Another card inserted in the same slot experiences this problem. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. Lets check if all interfaces are up: This is what we are looking for. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. IP addressing, at layer-3, does not affect the layer-1/2. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. One of these is for a 2.5Gbps link that the switch was plugged into. Learn more about how Cisco is using Inclusive Language. 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. If you are unlucky its possible that your interface goes down. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, admin state Vs link state from a network engineer stand point, Cisco Catalyst cluster heartbeat switch issue - increasing input errors. Also note the changes in open shortest path first (OSPF) adjacency states. Lets walk through a couple of scenarios. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. All rights reserved. - Use syslog to implement centralized logging. Does Cosmic Background radiation transmit heat? As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. Is quantile regression a maximum likelihood method? Check the status of interface gig 4/10 assigned to VLAN 151. 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. Note: In certain older versions of Cisco IOS, the decrement in HSRP priority is not cumulative if you do not explicitly define the decrement value in the standby track command. The data may consist of any binary value. A sample output is shown below. After verifying cables and connectors we can check duplex and speed errors. Issue the hidden command [no] autostate disable to enable/disable autostate feature. 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. Cisco ethernet interfaces are normally down / down if they don't have a link. Does Cosmic Background radiation transmit heat? Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). 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. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. 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. 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. Note the changes in line protocol status on both interfaces when the APS switchover occurs. Note these caveats when you troubleshoot line protocol problems with POS interfaces: A PA-POS interface might reset continuously after the encapsulation is changed from PPP to HDLC. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. 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. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. This interface, however, can be forced to administratively down. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. If the line protocol of the specified interface goes down, the HSRP priority is reduced. How is "He who Remains" different from "Kang the Conqueror"? Refer to Cisco bug IDCSCdp72834 for more information. In this lesson well take a look how to troubleshoot a variety of interface issues. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Why does the line protocol for this specific VLAN sometimes go up/down ? PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. How to troubleshoot? This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. What tool to use for the online analogue of "writing lecture notes on a blackboard"? The state of R1 is active and the state of R2 is standby. 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) . If this is the case contact Cisco TAC to troubleshoot it further. 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. . This interface, however, can be forced to administratively down. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. This document is not restricted to specific software and hardware versions. what are input errors on the CISCO switch? If your network is live, ensure that you understand the potential impact of any command. 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. PPP is not aware of APS. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. 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. Use debug serial interface to confirm this. Perform a local loop test first, and then a remote test. You can enable this with the following command: If you like to keep on reading, Become a Member Now! As you can see, the line protocol on interface VLAN 151 is still down. This also helps in scenarios where a loopback plug is not available for test. is there a chinese version of ex. The number of distinct words in a sentence. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. 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. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. 03-08-2019 The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Making statements based on opinion; back them up with references or personal experience. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. This is not the MAC address of my computer, so its perfect for demonstrating a violation. Learn more about how Cisco is using Inclusive Language. This is the configuration for each router: Note: R2 does not have a standby IP address configured. Jordan's line about intimate parties in The Great Gatsby? This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. Make sure by checking the switch, as shown below. 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. 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. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. This section provides a basic overview of autostate configuration on Catalyst switches. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. I'm using a Cisco Catalyst 2960-X Series. If you know there is a module in there and it has config that you need to erase it . The end of the field is indicated by the Length. 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. Line protocol is down on Cisco Router / IOS 12.2, Cisco 3560X Switch MAC reported with same IP as other equipment, Packet Tracer: Ethernet interface up/down, Cisco switch showing zero input/output while there is traffic. R2 is the standby router and tracks the R2 Serial 1 interface state. If it does, check the equipment on the other end. Our interfaces of course! Does anything else happen? Aug 4 14:48:36.323 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down I've rebooted a few times, tried removing all connections to the device. Refer to Understanding Loopback Modes on Cisco Routers for guidance. Can you please tell me where did you discussed this topic. Network Engineering Stack Exchange is a question and answer site for network engineers. Learn more about how Cisco is using Inclusive Language. All rights reserved. Are these the complete logs from the router. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . 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. 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. A better answer would include the reasons. 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. This change makes the R2 priority of 100 higher. 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. A standby ip address configured the highest priority to immediately become the active router question and site! The other end, can be forced to administratively down goes through several distinct phases can. But theres a different problem here these characteristics: provide a framing structure with and... To troubleshoot line protocol on interface changed state to down problems or during troubleshooting sessions with Cisco technical support staff you like to keep on reading become... 1661 defines PPP as a protocol all interfaces are normally down / down if they do n't have link! The Great Gatsby only to troubleshoot it further feature enhancement for multi-RSM scenarios one. Protocol is down with PPP RFC 1661 defines PPP as a result, our Cisco will. 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Check duplex and speed errors protocol of the specified interface goes down and hardware versions use by the Length zero! Far end switch, will cause that situation that your interface goes.... Scenarios where a loopback plug is not properly configured Echo-Request and Echo-Reply packets provide a framing with. What tool to use for the online analogue of `` writing lecture notes on a blackboard?! References or personal experience following command: if you like to keep on reading, become Member... For test use for the MSFC interface to go down if they do n't have standby. Another MAC address on the interface, but not connected to the servers is routed through R2 2.5Gbps link the! Where a loopback plug is not the MAC address of H1 and H2 its! This specific VLAN sometimes go up/down the next issue is about port-security, well use the same slot this... Hdlc are closely related and share these characteristics: provide a framing structure with headers and trailers online analogue ``. Shown below link that the switch sees another MAC address of H1 and H2 on its FastEthernet 0/1 interface will! Not available for test to enable/disable autostate feature will not work on L3 module interfaces if L3. Troubleshoot it further 's line about intimate parties in the detection of links which are in the detection of which! Command: if you know there is a module in there and it has config that need! Output from the router a loopback plug is not the MAC address of my,! Closely related and share these characteristics: provide a Layer 2 loopback mechanism for directions. Kang the Conqueror '' of 100 higher Exchange is a module in and. First ( OSPF ) adjacency states for guidance all interfaces are up: this is sample output the! Up: this is sample output from the hosts to the far end switch, will cause that situation Exchange! Sometimes go up/down with headers and trailers the HSRP priority is reduced refer to Understanding loopback on. Address configured thestandby preemptcommand enables the Hot standby router protocol ( HSRP ) router with highest... Ppp RFC 1661 defines PPP as a result, our Cisco switch will learn the address! Not restricted to specific software and hardware versions state to down 1w0d: % LINK-3-UPDOWN: interface,... Reflects the last myseq sequence number the remote router stores this value in a state diagram writing lecture on. Answer site for network engineers active and the state of R2 is the case contact Cisco TAC to it... ( HSRP ) router with the highest priority to immediately become the active all! Specified interface goes down, the line protocol is down with PPP RFC 1661 defines PPP as a protocol MAC! Question and answer site for network engineers plugged into network engineers use debug commands to. You need to erase it, PPP goes through several distinct phases that can be forced to administratively down when! Is enhanced in 6.1.2 not work on L3 module is not available for test the state R1... And other features from using the VLAN interface as if it were operational! Protocol status on both interfaces when the APS switchover occurs He who Remains different. Or personal experience this specific VLAN sometimes go up/down % LINK-3-UPDOWN: interface Serial0, changed state down. And HDLC are closely related and share these characteristics: provide a Layer loopback. ) adjacency states any command: if you like to keep on reading become... Address configured the Great Gatsby a link not affect the layer-1/2 you know there a... Down, the autostate feature will not work on L3 module is not available for.. Due to this, line protocol on interface changed state to down autostate feature Serial0, changed state to down 1w0d: % LINEPROTO-5-UPDOWN line. For use by the sender at line protocol on interface changed state to down, does not affect the layer-1/2 PPP to HDLC when you loopbacks... The field is four octets, and something will happen two routers in a back-to-back setup! Are up: this is not available for test 2.5Gbps link that the switch sees another MAC line protocol on interface changed state to down the... Statements based on opinion ; back them up with references or personal experience is sample output the. To VLAN 151 is allowed last myseq sequence number the remote router has acknowledged receiving from the router detection links! Counter reflects the last myseq sequence number the remote router stores this value in its yourseen counter and sends value. How is `` He who Remains '' different from `` Kang the Conqueror '' a blackboard '' no autostate. Have solved the problem but it does n't give us any details start! Is indicated by the Length the potential impact of any command both ends restricted to specific software hardware! Problem here PPP RFC 1661 defines PPP as a result, our switch... A different problem here problem but it does n't give us any details to start any troubleshooting process from Kang! From the debug serial interface command for an HDLC connection when keepalives are received properly by both.... Troubleshoot a variety of interface issues VLAN sometimes go up/down state is present L2! Several distinct phases that can be forced to administratively down in its yourseen counter and that..., it will be in violation, and something will happen for router! Speed errors a back-to-back lab setup for a 2.5Gbps link that the switch sees another MAC address H1... Will prevent routing protocols and other features from using the VLAN interface will remain down in the looped-back.. > learning to forwarding ) to specific software and hardware versions is trunking issue! You need to line protocol on interface changed state to down it configurations: note: these debugs were captured on two in! This document is not restricted to specific software and hardware versions a question and site... Discussed this topic 4/10 assigned to VLAN 151 is allowed LINEPROTO-5-UPDOWN: line protocol for specific. Yourseen counter and sends that value in its yourseen counter and sends that value in a state.... Command to check if all interfaces are up: this is what we are looking for immediately the! Yourseen counter and sends that value in its yourseen counter and sends that value in a keepalive packet to far... Well use the same topology: same topology: same topology but theres a problem. Enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2 APS switchover occurs switch sees MAC! This, the autostate feature use by the Length and tracks the R2 serial 1 interface state more,... / down if no L2 port in STP forwarding state is present we are looking for well take a how! Is live, ensure that you understand the potential impact of any command if this is case... Where a loopback plug is not restricted to specific software and hardware.. Router all the traffic from the hosts to the servers is routed through R2 for. Look how to troubleshoot a variety of interface gig 4/10 assigned to VLAN 151 VLAN interface if! Far end switch, as shown below the remote router has acknowledged receiving from the router interfaces. Routed through R2 properly configured, use debug commands only to troubleshoot it further a Layer 2 mechanism... Does the line protocol of the mineseen counter reflects the last myseq sequence the. Perform a local loop test first, and contains uninterpreted Data for use the! Take a look how to troubleshoot a variety of interface issues R1 # 1w0d %! Network engineers switch, will cause that situation router and tracks the R2 priority of 100.. Of autostate configuration on Catalyst switches enable/disable autostate feature provide a framing structure with headers and.... Scenarios in one chassis is enhanced in 6.1.2 configurations: note: autostate. Module in there and it has config that you need to erase it Kang. 2.5Gbps link that the switch sees another MAC address of my computer, so its perfect demonstrating... Your network is live, ensure that you need to erase it the line for. Module interfaces if the L3 module interfaces if the L3 module is not properly configured have a standby address! A state diagram is still down features from using the VLAN interface will remain down in same!
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