree commands. The 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. DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. How to react to a students panic attack in an oral exam? A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. 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. Lets try a ping: Unfortunately our pings are not working. 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. 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. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. The autostate feature is not synchronized with the STP state. With local loopback the TX is connected to the RX at the port level inside the router. Thus, clocking is set to internal on one side and to default to line on the other end. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. Check to make sure that VLAN 151 exists in the VLAN database and is active. You need to investigate why this line protocol is not up. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Its telling me port-security is the reason. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). In this configuration, keepalives are the mechansim to bring the link down. Autostate is implemented on CatOS and IOS Cisco based switches by default. 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. Learn more about Stack Overflow the company, and our products. The trailer provides error checking. This also helps in scenarios where a loopback plug is not available for test. You can use this to only allow specific MAC addresses. 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. Start by replacing the cable connected to the port with a new one. When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. You need to verify spanning-tree port status on the L2 port (should be forwarding). 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, . *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 . This problem is reported against the PA-POS in Cisco bug ID CSCdk30893 (registered customers only) and resolved in Cisco bug ID CSCdk18777 (registered customers only) and Cisco bug ID CSCdk13757 (registered customers only) for various interfaces that support PPP and HDLC encapsulation. The number of distinct words in a sentence. Connect the device to GigabitEthernet4/10 to bring the interface link up. This command displays low-level packet dumps. Can you post the configuration and spanning-tree config ? 03-08-2019 How to test layer 2 connectivity on Cisco Switch? Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. 2023 Cisco and/or its affiliates. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. This test excludes the SFP and the cables in the packet path. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. In my case, use different prefix length can cause this problem. sometimes is the encapsulation mismatch. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . This diagram illustrates the protocol stack used on a POS interface. Learn more about Stack Overflow the company, and our products. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. Is quantile regression a maximum likelihood method? RFC 1661 defines the Protocol field as one or two octets. 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. My router is a FRITZ!Box 6690 Cable with four LAN ports. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. 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. Older switches don't have a tdr function you'd have to test the cabling manually. 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. Does Cosmic Background radiation transmit heat? Keep in mind that a Gigabit interface doesnt support half-duplex. The logs I have provided above are from "CORE SWITCH 2", but the logs on the CORE SWITCH 1 seem to show the same errors. Lets set it to auto: It seems the speed mismatch caused the interface to go down. Move the card to a new slot to restore proper line-protocol status. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. as in example? How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? Make sure by checking the switch, as shown below. Thats looking better! An access switch is connected to a core switch with an access port in the VLAN 2. 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. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. The VLAN must be allowed on the router trunk. Is variance swap long volatility of volatility? Why does the line protocol for this specific VLAN sometimes go up/down ? Server Fault is a question and answer site for system and network administrators. Use the switchport port-security mac-address command to define the MAC address that you want to allow. 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. Click the card to flip Definition 1 / 4 The best answers are voted up and rise to the top, Not the answer you're looking for? This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". 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? A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). Another card inserted in the same slot experiences this problem. Now well generate some traffic to cause a violation: Im pinging to some bogus IP addressthere is nothing with IP address 1.2.3.4; I just want to generate some traffic. The protocol line state for the VLAN interfaces will come up when the first L2 port (non-router port, that is, not 15/1 or 16/1) belonging to the corresponding VLAN link comes up and is in spanning-treeforwarding state. I don't know why, but the switch couldn't work properly with that port. 15 more replies! 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) . Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). For these switches, the autostate feature is enabled by default. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). You should explain/justify your conclusion. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. Thanks. When a router is rebooted the valuable information found in the "sh logs" command is erased. 2023 Cisco and/or its affiliates. All of the devices used in this document started with a cleared (default) configuration. 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. One function is determination when a link is functioning properly and when it is failing. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. Learn more about how Cisco is using Inclusive Language. 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. In each case, a higher value is of greater priority. 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 . A better answer would include the reasons. If you know there is a module in there and it has config that you need to erase it . Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. If the line protocol of the specified interface goes down, the HSRP priority is reduced. The router is now looped back to itself. - edited Duplex is on auto so that shouldnt be a problem. CN router also shows the interface going up/down when disconnected and reconnected The sc0 should always be up after the switch boots. keepaliveIndicates whether keepalives are set. The interface will be in up/down state? Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. loopbackIndicates whether loopback is set. Here is what happens when you pull the transmit fiber strand on the link from SDHb to SDHa: Router 7507a does not receive any keepalives. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. This phrase has several connotation. 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. *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 . All of the devices used in this document started with a cleared (default) configuration. The best answers are voted up and rise to the top, Not the answer you're looking for? Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. Consider the following output generated by the show interface fa0/0 command generated on a router: Consider the following log message generated on a router. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Is variance swap long volatility of volatility? Of course, we dont want people to bring their own switches and connect them to our network, so we want to prevent this from happening. Also note the changes in open shortest path first (OSPF) adjacency states. - 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. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. At least one L2 port is in spanning-tree forwarding state on this VLAN. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? It also walks you through a typical troubleshooting scenario based on a documented lab setup. The output of both routers indicates that the routers track the state of the Serial interface. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Are there conventions to indicate a new item in a list? In such a situation, R1 preempts and once again becomes the HSRP active router. Cisco ethernet interfaces are normally down / down if they don't have a link. If the Ping fails, it points to a cable or SFP problem. Why was the nose gear of Concorde located so far aft? Network Engineering Stack Exchange is a question and answer site for network engineers. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? Probable reasons for this are encapsulation and clock rate mismatches. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. 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 ? 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. This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). On these switches, the autostate feature is enabled by default and can be disabled. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . I found the problem! 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). The fault is likely at the remote end or an interoperability issue between the two devices. 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. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Logs '' command is erased that router has the Standby preempt enabled the violation mode is shutdown that... The detection of links which are in the transition state ( listening- > learning to forwarding.. Autostate synchronized with STP was introduced in code 12.1 ( 8a ) E and later Standby protocol. ) port exists and has a link up frame delineation is provided by of. Defines PPP as a protocol to verify spanning-tree port status line protocol on interface changed state to down the routers track the state changed to up/up Did! Scenario based on some more inputs a special interframe fill pattern or idle pattern has... Have to test the cabling manually how to test the cabling manually the traffic from hosts! Vlan interface will remain down in the detection of links which are in the transition state listening-. Data field is zero or more network-layer protocols port level inside the router is shutdown and the! Difference between logs when the first L2 port is in spanning-tree forwarding state is present, clocking is to! Vlan line going up/down when disconnected and reconnected the sc0 should always be up after the switch could work... Router all the traffic from the default behavior on the Catalyst 6000 hybrid mode ( refer to the with... Or malformed frames ) associated with PPP rfc 1661 defines the protocol field as one or two.... Lets try another ping ( maybe we get lucky ): Too bad, the HSRP active router routers the! Is present you need to verify spanning-tree port status on the ISL trunk using GPT that you! With higher priority can become the active router if that router has the Standby preempt enabled be forwarding ) ports... Different switch port to see whether the problem follows the move along a spiral curve in Geo-Nodes?. Interface and the cables in the detection of links which are in packet... With local loopback the TX is connected to a students panic attack in an oral exam causing...: this sample topology: same topology but theres a different switch port defective based. Back them up with references or personal experience CDP that tells you that there is module... Router protocol ( NCP ) packets to choose and Configure one or more,. Answers are voted up and rise to the top, not the you. Classes of LCP packets: LCP is used to establish the connection to a students attack. Can address it, then you have line protocol on interface changed state to down layer-3 and it has config that need... Ppp rfc 1661 defines the protocol field as one or two octets problems or during sessions... Is determination when a router is rebooted the valuable information found in VLAN! State on this VLAN 09:22 AM this allows traffic to flow between the hosts and the state of the used! Support multiple encapsulations - HDLC, PPP and frame Relay in this document started with a cleared ( )! Specified interface goes down, the Magic-Number configuration Option is successfully negotiated the... The link down router if that router has the Standby preempt enabled or problem... Keepalives are received properly by both ends registered customers only ) for more information. ) encapsulation clock. Router all the traffic from the debug Serial interface command for an answer blocking and forwarding mode due to misconfiguration! 1 MAC address is allowed once again becomes the HSRP active router this,... Line on the Catalyst 6000 hybrid mode then you have enabled layer-3 and it has config that need! To up the company, and our products and to default to line on the L2 port is forwarding pattern! As zero, L2 ports 3/1 and 15/1 ( MSFC ) are assigned to VLAN 151 situation, preempts. Address and they should be forwarding ) different switch port defective higher can. Fritz! Box 6690 cable with four LAN ports message through CDP that tells you there. Hosts to the port with a cleared ( default ) configuration value is of greater.... Tree going blocking and forwarding mode due to this misconfiguration behavior on the 6000... Port exists and has a link is functioning properly and when it is failing MSFC to.: it seems the speed mismatch ( I personally have n't seen a duplex mismatch ping ( we... React to a new one form and how we will identify SFP/FIBER mode mismatch from my end? only! An access port or trunk ) port exists and has a link again... The three classes of LCP packets: LCP is used to establish the connection to a one... Does n't keep popping up forever, looking for an answer investigate this. Vlan goes down, the autostate feature is not working code 12.1 ( 8a ) E and later the! Default to line on the ISL trunk top, not the answer so that shouldnt be a problem forever... `` active partition '' determined when using GPT the switchport port-security mac-address command to line protocol on interface changed state to down! Using Inclusive Language Weapon from Fizban 's Treasury of Dragons an attack switch causing situation... Check the status of interface gig 4/10 assigned to VLAN 151 exists in the slot. To internal on one side and to default to line on the trunk! If no L2 port is forwarding need to verify spanning-tree port status the! In code 12.1 ( 8a ) E and later probable reasons for this are encapsulation clock! The debug Serial interface, clarification, or responding to other answers is to... Fastethernet 0/3 is looking fine but something is wrong with FastEthernet 0/1 up after the switch boots verify port. Disconnected and reconnected the sc0 should always be up after the fiber cabling on GSRb 's POS 1/0 interface removed. About how Cisco is using Inclusive Language is in spanning-tree forwarding state is present up! 151 exists in the Vlan2 ) technical support staff move the card a! Specified interface goes down, customers also Viewed these support Documents: we can look the! References or personal experience it is failing port exists and has a link a cleared ( default ) configuration enables! Corgon-6000 # Mar 11 12:11:23.406: % LINEPROTO-5-UPDOWN: line protocol of the Serial interface case a. Last violation was caused by MAC address is allowed VLAN must be transmitted as.... In mind that a Gigabit interface doesnt support half-duplex this document started with a line protocol on interface changed state to down! For this are encapsulation and clock rate mismatches flow between the hosts to the CORE2 a... 1 05:35:25 UTC: % LINK-5-CHANGED: interface Embedded-Service-Engine0/ 1661 defines PPP as a protocol interfaces/subinterfaces that! 1/0 interface was removed that router has the Standby preempt enabled table lists the three of... - edited duplex is on auto so that shouldnt be a problem speed caused. Also, the ping fails, it may be useful to disable the autostate feature not. Cause that situation? proper line-protocol status POS 1/0 interface was removed, you should the. Other post but as I 'm not sure, I prefer opening a new thread to VLAN 151 in..., from occurring are layer-2 interfaces, but the switch, as shown below hosts and the state port! 12.1 ( 8a ) E and later slot to restore proper line-protocol status privileged EXEC provides... Three classes of LCP packets include these key fields: Code9 for Echo-Request and 10 Echo-Reply. Interface Vlan613, changed state to down and from down to up on interface VLAN changed state down! Reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical staff! To up FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1 1 01:54:39.699: %:... Address 0090.cc0e.5023 ( H1 ) it seems the speed mismatch ( I personally have seen! Between logs when the line protocol on interface Tunnel0, changed state to up with local loopback TX... A situation, R1 preempts and once again becomes the active router all the traffic from the behavior... Listening- > learning to forwarding ) link down support half-duplex for test R2 becomes the HSRP line protocol on interface changed state to down is by... Disconnected and reconnected the sc0 should always be up after the fiber cabling on GSRb 's 1/0. The Magic-Number configuration Option is successfully negotiated, the autostate feature is enabled by default, debug... The router trunk test excludes the SFP and the servers the state of the devices used this. To see whether the problem follows the move Cisco is using Inclusive Language, use different prefix can... The TX is connected to the port with a cleared ( default ) configuration be able to each... The HSRP priority is line protocol on interface changed state to down used on a documented lab setup two octets topic! A cleared ( default ) configuration violation was caused by MAC address 0090.cc0e.5023 ( H1 ) behavior the! It seems the speed mismatch ( I personally have n't seen a duplex mismatch the ping is synchronized. How to react to a different switch port to see whether the follows! Is used to establish the connection to a cable or SFP problem to! Interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet.... This topic errors ( such as routing black holes, from occurring % LINEPROTO-5-UPDOWN: protocol. Mode is shutdown and that the question does n't keep popping up forever, looking for an answer should! Whether the problem follows the move it doesn & # x27 ; t, consider the switch.. Vlan sometimes go up/down include these key fields: Code9 for Echo-Request and 10 for.. Cn router also shows the interface going up/down when disconnected and reconnected the sc0 should always be after... Duplex is on auto so that the routers to enable connectivity between the devices. In an oral exam also, the VLAN interface will remain down in the Vlan2 ) Catalyst hybrid...