Server Fault is a question and answer site for system and network administrators. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! All of the devices used in this document started with a cleared (default) configuration. The documentation set for this product strives to use bias-free language. The data can consist of any binary value. There are many reasons why an interface does not come up on a cisco router. *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. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. Click here for a complete list of PPP protocol field values . Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. 10:59 AM. In my case, use different prefix length can cause this problem. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. rev2023.3.1.43268. Note:If autostate is enabled and there are no ports active on a specific VLAN in the switch, the interface on RSM remains up if there is more than one RSM. 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. Has Microsoft lowered its Windows 11 eligibility criteria? Note: FastEthernet interfaces by-definition can only test two of the four pairs. This should ring a couple of alarm bells (at least it means we are onto something). From the access switch, the uplink is always up. This is not the MAC address of my computer, so its perfect for demonstrating a violation. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. Autostate Configuration on Catalyst Switches, Catalyst 6000 Native IOS / Catalyst 4000 Cisco IOS (Supervisor III and IV) / Catalyst 3550, Catalyst 6000 Hybrid Running CatOS with MSFC card (SUP IA, SUP II, MSFC, MSFC 2), Catalyst 4000 (Supervisor I and II) with Layer 3 Modules, Troubleshooting the Autostate Feature on IOS Based Switches, Troubleshooting the Autostate Feature on CatOS Based Switches, Understanding and Configuring Spanning-Tree Protocol (STP) on Catalyst Switches, Technical Support & Documentation - Cisco Systems. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. This is intentional in order to demonstrate that this is a valid configuration. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. 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. 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. You can use the show standby command . If the Ping fails, it points to a cable or SFP problem. The VLAN must be allowed on the router trunk. 10:55 PM For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. 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. Learn more about how Cisco is using Inclusive Language. So I think it may affect layer 2. The data may consist of any binary value. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Refer to Troubleshooting Serial Line Problems for more information. The fault is likely at the remote end or an interoperability issue between the two devices. Change the cables and SFP. 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. You need to investigate why this line protocol is not up. 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. If they are not, a possible timing problem exists on the interface card or in the network. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. 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. When a higher priority router preempts a lower priority router, the router sends a Coup message. This debug captures the value of the protocol field in the PPP packet. When an external event, such as carrier detection or network administrator configuration, indicates that the physical layer is ready to be used, PPP proceeds to the link establishment phase. 10-02-2019 When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. Avoid configuring APS on a POS interface with PPP encapsulation. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? Duplex is on auto so that shouldnt be a problem. For more information on document conventions, see the Cisco Technical Tips Conventions. Learn more about how Cisco is using Inclusive Language. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. *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. upgrading to decora light switches- why left switch has white and black wire backstabbed? To use this feature, autostate must be enabled. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Configure the two ports/interfaces in two different VRFs and in the same subnet. Another card inserted in the same slot experiences this problem. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. If the problem persists, check other hardware components. All of the devices used in this document started with a cleared (default) configuration. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. Maybe the Rapid-PVST+ wanted to be the root for the CST? *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 . If you're seeing up / down, the most likely causes are: I haven't seen that recently. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. An access switch is connected to a core switch with an access port in the VLAN 2. You should explain/justify your conclusion. The best answers are voted up and rise to the top, Not the answer you're looking for? 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? how is these connected L2 ? At least one L2 port is in spanning-tree forwarding state on this VLAN. This is the symptom of a VLAN interface being in up/down status. If you are unlucky its possible that your interface goes down. 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. Configure the interface in local loopback. Lets take a closer look at it: Hmm it says err-disabled. 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. 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 interfaces that Im working with are both showing up/up. How is the "active partition" determined when using GPT? The Data field is zero or more octets, and contains uninterpreted data for use by the sender. The router is now looped back to itself. Asking for help, clarification, or responding to other answers. 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. 2023 Cisco and/or its affiliates. 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, but I need to know what the root cause of this problem, I have attached my router log. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? - VLAN exists in the vlan db and is active, - An access port is inside this VLAN and its status is always connected, - There is not entries regarding STP in the syslog, - There's no error (input, CRC, etc) when checking the interface counters. As you can see, it is now down. For retransmissions, the Identifier may remain unchanged. - Consolidate network resources down to one or two switches. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. If we want, we can change this behavior with port security. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. Thus, clocking is set to internal on one side and to default to line on the other end. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". Keepalives take longer to report a problem than the inherent SONET alarm structure. A better answer would include the reasons. 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. 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. 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. 10-02-2019 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Lastly, both routers are configured with the standby preempt command. The line protocol on the interface VLAN should now be up. %LINEPROTO. Let's take a closer look at port security: POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. This change makes the R2 priority of 100 higher. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. Troubleshoot. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. 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. Try moving the connection to a different switch port to see whether the problem follows the move. The information presented in this document was created from devices in a specific lab environment. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! For the purposes of document, the output of show interface pos is as this output shows. Would the reflected sun's radiation melt ice in LEO? The last MAC address seen on the interface is 000c.2928.5c6c. I'm using a Cisco Catalyst 2960-X Series. Thats looking better! Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. No, it is point-to-point at layer-3. For these switches, the autostate feature is enabled by default. On these switches, the autostate feature is enabled by default and can be disabled. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . The documentation set for this product strives to use bias-free language. Refer toCisco Technical Tips Conventions for more information on document conventions. It also walks you through a typical troubleshooting scenario based on a documented lab setup. Changing it to auto-speed brings back the interface to the land of the living. Hi, can you provide the configs of 3 switches? Lets try another ping (maybe we get lucky): Too bad, the ping is not working. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. Spanning-tree port status on the L2 port is forwarding. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. keepaliveIndicates whether keepalives are set. 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 sc0 should always be up after the switch boots. 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. Is quantile regression a maximum likelihood method? At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. This interface, however, can be forced to administratively down. is this correct. 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. Does anything else happen? In this example we have a switch in the middle and two computers that are connected to it. 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. Cisco ethernet interfaces are normally down / down if they don't have a link. Regarding to the second question: What if the cable is good? This output illustrates the packet exchange captured with debug ppp packet while a link is being established. 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 trailer provides error checking. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Also, is there any history somewhere that records the changes of states of the ports (ie. 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. - Use a remote access utility such as SSH to access router and switch consoles remotely. Spanning-tree port status is in listening yet. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Refer to bug ID CSCdu05914 (registered customers only) for more information. Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. No, it is point-to-point at layer-3. Connect and share knowledge within a single location that is structured and easy to search. The VLAN must be allowed on the trunk to the MSFC. To find the supported transceivers for the interface module used follow the link. 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. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. 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 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. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. Whats the first thing we should check? The sc0 should always be up after the switch boots. If your network is live, ensure that you understand the potential impact of any command.
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