We have a security violation, and as a result, the port goes in err-disable state. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. Ping from one VRF to the other VRF. 06-14-2017 Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. Refer toCisco Technical Tips Conventions for more information on document conventions. The frame format for PPP in HDLC-like framing is shown in this figure. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. If the router and port ASICs are properly initialised the interface must come up and self ping must work. If you have a Cisco switch, you can test your cabling on the up / down interface like this the following is good tdr output for the command when nothing is connected to the other end of the cable. Issue the following command to see what Catalyst 4000 L3 services module interfaces have been shut down or brought up by the autostate feature: Issue the following command to disable the autostate feature (this is a hidden command): Issue the following command to re-enable the autostate feature: Perform these troubleshooting steps if the VLAN interface is down. Each computer has an IP address and they should be able to ping each other. You should explain/justify your conclusion. FWD to BLK) ? 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. The protocol line state for the VLAN interfaces will come up when the first L2 port (non-router port, that is, not 15/1 or 16/1) belonging to the corresponding VLAN link comes up and is in spanning-treeforwarding state. 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. *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. For retransmissions, the Identifier may remain unchanged. Learn more about how Cisco is using Inclusive Language. Can you please tell me where did you discussed this topic. 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. A better answer would include the reasons. 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. You need to investigate why this line protocol is not up. Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. Perform a local loop test first, and then a remote test. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . If the problem persists, check other hardware components. 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. 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. 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. So I have a good intuition that the issues comes from here. For more information on document conventions, see the Cisco Technical Tips Conventions. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. 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. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Technical Support & Documentation - Cisco Systems. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. Lastly, both routers are configured with the standby preempt command. Note: The default gateway for Hosts 1, 2, and 3 is configured with the HSRP virtual IP address (172.16.6.100, in this case). 2023 Cisco and/or its affiliates. 03-08-2019 How to test layer 2 connectivity on Cisco Switch? 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. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. Sometimes people like to bring an extra switch from home to the office. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. The best answers are voted up and rise to the top, Not the answer you're looking for? What happens if the serial 0 interface of R1 goes down? sometimes is the encapsulation mismatch. Check that the VLAN interface shows that the line protocol is still down. However the interface exists even if the module isn't present. In the question, the interface is layer-1, and the line protocol is layer-2. A statement without backup is typically suspect. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. Consider the following log message generated by a router: *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . Does Cosmic Background radiation transmit heat? When a router is rebooted the valuable information found in the "sh logs" command is erased. Thanks, 66 more replies! 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 is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. 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. Cisco Switch Out-Of-Box without console access, How to configure a Cisco Catalyst 2960 to synchronize with an NTP server, Add non-flex switch to existing switch stack, Unplug of Netgear Switch Causes Cisco Link Drop on Remote Switch, Is email scraping still a thing for spammers. This document describes how to troubleshoot interfaces that are down on router ethernet links. One of these is for a 2.5Gbps link that the switch was plugged into. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. If you are unlucky its possible that your interface goes down. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. The command below shows that the VLAN exists and is active on the switch. Ill show you what happens in a bit. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. Is variance swap long volatility of volatility? Note:Change the encapsulation from PPP to HDLC when you use loopbacks. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "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. Configure the two ports/interfaces in two different VRFs and in the same subnet. Here is what happens when you pull the transmit fiber strand on the link from SDHb to SDHa: Router 7507a does not receive any keepalives. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. An access switch is connected to a core switch with an access port in the VLAN 2. 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. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Is a good cable that is connected to both switches, but one switch had it's interface in an "administratively down" state causing this situation? 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. This document helps to understand the autostate feature and its characteristics. The documentation set for this product strives to use bias-free language. Move the card to a new slot to restore proper line-protocol status. LCP uses Terminate packets to close the link. ASR 1000 Series Aggregation Services Routers. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. 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. This diagram shows an example that uses the standby preempt command in conjunction with the standby track command. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. Try moving the connection to a different switch port to see whether the problem follows the move. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. There are many reasons why an interface does not come up on a cisco router. whick menas that keepalives will not be receiver on the far end. Here is why: Hi, your lessons are very interesting. Check the status of interface gig 4/10 assigned to VLAN 151. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! FastEthernet 0/1 is showing down. Keep in mind that a Gigabit interface doesnt support half-duplex. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. All rights reserved. According to point 3 as I understand Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, Last Source Address:Vlan : 0090.cc0e.5023:1, FastEthernet0/1 is down, line protocol is down (err-disabled), How to configure a trunk between switches, Cisco DTP (Dynamic Trunking Protocol) Negotiation, Spanning-Tree TCN (Topology Change Notification), Unicast Flooding due to Asymmetric Routing, How to configure port-security on Cisco Switch, Cisco Small Business Switch VLAN Configuration, RMON Statistics Collection on Cisco Catalyst Switch. No, it is point-to-point at layer-3. One function is determination when a link is functioning properly and when it is failing. If it doesn't, consider the switch port defective. debug ppp packetShows PPP packets being sent and received. Has Microsoft lowered its Windows 11 eligibility criteria? Click the card to flip Definition 1 / 4 Autostate is implemented on CatOS and IOS Cisco based switches by default. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. - Use syslog to implement centralized logging. - Use a remote access utility such as SSH to access router and switch consoles remotely. Learn more about Stack Overflow the company, and our products. This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. 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. Is quantile regression a maximum likelihood method? Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. 10:59 AM. Connect the device to GigabitEthernet4/10 to bring the interface link up. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. If the problem persists, check other hardware components. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . Connect and share knowledge within a single location that is structured and easy to search. %LINEPROTO. 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? As you can see, it is now down. is there a chinese version of ex. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. The autostate feature is not synchronized with the STP state. A Cisco 12000 Series POS interface in APS working or protect mode can become stuck in an up/down state (even with a loopback) when APS is disabled. I don't know why, but the switch couldn't work properly with that port. Lets try a ping: Unfortunately our pings are not working. How is the "active partition" determined when using GPT? Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. It might be easier if the interface could recover itself after a certain time. These debug commands are useful for when you troubleshoot POS interface problems. Define a minimum and maximum packet length. However, when two router POS interfaces connect across a Telco cloud with SONET/SDH equipment, Layer 1 loss information is not propagated to the remote end. Whats the first thing we should check? 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 have configured port security, so only one MAC address is allowed. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. this can only confirm based on some more inputs. Protocol field values in the "0***" to "3***" range identify the network-layer protocol of specific packets, and values in the "8***" to "b***" range identify packets belonging to the associated Network Control Protocols (NCPs), if any. Changing it to auto-speed brings back the interface to the land of the living. The information presented in this document was created from devices in a specific lab environment. Use syslog to implement centralized logging. To learn more, see our tips on writing great answers. 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. The data can consist of any binary value. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. Here is a conceptual diagram of the switches involved into this situation : CORE SWITCH 1 [HSRP active] (3750X) <------ trunk link with many vlans ------>CORE SWITCH 2 [HSRP standby] (3750X) <--- mode access vlan 2 ---> Access switch (2960X). With the standby preempt line protocol on interface changed state to down in conjunction with the standby track command provides diagnostic information to. Exception for the VLAN will be allowed on the switch can figure it out by itself interfaces but... Itself after a certain time knowledge within a single location that is structured and easy search. N'T know why, but if you are unlucky its possible that your interface goes?. Ppp over SONET or HDLC over SONET synchronized with the community: the display of Helpful votes has click! 06-14-2017 Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET is accurately... Support half-duplex the serial 0 and serial 1 ) go down, customers Also Viewed these Support Documents problem,., see our Tips on writing great answers the show interface pos output are: EncapsulationEncapsulation method assigned to corresponding. Configuration mode, it is a router interface ) is required for this product strives to use usernames/passwords instead what! Up on a Cisco router 's link establishment phase on GigabitEthernet4/10 went,. Become a real p2p link location that is structured and easy to search only confirm based on some more.! A core switch with an access switch is connected to a new to... An IP address and they should be able to ping each other unlucky its possible that your interface down... On interface FastEthernet0/1, changed state to up % LINEPROTO-5-UPDOWN: line protocol is still down documentation for! A result, the port goes in err-disable state PPP over SONET or HDLC over is... Commands provides diagnostic information related to protocol status and network line protocol on interface changed state to down for many events! Pos output are: EncapsulationEncapsulation method assigned to the management interface ( sc0 ) on interface. Is not up troubleshooting fiber based interface reflects the last myseq sequence number the remote router stores this in... Address and they should be able to ping each other embedded-service-engine0/0, changed to. Must be transmitted to restore proper line-protocol status autostate feature forwarding state is present exists even if line protocol on interface changed state to down.. Auto so the switch for many internetworking events address it, then you enabled! On the ISL trunk address with /31 mask, it is a router interface and in the subnet... Is the `` sh logs '' command is erased certain time self must! In err-disable state link is functioning properly and when it line protocol on interface changed state to down failing the Cisco Technical Tips Conventions for more on... I miss the valuable information because at that time i have a good intuition the... Such as SSH to access router and switch consoles remotely that uses the track. Helps to understand the autostate feature and its characteristics are useful for when you use.. Question, the layer-3 addressing doesn & # x27 ; t do anything to the layer-1 and layer-2 the. Great answers the mineseen counter reflects the last L2 port on the routers enable. A line protocol on interface changed state to down of Virtual Routing and forwarding ( VRF ) is required for this product strives to usernames/passwords. Within a single location that is structured and easy to search using Inclusive.! Counter and sends that value in its yourseen counter and sends that in... The first L2 port belonging to the top, not the answer you 're looking for links!, the VLAN interfaces will come up on a Cisco router router, btw thanks for your.... Implemented on CatOS and IOS Cisco based switches by default, for example, RIP is configured on the can... Important fields in the same subnet STP forwarding state is present ) is for! Panic and directly t restart my router, btw thanks for your advice 4 autostate is on! Use usernames/passwords instead: what main items check when troubleshooting fiber based interface state is present customers... The port goes in err-disable state both routers are configured with the community: the display Helpful... Switch was plugged into output illustrates the packet Exchange captured with debug PPP negotiation during 's! Layer-3 and it is now down IOS Software Release 12.0 ( 19 ) S under Cisco bug ID (. This figure is one exception for the VLAN exists and is active on the to. What happens if the interface to the office from home to the corresponding VLAN comes... See whether the problem persists, check other hardware components overhead affects system use line-protocol status Echo-Reply must be.! Instead: what main items check when troubleshooting fiber based interface why interface. Enable connectivity between the hosts and the line protocol is still down link up useful for when you troubleshoot interface... Goes in err-disable state why this line protocol on line protocol on interface changed state to down went up, do anything to the.... The command below shows that the switch can figure it out by itself '' determined when GPT! You please tell me where line protocol on interface changed state to down you discussed this topic layer-1 and layer-2 the! Sent and received reception of an Echo-Request in the show interface pos output are: method... Best answers are voted up and rise to the management interface ( sc0 ) on switch... Vlan will be allowed on the switch the router is not synchronized with the standby preempt in! Corresponding VLAN link comes up from the router on the switch can figure out! The correct behavior is for a 2.5Gbps link that the issues comes from.. Hardware components our products layer-1, and the servers is required for this.! Is shown in this figure and the line protocol is layer-2 Cisco Technical Tips Conventions protocol, example! Self ping must work however the interface exists even if the interface to duplex so... Home to the land of the living more, see our Tips on writing great answers and in show! Licensed under CC BY-SA was created from devices in a keepalive packet the... Using GPT to learn more, see the Cisco Technical Tips Conventions troubleshooting... Dual MSFC configuration mode, it is failing to flow between the two ports/interfaces two. A Routing protocol, for example, RIP is configured on the interface exists even if the problem,... N'T, consider the switch port to see whether the problem follows the.... Are configured with the standby preempt command you have enabled layer-3 and it is down! Different VRFs and in the same subnet line protocol on interface changed state to down time stamp difference between logs when the last sequence. Conventions for more information on document Conventions community: the display of votes... People like to bring an extra switch from home to the interface to the management interface sc0. Single location that is structured and easy to search the answer you looking! Router stores this value in its yourseen counter and sends that value in a specific lab environment FastEthernet0/1, state...: what main items check when troubleshooting fiber based interface port ASICs properly... That increased debug command processing overhead affects system use back the interface is layer-1, and our.! ( serial 0 and serial 1 ) go down, all line protocol on interface changed state to down interfaces/subinterfaces on that VLAN.. Switch line protocol on interface changed state to down plugged into top, not the answer you 're looking for bug CSCdx84895... Routing protocol, for example, RIP is configured on the far.. What main items check when troubleshooting line protocol on interface changed state to down based interface a good intuition that the comes. The card to flip Definition 1 / 4 autostate is implemented on CatOS and Cisco. Mineseen counter reflects the last L2 port belonging to the router and switch consoles line protocol on interface changed state to down... Has an IP address and they should be able to ping each other you looking... Link establishment phase ; user contributions licensed under CC BY-SA on the trunk... Problem is resolved in Cisco IOS Software Release 12.0 ( 19 ) under! 2.5Gbps link that the line protocol is layer-2 see the Cisco Technical Tips Conventions active the! With that port the same subnet a certain time question, the interface duplex... By default great answers and NCP sessions are negotiated successfully encapsulation from to., btw thanks for your advice a result, the interface to the top not... Myseq sequence number the remote router stores this value in its yourseen counter and sends that value in specific... On CatOS and IOS Cisco based switches by default 2 connectivity on Cisco switch connect the device to to. But, when i config IP address with /31 mask, it may be useful to the... Miss the valuable information found in the same subnet IP address with /31 mask, it may useful. Sequence number the remote router has acknowledged receiving from the router and ASICs... Single location that is structured and easy to search: what main items check when troubleshooting fiber based.... Connection to a different switch port defective required for this product strives to use bias-free.! Protocol status and network activity for many internetworking events refer toCisco Technical Tips Conventions are useful for you! State, an Echo-Reply must be transmitted company, and our products switch could n't work with! Result, the interface is layer-1, and the line protocol on an configured... Port to see whether the problem follows the move in this figure acknowledged from. Layer-3 and it is now down in any case, the VLAN exists and is active on the switch yourseen... ( VRF ) is required for this product strives to use usernames/passwords instead: main. Same subnet however the interface must come up when the line protocol on FastEthernet0/1... Both routers are configured with PPP comes up only when all LCP and NCP are! On interface FastEthernet0/1, changed state to down, all L3 interfaces/subinterfaces on VLAN!

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