line protocol on interface changed state to down

When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. This phrase has several connotation. 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. The protocol line state for the VLAN interfaces will come up when the first switchport belonging to the corresponding VLAN link comes up and is in spanning-tree forwarding state. Refer to bug ID CSCdu07244 (registered customers only) for more information. 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. The Spanning-tree port status is LRN, which means learning state. The fault is likely at the remote end or an interoperability issue between the two devices. 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. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the MSFC interface would remain in up/up status even though there are no active L2 ports present. How to test layer 2 connectivity on Cisco Switch? 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. Sorry, I have only these pictures. If we want, we can change this behavior with port security. Refer to the following guidelines: The autostate feature is enabled by default. All rights reserved. - Use a remote access utility such as SSH to access router and switch consoles remotely. Connect the device to GigabitEthernet4/10 to bring the interface link up. 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 examples are pulled for an ethernet link on ASR1000 router. 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. And if the cable is bad? At least one L2 port is in spanning-tree forwarding state on this VLAN. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. 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. CN router also shows the interface going up/down when disconnected and reconnected 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. It might be easier if the interface could recover itself after a certain time. Only registered Cisco users can access internal bug information. Spanning-tree port status on the L2 port is forwarding. Avoid configuring APS on a POS interface with PPP encapsulation. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. 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. 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 ?? LCP uses Terminate packets to close the link. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. Hi Rene, thanks for the lessons. Note: FastEthernet interfaces by-definition can only test two of the four pairs. For these switches, the autostate feature is enabled by default. The documentation set for this product strives to use bias-free language. This test is particularly useful when the loopback test is successful to identify which end of the link is at fault or if it is an interoperability issue between devices. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). %LINEPROTO. In this configuration, keepalives are the mechansim to bring the link down. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. Troubleshoot. Lets take a closer look at port security: Here is a useful command to check your port security configuration. The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. It also walks you through a typical troubleshooting scenario based on a documented lab setup. Thanks, 66 more replies! As well as helping to identify that the line protocol is down, it explains the show and debug commands to use to troubleshoot the issue for both Point-to-Point Protocol (PPP) and high-level data link control (HDLC) encapsulation. How is the "active partition" determined when using GPT? I finally noticed that the other router interface it was connected to had no keep alive. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. Well assume the computers are configured correctly and there are no issues there. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. New here? At least one L2 (access port or trunk) port exists and has a link up on this VLAN. PPP reacts more quickly to link state changes since LCP comes down immediately. 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? RFC 1661 defines the Protocol field as one or two octets. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Refer to Troubleshooting Serial Line Problems for more information. Line protocol on Interface Vlan changed state to up. The command below shows that the VLAN exists and is active on the switch. Its telling me port-security is the reason. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). 2023 Cisco and/or its affiliates. Was Galileo expecting to see so many stars? Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. The state of R1 is active and the state of R2 is standby. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Can you please tell me where did you discussed this topic. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. High latency/drops between Cisco switches in two locations. Use show port-security interface to see the port security details per interface. when HSRP failing - this could be low reasons. Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. Check that the VLAN interface shows that the line protocol is still down. In addition, disable keepalives to avoid unnecessary line protocol flaps. Then it shows what appear to be the 4 physical interfaces all go into a down state. The receiver of a Terminate-Request should wait for the peer to disconnect, and must not disconnect until at least one Restart time has passed after sending a Terminate-Ack. This change makes the R2 priority of 100 higher. The problem is caused when PPP is not completely shut down when the encapsulation was changed. *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 . Find answers to your questions by entering keywords or phrases in the Search bar above. So I have a good intuition that the issues comes from here. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? No, it is point-to-point at layer-3. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . GigabitEthernet interfaces can test all four pairs. All rights reserved. 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. What happens if the serial 0 interface of R1 goes down? Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. The autostate feature is synchronized with the STP state. How to extract the coefficients from a long exponential expression? What tool to use for the online analogue of "writing lecture notes on a blackboard"? This output illustrates the packet exchange captured with debug ppp packet while a link is being established. Probable reasons for this are encapsulation and clock rate mismatches. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. Try moving the connection to a different switch port to see whether the problem follows the move. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. What are some tools or methods I can purchase to trace a water leak? 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, . Asking for help, clarification, or responding to other answers. There also are various vendor-specific values. The information in this document is based on these software and hardware versions: The information in this document was created from the devices in a specific lab environment. Here is why: Hi, your lessons are very interesting. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. 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. what are input errors on the CISCO switch? 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. 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. Does anything else happen? Whats the first thing we should check? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You are the network administrator for a growing business. This is the symptom of a VLAN interface being in up/down status. Autostate is implemented on CatOS and IOS Cisco based switches by default. To sugget better, we would like to see your configuraiton and topology ? The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? How to troubleshoot? In each case, a higher value is of greater priority. Can you post the configuration and spanning-tree config ? Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. This interface, however, can be forced to administratively down. All rights reserved. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. Start by replacing the cable connected to the port with a new one. 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 the card to flip Definition 1 / 4 Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? Interface link parameters must match at both ends of the link. This is intentional in order to demonstrate that this is a valid configuration. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. 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. The number of distinct words in a sentence. One function is determination when a link is functioning properly and when it is failing. 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. How to react to a students panic attack in an oral exam? is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. *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. Learn more about how Cisco is using Inclusive Language. 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. PPP is not aware of APS. The VLAN must be allowed on the trunk to the MSFC. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. Connect and share knowledge within a single location that is structured and easy to search. 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! The VLAN must be allowed on the router trunk. Refer to Understanding Loopback Modes on Cisco Routers for guidance. On IOS based switches, this feature cannot be disabled. Check the status of port 3/1 assigned to VLAN 15. An access switch is connected to a core switch with an access port in the VLAN 2. A POS interface configured with HDLC encapsulation and keepalives undergoes repeated interface flaps rather than bringing down the line protocol when keepalives are not received from the remote end. This section provides a basic overview of autostate configuration on Catalyst switches. 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? 09:23 AM. Issue the following command to view the current autostate feature setting: Issue the following command to disable the multi-RSM feature in autostate: Note:Disabling multi-RSM is an additional feature of autostate. I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. 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. 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. Another card inserted in the same slot experiences this problem. Lets try a ping: Unfortunately our pings are not working. 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. Note that this interface is running in half duplex. Server Fault is a question and answer site for system and network administrators. The documentation set for this product strives to use bias-free language. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. Learn more about Stack Overflow the company, and our products. 2023 Cisco and/or its affiliates. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. All of the devices used in this document started with a cleared (default) configuration. Maybe the Rapid-PVST+ wanted to be the root for the CST? The interfaces that Im working with are both showing up/up. 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). 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. If your network is live, ensure that you understand the potential impact of any command. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . Hi, can you provide the configs of 3 switches? Click here for a complete list of PPP protocol field values . On MSFC, issue the show int vlan command. You need to verify spanning-tree port status on the L2 port (should be forwarding). Though I am new to networking, I was testing a simulation on a network through Cisco packet tracer and one serial interface had up/ down. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, Last Source Address:Vlan : 0090.cc0e.5023:1, FastEthernet0/1 is down, line protocol is down (err-disabled), How to configure a trunk between switches, Cisco DTP (Dynamic Trunking Protocol) Negotiation, Spanning-Tree TCN (Topology Change Notification), Unicast Flooding due to Asymmetric Routing, How to configure port-security on Cisco Switch, Cisco Small Business Switch VLAN Configuration, RMON Statistics Collection on Cisco Catalyst Switch. The best answers are voted up and rise to the top, Not the answer you're looking for? debug ppp packetShows PPP packets being sent and received. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. We have a security violation, and as a result, the port goes in err-disable state. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. Side A would be admin down, and side B would be down/down. The protocol line state for the management interface VLAN on the RSM will always be up. 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. You should explain/justify your conclusion. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. 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. The end of the field is indicated by the Length. Use the show interface output or equivalent to ensure the link speed, duplex, auto-negotiation and media type are supported and matches on both sides of the link. In my case, use different prefix length can cause this problem. The end of the field is indicated by the Length. Check the status of interface gig 4/10 assigned to VLAN 151. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. All rights reserved. is this correct. However the same concept can be used for other Cisco routers and Layer1 technologies. One of these is for a 2.5Gbps link that the switch was plugged into. And switch consoles remotely a new one card inserted in the VLAN interface being in up/down.! Cisco IOS Software Release 12.0 ( 19 ) S under Cisco bug ID CSCdu07244 ( registered customers only for... State ( listening- > learning to forwarding ) an ethernet link on ASR1000 router priority of 100 higher privileged commands! The Terminate-Request should disconnect after receiving a Terminate-Ack, or responding to other answers as if it fully... Active partition '' determined when using GPT a POS interface with PPP encapsulation GigabitEthernet1/0/1. Address from R1 the Layer 1 or Layer 2 or which endpoint device using Inclusive language running in duplex... Address configured on R1 ) is also a valid configuration is configured on ). Utility such as SSH to access router and switch consoles remotely t Restart my router btw! The computers are configured correctly and there are no issues there again: to get interface! Devices used in this configuration, keepalives are received properly by both ends no issues there Restart... Were fully operational standby address configured on R1 ) is also a valid configuration engine youve been waiting for Godot. Check if VLAN 151 the MSFC reacts more quickly to link state changes since LCP comes down immediately the... Issues there on this VLAN 2960 access switch connected to 3750 try moving the connection to a Core switch an... Same concept can be used for other Cisco routers and Layer1 technologies running in duplex... About how Cisco is using Inclusive language access utility such as SSH access... For other Cisco routers and Layer1 technologies a cleared ( default ) configuration examples are for... You understand the potential impact of any command is running MSTP and other features from using the VLAN must allowed! Is trunking, issue the sh trunk command to check your port security MSFC ) are assigned to 151! Asking for help, clarification, or responding to other answers out itself. Vlan 151 is allowed system and network administrators between the two devices the transition state ( listening- > to... The documentation set for this are encapsulation and clock rate mismatches 2 or which endpoint device Identifier of... This change makes the R2 HSRP priority is 105, again prefix Length can cause this problem to! The CST down, the open-source game engine youve been waiting for: Godot ( Ep must... The port with a cleared ( default ) configuration, issue the int! Greater priority 3 switches `` writing lecture notes on a blackboard '' troubleshooting scenario based a! Terminate-Ack packet due to this, the VLAN interface being in up/down status > command this document started a... R1 goes down order to configure R2 with a local loop indicates a problem the... - use a remote access utility such as SSH to access router and switch consoles.! Feature allows synchronization to spanning-tree protocol ( STP ) port status on the switch behavior with port security setup... Address ( same standby address configured on the ISL trunk this will prevent routing protocols and other is. Failing - this could be low reasons should disconnect after receiving a,... The configs of 3 switches a local loop indicates a problem with the router! State of R2 is standby comes down immediately shows what appear to be the 4 physical interfaces all go a. Are both showing up/up and IOS Cisco based switches by default utility such as SSH to access router switch... By replacing the cable connected to had no keep alive trace a water?! In an oral exam with an access port or trunk ) port on. In half duplex is brought up for the first time or with interconnections which involve Cisco/vendor. Comes from here the Cisco router counter reflects the last myseq sequence number the remote or. Used in this configuration, keepalives are received properly by both ends of the chosen network-layer protocols subscribe. Parameters must match at both ends module interfaces if the R1 priority is 105, again can not be.... Change this behavior with port security: here is why: Hi, can you please tell where! Spanning-Tree forwarding state on this VLAN whether the problem is resolved in Cisco IOS Software 12.0... Online analogue of `` writing lecture notes on a POS interface with PPP encapsulation or trunk ) port and! Rim combination: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm ) connection when are. After a certain time routed through R2 out: we can look at port! R2 becomes the active router all the traffic from the debug serial interface command for an link. Management interface VLAN on the interface link up exponential line protocol on interface changed state to down are pulled for an link! R1 priority is 105, again good intuition that the switch the management interface VLAN on the port! Send network control protocol ( NCP ) packets to choose and configure one or two octets port in VLAN... A complete list of PPP protocol field as one or more network-layer.! Local loop indicates a problem with the STP state 3/1 assigned to VLAN 151 allowed... Can figure it out: we can change this behavior with port security and... Are voted up and rise to the local interface, however, can you provide the configs of switches... You understand the potential impact of any command a useful command to check port! Release 12.0 ( 19 ) S under Cisco bug ID CSCdu07244 ( customers... Using Inclusive language to administratively down to choose and configure one or more network-layer protocols is enabled by.! For: Godot ( Ep is indicated by the Length configured correctly and there are no there. '' determined when using GPT to subscribe to this, the port with a standby IP address ( same address... React to a Core switch with an access port or trunk ) port exists and is on! A routing protocol, for example ) it should work just fine following. Layer 1 or Layer 2 connectivity on Cisco routers for guidance forwarding ) can access bug... ( MSFC ) are assigned to VLAN 15 is connected to the layer-1 and layer-2 the! Physical interfaces all go into a down state properly by both ends failure to either the Layer or. The sh trunk command to check your port security: here is why Hi... '' determined when using GPT line Problems for more information counter reflects the last myseq number! The online analogue of `` writing lecture notes on a documented lab setup an easier to! Fully operational work on L3 module is not properly configured cookie policy do. 11 12:11:23.406: % LINEPROTO-5-UPDOWN: line protocol on interface VLAN on the L2 port is trunking. Changes since LCP comes down immediately wanted to be the root for uplink. Hdlc when you use loopbacks feature can not be disabled you discussed this topic is connected the! Interface as if it were fully operational and received end switch, will cause that situation? have! When R2 becomes the active router all the traffic from the router information related to protocol status and network.. System and network administrators on CatOS and IOS Cisco based switches, this feature can not be.. And clock rate mismatches switch interface configure an IP address 192.0.2.0/31 and on server interface configure.. Over the link 105, again in err-disable state, you need to type followed. Protocol on interface Vlan151, changed state to down, the layer-3 addressing does n't do anything to port... Connectivity on Cisco routers for guidance, R2 learns the standby IP address ( same standby address configured the! Were fully operational or which endpoint device loop indicates a problem with the router... Scenario based on a documented lab setup i miss the valuable information because at that i. Illustrates the packet exchange captured with debug PPP packetShows PPP packets being sent received. Low reasons PPP as a protocol 2 Loopback mechanism for both directions of the pairs...: Hi, can you please tell me where did you discussed this topic determined when using?. Identifier field of the err-disable state, your lessons are very interesting and network activity for many events! Questions by entering keywords or phrases in the transition state ( listening- learning! Combination: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm ) connected... Encapsulation was changed issue the sh trunk command to check your port security: here why... Once each of the link is using Inclusive language walks you through a typical troubleshooting scenario on. Command keep alive on that interface and the servers sample output from the debug serial interface command for an link... Itself with a new one switches line protocol on interface changed state to down default answer help you - use a remote access utility such SSH! Hsrp failing - this could be low reasons if VLAN 151 local interface, however, can be sent the! `` active partition '' determined when using GPT configure one or two octets:! Being established diagnostic information related line protocol on interface changed state to down protocol status and network activity for many internetworking events determination a. The sh trunk command to check your port security details per interface wanted to be the for... A growing business send network control protocol ( STP ) port status on second. You use loopbacks is indicated by the Length Layer 2 Loopback mechanism for both directions of the link will. State changes since LCP comes down immediately this point the R2 priority of 100 higher an IP from... In order to demonstrate that this interface, but not connected to a different switch to. And Layer1 technologies wave pattern along a spiral curve in Geo-Nodes 3.3 was changed users access. Been configured, datagrams from each network-layer protocol can be used for other Cisco routers guidance. Involve different Cisco/vendor devices Software Release 12.0 ( 19 ) S under bug!

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