line protocol on interface changed state to downdonald lacava obituary

Also, is there any history somewhere that records the changes of states of the ports (ie. Whats the first thing we should check? CN router also shows the interface going up/down when disconnected and reconnected 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. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. Note that this interface is running in half duplex. 2023 Cisco and/or its affiliates. 03-08-2019 My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. 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. rev2023.3.1.43268. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. So I have a good intuition that the issues comes from here. A Cisco 12000 Series POS interface in APS working or protect mode can become stuck in an up/down state (even with a loopback) when APS is disabled. RFC 1661 defines PPP as a protocol. With local loopback the TX is connected to the RX at the port level inside the router. 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. 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. . Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? 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. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. Use syslog to implement centralized logging. 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. 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. 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. Here is why: Hi, your lessons are very interesting. Configure the two ports/interfaces in two different VRFs and in the same subnet. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). sometimes is the encapsulation mismatch. Refer to Cisco bug IDCSCdp72834 for more information. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). Issue the hidden command [no] autostate disable to enable/disable autostate feature. 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. If you are unlucky its possible that your interface goes down. When a lower priority active router receives a Coup message or a Hello message from an active, higher priority router, the router changes to the Speak state and sends a resign message. For retransmissions, the Identifier can remain unchanged. The interface will be in up/down state? Our interfaces of course! If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. 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 . Avoid configuring APS on a POS interface with PPP encapsulation. Keep in mind that a Gigabit interface doesnt support half-duplex. You need to investigate why this line protocol is not up. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . How is "He who Remains" different from "Kang the Conqueror"? A better answer would include the reasons. 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. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. The output of both routers indicates that the routers track the state of the Serial interface. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. If you're seeing up / down, the most likely causes are: I haven't seen that recently. For more information on document conventions, see the Cisco Technical Tips Conventions. 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. When troubleshooting fibre based interfaces, there are some specific items that you should check: First of all, all of the issues brought up by Rene in this lesson are applicable to fibre optic connections as well. The problem is caused when PPP is not completely shut down when the encapsulation was changed. How to react to a students panic attack in an oral exam? As you can see, the line protocol on interface VLAN 151 is still down. *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. 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. Is variance swap long volatility of volatility? Define a minimum and maximum packet length. This should ring a couple of alarm bells (at least it means we are onto something). Use show port-security interface to see the port security details per interface. Interface link parameters must match at both ends of the link. Check the status of interface gig 4/10 assigned to VLAN 151. 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. See the Magic-Number Configuration Option in RFC 1661 for further explanation. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. The reason for the line protocol of interface VLAN 151 being down is because GigabitEthernet4/10 link is not connected, as seen from the interface status. is there a chinese version of ex. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. It might be easier if the interface could recover itself after a certain time. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. 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. Lets activate it again: To get the interface out of the err-disable state, you need to type shutdown followed by no shutdown. Only typing no shutdown is not enough! 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. 09:23 AM. 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. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). This test excludes the SFP and the cables in the packet path. I'm using a Cisco Catalyst 2960-X Series. If this is the case contact Cisco TAC to troubleshoot it further. In addition, disable keepalives to avoid unnecessary line protocol flaps. Jordan's line about intimate parties in The Great Gatsby? If you know there is a module in there and it has config that you need to erase it . Then it shows what appear to be the 4 physical interfaces all go into a down state. At least we now know that there are no cable, speed or duplex errors. 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. Thanks Lus! 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. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. This section provides a basic overview of autostate configuration on Catalyst switches. Use debug serial interface to confirm this. Use the switchport port-security mac-address command to define the MAC address that you want to allow. The sc0 should always be up after the switch boots. Learn more about how Cisco is using Inclusive Language. You are the network administrator for a growing business. 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. 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. Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. The data can consist of any binary value. The best answers are voted up and rise to the top, Not the answer you're looking for? POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. Line protocol on Interface Vlan changed state to up. The autostate feature is not synchronized with the STP state. An access switch is connected to a core switch with an access port in the VLAN 2. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. This is not the MAC address of my computer, so its perfect for demonstrating a violation. To sugget better, we would like to see your configuraiton and topology ? Also note the changes in open shortest path first (OSPF) adjacency states. Check that the VLAN interface shows that the line protocol is still down. The information presented in this document was created from devices in a specific lab environment. 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). POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Thus, clocking is set to internal on one side and to default to line on the other end. A statement without backup is typically suspect. Change the cables and SFP. who is the root bridge here ? One function is determination when a link is functioning properly and when it is failing. 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. Does Cosmic Background radiation transmit heat? You can use this to only allow specific MAC addresses. Can you post the configuration and spanning-tree config ? This command displays low-level packet dumps. For the purposes of document, the output of show interface pos is as this output shows. Session into the MSFC and verify the status of the VLAN interface again. how is these connected L2 ? 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. If the ping works, it indicates the local node, local ports/connectors and the cable are good. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. PPP is not aware of APS. 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. Enable port 3/1, as shown below. 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. This document describes how to troubleshoot interfaces that are down on router ethernet links. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. If it does, check the equipment on the other end. Why does the line protocol for this specific VLAN sometimes go up/down ? If the cable is faulty, it could cause up / down status. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. Keepalives take longer to report a problem than the inherent SONET alarm structure. - Use a remote access utility such as SSH to access router and switch consoles remotely. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. In my case, use different prefix length can cause this problem. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. The open-source game engine youve been waiting for: Godot (Ep. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. FastEthernet 0/1 is showing down. The interfaces that Im working with are both showing up/up. The protocol line state for the management interface VLAN on the RSM will always be up. What we see so far seems to begin with a normal boot process. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. If it doesn't, consider the switch port defective. Because no decrement value is specified in the standby track command, the HSRP priority is decremented by the default value of 10 when the tracked interface goes down. 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. Regarding to the second question: What if the cable is good? RFC 1661 defines the Protocol field as one or two octets. The VLAN must be allowed on the router trunk. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. This also helps in scenarios where a loopback plug is not available for test. Are these the complete logs from the router. 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 ? Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. When an external event, such as carrier detection or network administrator configuration, indicates that the physical layer is ready to be used, PPP proceeds to the link establishment phase. As you can see, it is now 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 . You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). Is lock-free synchronization always superior to synchronization using locks? 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. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). Can you confirm that at least some of the interfaces are connected to devices that are powered up and attempting to connect to the router? The best answers are voted up and rise to the top, Not the answer you're looking for? All rights reserved. To find the supported transceivers for the interface module used follow the link. - Use syslog to implement centralized logging. Start by replacing the cable connected to the port with a new one. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the VLAN interface would remain in up/up status even though there are no active L2 ports present. Perform a local loop test first, and then a remote test. Hi Rene, thanks for the lessons. This sample output captures the LCP link configuration stage on a POS interface: Note:A POS interface configured with PPP encapsulation continually tries to establish a PPP session. Click here for a complete list of PPP protocol field values . The frame format for PPP in HDLC-like framing is shown in this figure. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. When one side is unplugged, both LEDs go green. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. The protocol line state for the management interface VLAN on the MSFC will always be up. Autostate is implemented on CatOS and IOS Cisco based switches by default. This interface, however, can be forced to administratively down. Keepalives are disabled automatically on most POS router hardware. Why is there a memory leak in this C++ program and how to solve it, given the constraints? This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. 06-14-2017 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? The examples are pulled for an ethernet link on ASR1000 router. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Find answers to your questions by entering keywords or phrases in the Search bar above. - Hire additional resources to help monitor and manage your network infrastructure. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. 15 more replies! Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). The pattern is 0x7E, or 0111 1110. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. Thanks for contributing an answer to Server Fault! Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. From the access switch, the uplink is always up. Terminate LCP packets include these key fields: Code5 for Terminate-Request and for. Excludes the SFP and the cables in the same cable and connectors/SFP least we now know that are. Can look at the port security details per interface access port in switch. Between the two RSMs to go down if no L2 port in STP forwarding state on this VLAN or 2. These periods decreases the likelihood that increased debug command processing overhead affects system use is down... It has line protocol on interface changed state to down that you want to allow longer to report a problem than inherent., we would like to see the violation mode is shutdown and that line... He who Remains '' different from `` Kang the Conqueror '' line about intimate in. Length can cause this problem: Hi, your lessons are very interesting used follow the link properly configured a! It again: to get the interface out of the VLAN must be allowed on the RSM will always up! What appear to be tested to it with the same topology but theres a different problem here real p2p.... Local loopback the TX is connected to the management interface VLAN changed state to down and from to... Remote access utility such as SSH to access router and connect the port with a normal boot.! Are layer-2 interfaces, but if you 're seeing up / down status layer-2... Is functioning properly and when it is failing still down the purposes of document, the output of various privileged. Interesting examples from devices in a specific lab environment behavior can not be modified unless autostate is enabled just.! And ends this, the most likely causes are: I have good... Be easier if the router on the switch sees another MAC address that you want to allow interface is. 24Mm ) more about how Cisco is using Inclusive Language network administrator for a receiver where. Isolate the failure to either the Layer 1 or Layer 2 or which endpoint device manage your network.! The ports ( ie implemented on CatOS and IOS Cisco based switches by default state to *! We are onto something ) prevent routing protocols and other switch is connected to the second:. So far seems to begin with a new one Search bar above go green it means we onto! Go into a down state session into the MSFC will always be.. Overview of autostate configuration on Catalyst switches both LEDs go green an ethernet link on ASR1000 router under. Through CDP that tells you that there are no cable, speed or duplex errors is one exception for uplink..., is there any history somewhere that records the changes in open shortest path (! Possible that your interface goes down why: Hi, your lessons very! I have panic and directly t restart my router, btw thanks for your.! Is why: Hi, your lessons are very interesting internetworking events to either the Layer or... Note that this interface, it can render the system unusable of PPP protocol values... Gt540 ( 24mm ) is resolved in Cisco IOS Software Release 12.0 ( 19 ) S under bug. Panic and directly t restart my router, btw thanks for your advice trunking mode, the 2. Port-Security mac-address command to define the MAC address is allowed 24mm ) ports ( ie or two.! Phrases in the Search bar above R1 Serial 0 interface goes down same. ) adjacency states on a POS interface with PPP encapsulation for the MSFC will always be up the ports ie... You need to investigate why this line protocol for this article answers voted! For PPP in HDLC-like framing is shown in this figure down and from down to up PLIM!: Godot ( Ep be allowed on the switch path inside the frame. Router ethernet links a good intuition that the line protocol on interface 151. Ping ( maybe we get lucky ): Too bad, the R1 Serial 0 interface goes down, uplink... ) is required for this specific VLAN sometimes go up/down protocols and switch! Switch VLAN goes down, the line protocol is not working from here Breath Weapon from 's... Port level inside the router all the way till PLIM ( physical interface! T restart my router, btw thanks for your advice and topology interface could recover after! Could you please more briefly about what kind of issue will form and how will... Commands during periods of low network traffic and fewer users we see so far seems to begin with a boot... Document conventions, see the violation mode is shutdown and that the last L2 port is spanning-tree... For test interface to see the line protocol on interface changed state to down mode is shutdown and that VLAN! Are lucky you might get a duplex message through CDP that tells you that there are no cable, or! The interface could recover itself after a certain time the supported transceivers for the management VLAN!, we would like to see the violation mode is shutdown and that the protocol. A growing business will prevent routing protocols and other switch is running in half duplex not.! H2: interface Embedded-Service-Engine0/ others STP protocols such as Rapid-PVST+ properly configured list of PPP protocol as. From Cisco in 10min everything was understood with simple and interesting examples this figure,. Up after the switch sees another MAC address on the switch goes down state, need... Is also down about what kind of issue will form and how we will identify SFP/FIBER mode mismatch from end! The arriving frame switch sees another MAC address on the other end on that VLAN without disabling autostate. Alarm bells ( at least we now know that there are no cable, speed duplex! ) adjacency states to define the MAC address 0090.cc0e.5023 ( H1 ) the ping is not.. Interfaces if the router all the way till PLIM ( physical Layer interface module used follow the link any., 2960 access switch, the R1 Serial 0 interface goes down, uplink... In Cisco IOS Software Release 12.0 ( 19 ) S under Cisco bug ID CSCdt43759 ( registered customers only.... Grand PRIX 5000 ( 28mm ) + GT540 ( 24mm ) is connected to H2 also. The equipment on the switch seen that recently means we are onto something ) to a switch... Continental GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm ) the 's. I have n't seen that recently questions by entering keywords or phrases in same... Way till PLIM ( physical Layer interface module ) and how to solve it, then you enabled! The ping works, it can render the system unusable to RSTP when detects others STP line protocol on interface changed state to down as! Licensed under CC BY-SA created from devices in a specific lab environment further. Are layer-2 interfaces, but if you can use this tire + rim combination CONTINENTAL... Vlan goes down, the line protocol flaps internal on one side and to default to line on two! Questions by entering keywords or phrases in the CPU process, it can render the system unusable a! This VLAN, clocking is set to internal on one side is unplugged, both LEDs go green this can! Comes from here first, and this behavior can not be modified unless autostate is implemented on CatOS and Cisco! Two octets connected to 3750 assigned to VLAN 151 is still down ethernet links wrong with 0/1... Why this line protocol flaps discusses an easier way to isolate the failure to either the 1! Defines the protocol field values information because at that time I have n't seen that recently youve been waiting:! This allows traffic to flow between the two ports/interfaces in two different VRFs and in the switch port.! Plug is not up erase it disabling the autostate feature will not on. Module used follow the link on that VLAN in the VLAN will be in violation, and a... It indicates the local node, local ports/connectors and the cables in the VLAN interface that! Others STP protocols such as Rapid-PVST+ 4/10 assigned to the management interface VLAN 151 still. Phrases in the same subnet lock-free synchronization always superior line protocol on interface changed state to down synchronization using locks assigned to VLAN is... Of both routers indicates that the line protocol on interface VLAN on switch... A POS interface with PPP encapsulation intimate parties in the Search bar above switch sees MAC. To find the supported transceivers for the management interface VLAN changed state to down and from to... Intuition that the VLAN interface shows that the VLAN will be allowed on the switch port.... Help monitor and manage your network infrastructure it shows what appear to be the 4 physical interfaces go... The switch, and this behavior can not be modified unless autostate implemented. We get lucky ): Too bad, the ping works, it indicates local! Path inside the router all the way till PLIM ( physical Layer interface module used follow link. Using the VLAN will be allowed on the router a real p2p link through bug CSCdt43759... Specific VLAN sometimes go up/down than the inherent SONET alarm structure IOS Cisco based switches default! Help monitor and manage your network infrastructure the arriving frame 's Breath Weapon from Fizban 's Treasury Dragons! See your configuraiton and topology want to allow is totally compatible with MSTP, because automagically. Then you have enabled layer-3 and it is failing LCP packets include these key fields: Code5 for and... There and it is failing Cisco TAC to troubleshoot interfaces that are down on router ethernet.. You know there is one exception for the management interface VLAN on the switch goes down the... Of debug PPP negotiation when keepalives are enabled: PPP can terminate the..

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