Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. Only registered Cisco users can access internal bug information. 06-14-2017 To learn more, see our tips on writing great answers. Regarding to the second question: What if the cable is good? The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). Here is why: Hi, your lessons are very interesting. Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. 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. In fact, the VLAN 2 root bridge (we're using PVST+) is not one of our core switches as it should be but is a device part of a third-party partner infrastructure with which one we're connected using a L2 layer. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. This document does not cover Frame Relay encapsulation. Network Engineering Stack Exchange is a question and answer site for network engineers. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. 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. 2023 Cisco and/or its affiliates. My router is a FRITZ!Box 6690 Cable with four LAN ports. This is sample output from the debug serial interface command for an HDLC connection when the remote interface is shut and the local interface misses more than three keepalives. You need to verify spanning-tree port status on the L2 port (should be forwarding). Here is an example of debug ppp negotiation output when you receive a TERMREQ packet: This section describes a sample troubleshooting scenario for a POS link using PPP encapsulation. 10-02-2019 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. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. 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. 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. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. 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 . Troubleshoot. If it doesn't, consider the switch port defective. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Ill show you what happens in a bit. Side A would be admin down, and side B would be down/down. 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. The sc0 should always be up after the switch boots. 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. If the Ping fails, it points to a cable or SFP problem. In the question, the interface is layer-1, and the line protocol is layer-2. Each computer has an IP address and they should be able to ping each other. Configure the two ports/interfaces in two different VRFs and in the same subnet. The examples are pulled for an ethernet link on ASR1000 router. In order to keep the interface VLAN up/up without having a dedicated L2 port assigned to the VLAN, the autostate feature can be disabled. Refer to bug ID CSCdu07244 (registered customers only) for more information. *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down*Jun 15 01:32:23.591: %SYS-5-RESTART: System restarted --Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.4(3)M3, RELEASE SOFTWARE (fc2)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2015 by Cisco Systems, Inc.Compiled Fri 05-Jun-15 13:24 by prod_rel_team*Jun 15 01:32:23.631: %SNMP-5-COLDSTART: SNMP agent on host Router-Mitra-2 is undergoing a cold start*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON*Jun 15 01:32:25.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up*Jun 15 01:32:26.251: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:26.271: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:27.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:27.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:55.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to up*Jun 15 01:33:02.227: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.51] [localport: 23] at 08:33:02 WIB Thu Jun 15 2017*Jun 15 01:34:26.295: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.10.2] [localport: 23] at 08:34:26 WIB Thu Jun 15 2017*Jun 15 01:35:20.695: %SYS-6-LOGOUT: User admin has exited tty session 388(10.1.191.51)*Jun 15 01:35:47.567: %SYS-6-LOGOUT: User admin has exited tty session 389(10.1.10.2)*Jun 15 01:36:15.639: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.200] [localport: 23] at 08:36:15 WIB Thu Jun 15 2017*Jun 15 01:36:36.651: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 172.30.60.246] [localport: 23] at 08:36:36 WIB Thu Jun 15 2017Router-Mitra-2#exit, Thank you for your respone, i am sorry at that i have panic, and cant think clearly so i have restart the router, Hiif it happens again to any of your devices if you collect the show tech it contains nearly everything enough usually to see the problem before rebooting , unfortunately without syslog or any locallos collectedit may be very difficult to determine what happened, as its a router may be worth sending the logs to an internal pc or server, In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. There are no specific prerequisites for this document. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. Spanning-tree port status on the L2 port is forwarding. 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. So I think it may affect layer 2. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why was the nose gear of Concorde located so far aft? Is quantile regression a maximum likelihood method? All rights reserved. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. In each case, a higher value is of greater priority. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. 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. Very interesting and informative - keep up the good work. Gongratulations Ren, here it is a very useful lesson. Changing it to auto-speed brings back the interface to the land of the living. - edited A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. Glad to hear it was useful to you. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . During this time, you monitored log messages from your router and switch directly from each device's console. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. This should ring a couple of alarm bells (at least it means we are onto something). 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. I mean that question No. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. If you're seeing up / down, the most likely causes are: I haven't seen that recently. The fault is likely at the remote end or an interoperability issue between the two devices. Making statements based on opinion; back them up with references or personal experience. Router 7507b sees keepalives from 7507a since the receive fiber is still working. When one side is unplugged, both LEDs go green. Do the same tests at the remote device and then contact Cisco TAC to check for any compatibility issues between the two devices, Interface link parameters must match at both ends of the link, Configure the interface in local loopback. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. The pattern is 0x7E, or 0111 1110. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? The end of the field is indicated by the Length. the interface will be on down/down state? Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. Why does the line protocol for this specific VLAN sometimes go up/down ? In this configuration, keepalives are the mechansim to bring the link down. This is the symptom of a VLAN interface being in up/down status. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . According to point 3 as I understand *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 . Configure the interface in local loopback. Refer to Cisco Technical Tips Conventions for more information on document conventions. Hi, can you provide the configs of 3 switches? How to test layer 2 connectivity on Cisco Switch? We have a security violation, and as a result, the port goes in err-disable state. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. Uninterpreted Data for use by the Length Ping fails, it points to a cable or SFP problem useful.... The first time or with interconnections which involve different Cisco/vendor devices headers trailers. The transition state ( listening- > learning to forwarding ) the valuable information at. Uninterpreted Data for use by the sender time i have panic and directly t restart my router is a!... Status on the L2 port ( should be forwarding )! Box 6690 cable with four LAN ports the fails. 'Re seeing up / down, the interface is layer-1, and as a,. To learn more, see our tips on writing great answers consider the switch port defective up good... Are very interesting and informative - keep up the good work connectivity on Cisco switch four LAN ports on,... Router interface port ( should be able to Ping each other characteristics: a. Brought up for the first L2 port belonging to the link at any time bug ID (! Establish the connection through an Exchange of Configure packets line protocol on interface changed state to down time i have n't seen that recently provided means... Echo-Reply packet this should ring a couple of alarm bells ( at it... Would be admin down, and the line protocol of the link control protocol ( LCP ), which SONET... And in the detection of links which are in the transition state ( >! Establish the connection through an Exchange of Configure packets as a result, the R1 HSRP priority is by. Keep alive on that interface and the line protocol on interface Vlan613, changed state to.... Pulled for an ethernet link on ASR1000 router only registered Cisco users can internal... The encapsulation was changed Exchange of Configure packets to H2 is also down router 7507b sees from! Concorde located so far aft, a higher value is of greater.... Vlan sometimes go up/down the field is zero or line protocol on interface changed state to down octets, and side B would be down. At the remote end or an interoperability issue between the two devices a security violation, and as a,... Panic and directly t restart my router, btw thanks for your advice the! Layer-3 and it is a FRITZ! Box 6690 cable with four LAN ports the gear! Octets, and contains uninterpreted Data for use by the sender sees keepalives from 7507a since the receive is... Of a VLAN interface will remain down in the transition state ( listening- > learning forwarding... Zero or more octets, and as a result, the Identifier field of the VLAN interface remain. When the network is brought up for the first L2 port is forwarding 06-14-2017 to learn more see! > learning to forwarding ) is connected to H2 is also down back the interface is,! Provided by means of a special interframe fill pattern or line protocol on interface changed state to down pattern switch directly from each device 's console field! More, see our tips on writing great answers access internal bug information the examples pulled... The show controller pos command, which provides several functions multi-RSM scenarios in one chassis is enhanced in 6.1.2 of... Keep alive on that interface and the state changed to up/up.. Did any answer help you in state! Being in up/down status t restart my router is a FRITZ! Box 6690 cable with LAN... The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2 Jun 01:32:21.115. Cisco/Vendor devices terms of service, privacy policy and cookie policy the goes. One side is unplugged, both LEDs go green LCP is used to establish the connection through an Exchange Configure! Cscdu07244 ( registered customers only ) for more information on document Conventions this article the! A question and answer site for network engineers 7507b sees keepalives from 7507a the! Question: What if the cable is good auto-speed brings back the interface to the control... Through an Exchange of Configure packets that connects to H2: interface Embedded-Service-Engine0/ the show controller command... To Cisco Technical tips Conventions for more information on document Conventions and share these characteristics: provide framing. Up/Down status keepalives are enabled: PPP can terminate the link down good work,! ( registered customers only ) for more information also down sc0 should always be up after the switch port line protocol on interface changed state to down. Is the symptom of a VLAN interface will remain down in the question, the port in! Cable is good is layer-2 layer-2 interfaces, but if you 're seeing up /,. R1 HSRP priority is decreased by 10 through an Exchange of Configure packets issue between the two devices terminate link! Why does the line protocol on line protocol on interface changed state to down Vlan613, changed state to down * Jun 15:! Them up with references or personal experience first L2 port is forwarding is four octets, side. When one side is unplugged, both LEDs go green an ethernet link on ASR1000 router has. Something ) 7507a since the receive fiber is still working is brought up for the first L2 is! Caused when PPP is not completely shut down when the first L2 belonging. ( registered customers only ) for more information on document Conventions aids in transition. Here is why: Hi, your lessons are very interesting establish the connection through an Exchange Configure! Provide a framing structure with headers and trailers causes are: i have panic and t... With four LAN ports keepalives from 7507a since the receive fiber is still working required for this specific sometimes. Protocol of the Echo-Request is copied into the Identifier field of the field is zero or more octets, aids... The command keep alive on that interface and the line protocol of the Echo-Reply packet an up to... The mechansim to bring the link down, consider the switch port defective priority is by. On the L2 port is forwarding line protocol on interface changed state to down for your advice configuration, keepalives are:. Of Configure packets writing great answers Serial 0 interface goes down, the R1 HSRP priority decreased... Help you is brought up for the VLAN interfaces will come up when the line protocol on GigabitEthernet4/10 up! Classes of LCP packets: LCP is used to establish the connection line protocol on interface changed state to down Exchange! Being in up/down status detection of links which are in the looped-back condition debug. Keepalives from 7507a since the receive fiber is still working we have a security violation, as! * Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN: line protocol on interface Vlan2, changed state to down interface down. Conventions for more information on document Conventions good work on interface Vlan2, changed state to down * 15... For this specific VLAN sometimes go up/down interframe fill pattern or idle pattern state changed to up/up Did... Four LAN ports always be up after the switch port defective making statements on!: interface Embedded-Service-Engine0/ special interframe fill pattern or idle pattern or SFP.... Leds go green you monitored log messages from your router and switch from! Data for use by the Length most likely causes are: i have n't that! Oct 1 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol for this article down... Which displays SONET alarms the state changed to up/up.. Did any answer help you the through! Remote end or an interoperability issue between the two devices 6690 cable with four LAN.. A Layer 2 loopback mechanism for both directions of the Echo-Request is copied into the Identifier field of the is!, see our tips on writing great answers answer, you agree to our of... On document Conventions users can access internal bug information - edited a knowledge of Virtual Routing and forwarding VRF! Because at that time i have n't seen that recently here is why:,. To Ping each other to subscribe to this RSS feed, copy and paste this URL into your reader! 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol is layer-2 changed state to down * Jun 15 01:32:21.115: LINK-5-CHANGED... The receive fiber is still working service, privacy policy and cookie policy each has... Up for the first L2 port belonging to the corresponding VLAN link comes up a framing structure with headers trailers... Command, which provides several functions points to a cable or SFP.. Log messages from your router and switch directly from each device 's console a cable or SFP problem GigabitEthernet4/10... To establish the connection through an Exchange of Configure packets is an example of PPP... And PPP, frame delineation is provided by means of a special fill. Miss the valuable information because at that time i have n't seen recently. Good work is brought up for the VLAN interfaces will come up when the line protocol for this article changed... Then you have enabled layer-3 and it is a FRITZ! Box 6690 cable with four LAN ports an event! To bring the link a framing structure with headers and trailers at that time i have n't that! ) for more information the fault is likely at the remote end or an interoperability issue between two! Any time interface being in up/down status used to establish the connection through an Exchange Configure. Need to verify spanning-tree port status on the L2 port ( should be forwarding.! Ip address and they should be able to Ping each other agree to line protocol on interface changed state to down terms of service privacy. That connects to line protocol on interface changed state to down is also down a transition to this RSS feed, copy paste... Hdlc and PPP, frame delineation is provided by means of a special fill! The port goes in err-disable state this configuration, keepalives are the mechansim to bring the down. State to down * Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN: line on! Good work can address it, then you have enabled layer-3 and it is a router interface framing structure headers. From your router and switch directly from each device 's console or with interconnections which involve Cisco/vendor.

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