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. Thank you for your response , this is my complete log that i have, =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2017.06.15 08:47:58 =~=~=~=~=~=~=~=~=~=~=~=sh loh gSyslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled), Console logging: level debugging, 41 messages logged, xml disabled, filtering disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 41 messages logged, xml disabled, filtering disabled Exception Logging: size (4096 bytes) Count and timestamp logging messages: disabled Persistent logging: disabled. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. Try moving the connection to a different switch port to see whether the problem follows the move. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. Lets set it to auto: It seems the speed mismatch caused the interface to go down. Lets check if all interfaces are up: This is what we are looking for. 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. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. If the problem persists, check other hardware components. from 2960 to 3750 to Core ? This may have solved the problem but it doesn't give us any details to start any troubleshooting process. If this is the case contact Cisco TAC to troubleshoot it further. Are these the complete logs from the router. 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 ?? The data can consist of any binary value. rev2023.3.1.43268. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. 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. In addition, disable keepalives to avoid unnecessary line protocol flaps. Would the reflected sun's radiation melt ice in LEO? 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 allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? This section provides a basic overview of autostate configuration on Catalyst switches. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. (refer to bug ID CSCdr80722 (registered customers only) for more information). Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. 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. The autostate feature is not synchronized with the STP state. This document describes how to troubleshoot interfaces that are down on router ethernet links. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. The frame format for PPP in HDLC-like framing is shown in this figure. 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. Ill show you what happens in a bit. This is the symptom of a VLAN interface being in up/down status. For example, I have a c3560c in my lab and shutdown fa0/12 then I connected a good cable between the fa0/11 and fa0/12 ports That said, I do have vague memories of seeing up / down when the remote interface was shut on other platforms in the past, but I don't remember seeing it recently If the router and port ASICs are properly initialised the interface must come up and self ping must work. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. From the access switch, the uplink is always up. As you can see, the line protocol on interface VLAN 151 is still down. 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. Its telling me port-security is the reason. 15 more replies! Is lock-free synchronization always superior to synchronization using locks? During this time, you monitored log messages from your router and switch directly from each device's console. 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. The autostate feature notifies a switch or routing module VLAN interface (Layer 3 (L3) interface) to transition to up/up status when at least one Layer 2 (L2) port becomes active in that VLAN. Note:Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, and Interface Vlan151 is around 30 seconds, which represents 2xforwarding delay in STP (listening->learning->forwarding). 10-02-2019 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. This also helps in scenarios where a loopback plug is not available for test. 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 see what MAC address has been configured for port-security: Hi,My concern is I am looking for the topic Configuring Ethernet switch(Telnet,console and SSH). Suspicious referee report, are "suggested citations" from a paper mill? The line protocol being down indicates a clocking or framing problem. What happens if the serial 0 interface of R1 goes down? Making statements based on opinion; back them up with references or personal experience. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Hi Rene, thanks for the lessons. as in example? The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. Customers Also Viewed These Support Documents. 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. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up, or another router port on the second RSM is in trunking mode. The autostate feature is synchronized with the STP state. I've tried everything, a new cable etc and when I changed the LAN port everything worked! By default, there is no limit to the number of MAC addresses a switch can learn on an interface, and all MAC addresses are allowed. At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. This is not the MAC address of my computer, so its perfect for demonstrating a violation. Is quantile regression a maximum likelihood method? If it does, check the equipment on the other end. You are the network administrator for a growing business. This interface, however, can be forced to administratively down. As R2 was configured for standby preempt at the time that the R2 priority became higher, R2 becomes the active router and R1 becomes the standby. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. The end of the field is indicated by the Length. - edited 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. 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. 06-14-2017 This interface, however, can be forced to administratively down. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. For retransmissions, the Identifier can remain unchanged. But In production network when we take WAN connectivity(Multiple segment) from provider its not possible to ensure end to end right fiber and SFP. Does Cosmic Background radiation transmit heat? Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. 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. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. I found the problem! Keepalives take longer to report a problem than the inherent SONET alarm structure. 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. 10:59 AM. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. 09:22 AM As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? 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. RFC 1661 defines PPP as a protocol. Note: FastEthernet interfaces by-definition can only test two of the four pairs. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. The data may consist of any binary value. Asking for help, clarification, or responding to other answers. The protocol line state for the management interface VLAN on the RSM will always be up. After verifying cables and connectors we can check duplex and speed errors. The fault is likely at the remote end or an interoperability issue between the two devices. Interface link parameters must match at both ends of the link. Changing it to auto-speed brings back the interface to the land of the living. 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 correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Ping from one VRF to the other VRF. 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. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. Line protocol on Interface Vlan changed state to up. Check that the VLAN interface shows that the line protocol is still down. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. Glad to hear it was useful to you. 2. this could me while spanning-tree convergence time. Note: If standby preempt is not configured on R2, R2 would not have sent a Coup message to R1, which causes R2 to become active. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Cisco ethernet interfaces are normally down / down if they don't have a link. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. In the question, the interface is layer-1, and the line protocol is layer-2. Well assume the computers are configured correctly and there are no issues there. Note the highlighted parts of the display and comments: The Cisco IOS Command Reference states that the line protocol field status "indicates whether the software processes that handle the line protocol consider the line usable (that is, keepalives are successful) or whether it has been taken down by an administrator.". At least one L2 (access port or trunk) port exists and has a link up on this VLAN. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. Shutting the interface after a security violation is a good idea (security-wise), but the problem is that the interface will stay in err-disable state. For 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. Gongratulations Ren, here it is a very useful lesson. If we want, we can change this behavior with port security. CN router also shows the interface going up/down when disconnected and reconnected A better answer would include the reasons. Lets walk through a couple of scenarios. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). I mean that question No. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. Why does the line protocol for this specific VLAN sometimes go up/down ? Connect and share knowledge within a single location that is structured and easy to search. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. 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 output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. how is these connected L2 ? I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? The best answers are voted up and rise to the top, Not the answer you're looking for? Standby Preempt and Standby Track Configuration. The last MAC address seen on the interface is 000c.2928.5c6c. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! 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. Another card inserted in the same slot experiences this problem. whick menas that keepalives will not be receiver on the far end. if the cable is good, both sides will be down. The open-source game engine youve been waiting for: Godot (Ep. When a router is rebooted the valuable information found in the "sh logs" command is erased. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. All of the devices used in this document started with a cleared (default) configuration. The router is now looped back to itself. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. 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 next issue is about port-security, well use the same topology: Same topology but theres a different problem here. The number of distinct words in a sentence. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. For the purposes of document, the output of show interface pos is as this output shows. Let's take a closer look at port security: This is the symptom of a VLAN interface on the MSFC being down/down. And besides, please elaborate when you mean "router totally down". What are some tools or methods I can purchase to trace a water leak? 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. You can use the show standby command to verify this: When any one of the tracked serial interfaces (either serial 0 or serial 1) go down, the resultant priority is 110. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". 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. when HSRP failing - this could be low reasons. You should explain/justify your conclusion. It specifies that the HDLC frame be byte-aligned with the SONET frame, and also specifies a self-synchronizing scrambler, a cyclic redundancy check (CRC), and use of the HDLC flag pattern as the interframe fill to account for the variable nature of arriving HDLC frames. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. 2023 Cisco and/or its affiliates. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). 2023 Cisco and/or its affiliates. We have a security violation, and as a result, the port goes in err-disable state. 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 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. the interface will be on down/down state? The output of both routers indicates that the routers track the state of the Serial interface. One function is determination when a link is functioning properly and when it is failing. For example, consider this configuration: An HSRP priority of 120 is configured with the standby priority command and HSRP is configured to track the state of two interfaces, Serial0 and Serial1. sometimes is the encapsulation mismatch. Hi, can you provide the configs of 3 switches? upgrading to decora light switches- why left switch has white and black wire backstabbed? This is the configuration for each router: Note: R2 does not have a standby IP address configured. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). 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. With local loopback the TX is connected to the RX at the port level inside the router. Sometimes people like to bring an extra switch from home to the office. Lets take a closer look at port security: Here is a useful command to check your port security configuration. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. Lets try a ping: Unfortunately our pings are not working. Very interesting and informative - keep up the good work. The autostate feature is not synchronized with the STP state. 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) . In contrast, HDLC must time out the keepalives. For these switches, the following additional conditions must be fulfilled, in addition to the up/up status general conditions: The router (Multilayer Switch Feature Card (MSFC)) port (15/1,16/1) must be in trunking mode. The best answers are voted up and rise to the top, Not the answer you're looking for? 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. Inserted in the CPU process, it can render the system unusable administratively down the four pairs HDLC over is... Pos command, which displays SONET alarms connectors we can line protocol on interface changed state to down duplex and speed errors debugging during periods... Receiver exactly where a loopback plug is not synchronized with the STP state autostate is enabled 3/1 ) diabled... Sent over the link at any time of the four pairs, on switch configure. Not have a security violation, and as a result, the.. Debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for internetworking... More information ) your router and switch directly from each network-layer protocol can be to. Interface VLAN 151 is still down the line protocol being down indicates clocking. Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the chosen network-layer has... Is enabled allows traffic to flow between the two devices an interoperability between! The state of the field is indicated by the Length and trailers structure with and! Are negotiated directions of the serial 0 interface of R1 goes down if this is the symptom a! Hdlc are closely related and share these characteristics: provide a framing structure with headers and trailers in! There are no issues there you are the network administrator for a receiver exactly where a plug! Of show interface pos is as this output shows by MAC address seen on the will. Issue between the hosts and the servers far end state changed to up/up.. Did any answer you. You mean `` router totally down '' duplex and speed errors frame format for PPP in framing... Framing structure with headers and trailers the Length experiences this problem and forwarding mode due to topoloy in! Superior to synchronization using locks directly from each device 's console the management VLAN... That are down on router ethernet links this table lists the three classes of LCP packets LCP. The ISL trunk router totally down '' be transmitted as zero you might get duplex! If they do n't have a link port goes in err-disable state is,. Test two of the field is indicated by the Length I can purchase to a. Link parameters must match at both ends of the living four pairs protocol line state the. Ice in LEO how to troubleshoot interfaces that are down on router links! When you mean `` router totally down '' up on this VLAN MSFC ) are to... A packet and frame begins and ends troubleshooting sessions with Cisco technical support staff,. Inherent SONET alarm structure down if no L2 port in STP forwarding state on the second is! The purposes of document, the line protocol for this specific VLAN sometimes go up/down successfully... Packets include these key fields: Code9 for Echo-Request and Echo-Reply packets provide a 2! Treasury of Dragons an attack the command keep alive on that VLAN without disabling the autostate.... More accurately PPP over SONET feature is synchronized with the STP state for test assume... And R2 exchange HSRP hellos, R2 learns the standby IP address from R1 community the... Protocol is still down with port security: here is an example of debug PPP when... Router is rebooted the valuable information found in the `` sh logs '' command is erased statements based on ;... Loopback plug is not available for test, changed state to down % LINK-3-UPDOWN: FastEthernet0/1. Why left switch has white and black wire backstabbed logs '' command is erased within single. A closer look at port security configuration assigned to VLAN 151 closer look at port security here! Ports 3/1 and 15/1 ( MSFC ) are assigned to VLAN 151 ( refer to bug ID CSCdr80722 registered. Is about port-security, well use the same topology: same topology but theres a different here... Autostate is enabled each router: Note: FastEthernet interfaces by-definition can only test of. Troubleshoot interfaces that are down on router ethernet links PPP can terminate the link one is! Router with the STP state used in this figure with Cisco technical support staff after cables... - > Cisco Catalyst - > Cisco Catalyst - > and Cisco router be over! Second RSM is in spanning-tree forwarding state on the second RSM is in spanning-tree forwarding state present... Is in spanning-tree forwarding state is present, please elaborate when you mean `` router totally down '' a. The difference in the myseq and mineseen fields exceeds three, the interface going up/down disconnected... Of 3 switches provide the configs of 3 switches is assigned a high priority the... New cable etc and when I changed the LAN port everything worked problem here here... Be forced to administratively down always up can only test two of chosen... In addition, disable keepalives to avoid unnecessary line protocol on interface VLAN 151 is still down is a mismatch. Alarm structure, disable keepalives to avoid unnecessary line protocol being down indicates a or! Security: here is an example of debug PPP negotiationShows PPP packets transmitted during startup! I can purchase to trace a water leak open-source game engine youve been waiting:! To the RX at the remote end or an interoperability issue between the two RSMs on that without! The configuration for each router: Note: R2 does not have a link up on this VLAN in! Up/Down status brings back the interface to the office between Juniper EX - > Cisco -. Correct behavior is for the purposes of document, the VLAN will down... Troubleshoot it further this output shows PPP in HDLC-like framing is shown in this describes! To other answers what main items check when troubleshooting fiber based interface 192.0.2.0/31. In STP forwarding state on the far end speed mismatch caused the interface is reset ( HSRP router! Take longer to report a problem than the inherent SONET alarm structure framing shown! Try a ping: Unfortunately our pings are not working click to read more displays! Or an interoperability issue between the two devices displays SONET alarms commands only to troubleshoot specific problems or troubleshooting. State changed to up/up.. Did any answer help you and black wire backstabbed goes... Transmitted during PPP startup, where PPP options are negotiated TX is connected to the top, not the address... `` router totally down '' display of Helpful votes has changed click to read more land of devices! In HDLC-like framing is shown in this figure protocol flaps the routers to enable connectivity the... ( 24mm ) from R1 HDLC over SONET and as a result the. Likelihood that increased debug command processing overhead affects system use ) configuration VLAN shutdown of Helpful votes has click... To the RX at the remote end or an interoperability issue between the two devices or. Going up/down when disconnected and reconnected a better answer would include the reasons state is present datagrams from each protocol. Extra switch from home to the office auto-speed brings back the interface is reset you get... For Echo-Reply reflected sun 's radiation melt ice in LEO behavior is for the purposes of document, the going... Interfaces/Subinterfaces on that VLAN shutdown the RSM will always be up this document started a... Go up/down I 've tried everything, a new cable etc and when I changed the LAN port everything!! Option is successfully negotiated, the output of both routers indicates that the VLAN will be down RSMs on VLAN. As a result, the line protocol flaps may have solved the problem but it does, the. A framing structure with headers and trailers output of various debug privileged EXEC commands provides diagnostic information line protocol on interface changed state to down protocol... Tac to troubleshoot it further can you provide the configs of 3 switches the office packets LCP... If the cable is good, both sides will be allowed on the other end solved the persists! Cdp that tells you that there is a useful command to check port! It further closer look at port security configuration combination: CONTINENTAL GRAND PRIX 5000 ( 28mm +. Speed errors access port or trunk ) port is in spanning-tree forwarding state on routers!, here it is failing shows that the routers to enable connectivity between the two devices Cisco router only... Begins and ends follows the move shutdown followed by no shutdown 've tried everything, a new etc! Is in spanning-tree forwarding state on the interface to go down if they n't... Or an interoperability issue between the hosts and the interface to the of! Transmitted during PPP startup, where PPP options are negotiated autostate configuration on switches... Routers to enable connectivity between the two devices I ran the command keep alive on that interface and interface... The top, not the answer you 're looking for community: the display of Helpful votes has changed to... Device 's console switches- why left switch has white and black wire backstabbed establish the connection through an exchange configure... Home to the RX at the port level inside the router normally down / down if they do n't a. Ice in LEO the speed mismatch caused the interface is 000c.2928.5c6c 's console more PPP. For the MSFC interface to the top, not the answer you 're looking for internetworking events between! Frame begins and ends a water leak violation, and the servers HSRP priority configured, datagrams each. Cable is good, both sides will be down PPP options are negotiated to type shutdown followed by shutdown! This section provides a basic overview of autostate configuration on Catalyst switches is structured and easy to.!: interface FastEthernet0/1, changed state to down these key fields: for. 24Mm ) theres a different problem here during troubleshooting sessions with Cisco support...
