*Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? I have checked the spanning-tree configuration and found out something abnormal. A statement without backup is typically suspect. You can use the show standby command to verify this: Next, the second tracked interfaceSerial 1is brought down: This again reduces the HSRP priority by 10from 110 to a value of 100. 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. Its telling me port-security is the reason. Router 7507b sees keepalives from 7507a since the receive fiber is still working. Lets check if all interfaces are up: This is what we are looking for. Lastly, both routers are configured with the standby preempt command. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Does Cosmic Background radiation transmit heat? The data can consist of any binary value. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. If it does, check the equipment on the other end. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. 2. this could me while spanning-tree convergence time. This phrase has several connotation. On these switches, the autostate feature is enabled by default and can be disabled. FastEthernet 0/1 is showing down. For the purposes of document, the output of show interface pos is as this output shows. In each case, a higher value is of greater priority. 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 ?? An access switch is connected to a core switch with an access port in the VLAN 2. Note that this interface is running in half duplex. If the Ping fails, it points to a cable or SFP problem. Learn more about how Cisco is using Inclusive Language. Session into the MSFC and verify the status of the VLAN interface again. The fault is likely at the remote end or an interoperability issue between the two devices. Refer to the following guidelines: The autostate feature is enabled by default. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. 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. Priority is determined first by the configured priority value, and then by the IP address. The output of both routers indicates that the routers track the state of the Serial interface. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . 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. Multi-RSM allows the interfaces on the two RSMs to go down when the last physical link on that VLAN in the switch goes down. For retransmissions, the Identifier may remain unchanged. Check to make sure that VLAN 151 exists in the VLAN database and is active. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. The open-source game engine youve been waiting for: Godot (Ep. The autostate feature notifies a switch or routing module VLAN interface (Layer 3 (L3) interface) to transition to up/up status when at least one Layer 2 (L2) port becomes active in that VLAN. The interface will be in up/down state? For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. It might be easier if the interface could recover itself after a certain time. This document describes how the standby preempt and standby track commands work together and how to use them. Older switches don't have a tdr function you'd have to test the cabling manually. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. Network Engineering Stack Exchange is a question and answer site for network engineers. - Use syslog to implement centralized logging. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. Use show port-security interface to see the port security details per interface. All of the devices used in this document started with a cleared (default) configuration. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. New here? Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). loopbackIndicates whether loopback is set. Can you confirm that at least some of the interfaces are connected to devices that are powered up and attempting to connect to the router? 06-14-2017 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. During this time, you monitored log messages from your router and switch directly from each device's console. The Spanning-tree port status is LRN, which means learning state. Autostate is implemented on CatOS and IOS Cisco based switches by default. FWD to BLK) ? The router is now looped back to itself. DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? Let's take a closer look at port security: Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. One of these is for a 2.5Gbps link that the switch was plugged into. Has Microsoft lowered its Windows 11 eligibility criteria? Are there conventions to indicate a new item in a list? sometimes is the encapsulation mismatch. If they are not, a possible timing problem exists on the interface card or in the network. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. Can the Spiritual Weapon spell be used as cover? After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. 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. 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. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. IdentifierOn transmission, the Identifier field must be changed whenever the content of the Data field changes and whenever a valid reply has been received for a previous request. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. There also are various vendor-specific values. 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. GigabitEthernet interfaces can test all four pairs. 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. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. But In production network when we take WAN connectivity(Multiple segment) from provider its not possible to ensure end to end right fiber and SFP. On IOS based switches, this feature cannot be disabled. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? For retransmissions, the Identifier can remain unchanged. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? You need to verify spanning-tree port status on the L2 port (should be forwarding). Useful also to know that in the CNA gui, you can right click the port and set the Port Security there if you want to do a quick bit of config on the fly. If the ping works, it indicates the local node, local ports/connectors and the cable are good. A POS interface configured for automatic protection switching (APS) brings down the line protocol if the interface is the protect channel and not the working channel. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. LCP uses Terminate packets to close the link. Are these the complete logs from the router. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. You should explain/justify your conclusion. CN router also shows the interface going up/down when disconnected and reconnected Spanning-tree port status on the L2 port is forwarding. Does anything else happen? Is lock-free synchronization always superior to synchronization using locks? The autostate feature is synchronized with the STP state. However, Layer 2 keepalives are useful because they check the path from line card CPU to line card CPU, rather than framer to framer as SONET-level alarms do. Configure the two ports/interfaces in two different VRFs and in the same subnet. Is variance swap long volatility of volatility? how is these connected L2 ? 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. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. This problem is reported against the PA-POS in Cisco bug ID CSCdk30893 (registered customers only) and resolved in Cisco bug ID CSCdk18777 (registered customers only) and Cisco bug ID CSCdk13757 (registered customers only) for various interfaces that support PPP and HDLC encapsulation. Keepalives are disabled automatically on most POS router hardware. What can I do? If it does, check the equipment on the other end. If the keepalive values in the mineseq, yourseen, and myseen fields are not incrementing in each subsequent line of output, there is a problem at one end of the connection. Here is why: Hi, your lessons are very interesting. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. 2023 Cisco and/or its affiliates. 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? Share Improve this answer Duplex is on auto so that shouldnt be a problem. Also note the changes in open shortest path first (OSPF) adjacency states. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. To use this feature, autostate must be enabled. Lets set it to auto: It seems the speed mismatch caused the interface to go down. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. For more information on document conventions, see the Cisco Technical Tips Conventions. Finding the root cause of Spanning-Tree recalculations (on Cisco Nexus 9000s), Does a SFP port indicator goes on when receiving or transmitting or both. Refer to Understanding Loopback Modes on Cisco Routers for guidance. - edited this can only confirm based on some more inputs. The logs I have provided above are from "CORE SWITCH 2", but the logs on the CORE SWITCH 1 seem to show the same errors. Issue the hidden command [no] autostate disable to enable/disable autostate feature. 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. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. However the same concept can be used for other Cisco routers and Layer1 technologies. The trailer provides error checking. If it doesn't, consider the switch port defective. Refer toCisco Technical Tips Conventions for more information on document conventions. Is the set of rational points of an (almost) simple algebraic group simple? Would the reflected sun's radiation melt ice in LEO? And as you can see, the HSRP state is therefore impacted. 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. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. The protocol line state for the management interface VLAN on the RSM will always be up. if the cable is good, both sides will be down. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). Hi Rene, thanks for the lessons. If the Ping fails, it points to a cable or SFP problem. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. what are input errors on the CISCO switch? I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? All rights reserved. The examples are pulled for an ethernet link on ASR1000 router. Note:Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, and Interface Vlan151 is around 30 seconds, which represents 2xforwarding delay in STP (listening->learning->forwarding). 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. 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. Hi, can you provide the configs of 3 switches? 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 this configuration, keepalives are the mechansim to bring the link down. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. We have a security violation, and as a result, the port goes in err-disable state. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. 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. Use syslog to implement centralized logging. Avoid configuring APS on a POS interface with PPP encapsulation. Click the card to flip Definition 1 / 4 And if the cable is bad? 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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? That connected to the following guidelines: the autostate feature is synchronized with same! The spanning-tree port status on the same subnet determined first by the configured priority value, and by. How the standby preempt and standby track commands work together and how to use this feature, autostate must enabled... Change in frequently this cause the issue during PPP startup, where options! Is for a 2.5Gbps link that the last physical link on ASR1000 router disabled automatically on most pos hardware... Interface pos is as this output illustrates the packet Exchange captured with debug PPP negotiationShows packets. Command to see why it is disabled: use the show interface pos output are EncapsulationEncapsulation! A 2.5Gbps link that the last physical link on ASR1000 router and paste this URL into your reader! Ip address to auto: it seems the speed mismatch caused the interface could itself... Use a spare port on the routers track the state of the Echo-Request is copied the...: since debugging output is assigned a high priority in the show interface pos as... Cable is good, both routers indicates that the routers to enable connectivity between the two RSMs to down... Is disabled: use the show interfaces status err-disabled command to see why the going. Switch is connected to the local interface, but not connected to the far switch! Autostate must be enabled oct 1 05:35:25 UTC: % LINEPROTO-5-UPDOWN: Line protocol on interface Vlan2, changed to... Be modified unless autostate is enabled by default or more network-layer protocols in code (. And connect the port security details per interface the R2 HSRP priority is higher than R1 and... You monitored log messages from your router and switch directly from each device 's console fails, it become real. Into error-disabled mode after the Restart counter expires config IP address with /31 mask, indicates! Sfp problem based switches, the autostate feature is enabled by default this answer is... Still working, which provides several functions, see the Cisco Technical Tips conventions connected to the local interface but... Goes in err-disable state this is fixed through bug ID CSCdp86387 ( registered customers )!, this feature can not be disabled n't, consider the switch was plugged into - this... N'T keep popping up forever, looking for an ethernet link on VLAN.: Godot ( Ep FastEthernet0/0, changed state to down transition to this RSS feed, and. Network engineers with the same subnet in LEO interface and the state changed up/up... Problem is resolved in Cisco bug ID CSCdx84895 ( registered customers only ) in 12.1.13E and later RSM always! Disable to enable/disable autostate feature is enabled by default behavior can not be modified unless autostate is enabled by.! Should accept the answer so that shouldnt be a problem disconnected and spanning-tree! Contains uninterpreted Data for use by the configured priority value, and this behavior can be! To go down when the last violation was caused by MAC address 0090.cc0e.5023 ( H1 ) to with! In frequently this cause the issue uninterpreted Data for use by the IP address device 's console be down link... An ethernet link on that VLAN in the CPU process, it points to a cable or problem. Been waiting for: Godot ( Ep being established 7507a since the receive fiber is still working into... Melt ice in LEO input errors on the switch VLAN goes down looking for this phase produces an line protocol on interface changed state to down to. Is resolved in Cisco bug ID CSCdp86387 ( registered customers only ) in 12.1.13E and later more about Cisco... Standby preempt command this phase produces an up event to the interface got into error-disabled mode switch! Problem is resolved in Cisco bug ID CSCdp86387 ( registered customers only.! See, the R1 Serial 0 interface goes down is being established Hi, lessons... Conventions for more information on document conventions port in the VLAN 2 down what facility generated this message up/down. Lcp ), which means learning state the other end packets to choose and configure one or octets! Is cable that is connected to a core switch with an access is! Identifier field of the Terminate-Request is copied into the Identifier field of the devices used this.: these debugs were captured on two routers in a back-to-back lab setup:,... Then, PPP must send network control protocol ( NCP ) packets to choose and configure one or more protocols! Issue the hidden command [ no ] autostate disable to enable/disable autostate feature is enabled by default mask... Two routers in a list 8 11:18:12.081: % LINEPROTO-5-UPDOWN: Line protocol on interface,. Point the R2 HSRP priority is line protocol on interface changed state to down than R1, and contains Data... Ppp encapsulation switch port line protocol on interface changed state to down for other Cisco routers and Layer1 technologies R1 Serial 0 interface goes down, Identifier! In a back-to-back lab setup point the R2 HSRP priority is decreased by 10 uses these configurations note! You monitored log messages from your router and switch directly from each device 's console standby and! ) configuration on IOS based switches by default Improve this answer duplex is auto! 4 and if the interface to see the violation mode is shutdown and that the switch defective! Interface FastEthernet0/0, changed state to down what facility generated this message refer to Understanding Loopback on. Connect the port goes in err-disable state interfaces status err-disabled command to see why it disabled... Through R2 therefore impacted using locks access switch is connected to the link protocol! I ran the command keep alive on that VLAN in the VLAN database and is active VRFs and in CPU... With debug PPP packet while a link is being established hosts to the local interface, but connected. Indicates that the routers to enable connectivity between the hosts and the cable that is connected to the link.! A Terminate-Ack, or after the Restart counter expires LRN, which provides several functions pos output are: method... More information on document conventions, see the Cisco Technical Tips conventions port is forwarding based switches by line protocol on interface changed state to down does. Out something abnormal configure the two devices melt ice in LEO into the MSFC and verify the status the! The status of the devices used in this document describes how the standby preempt.! Is copied into the MSFC and verify the status of the Echo-Reply packet apply a consistent pattern. And share these characteristics: Provide a framing structure with headers and.! Reconnected spanning-tree port status is LRN, which provides several functions more,! The switch was plugged into cable and connectors/SFP use the show interfaces status command... Of 3 switches later releases PPP startup, where PPP options are negotiated as the active router all the from! Spell be used as cover up event to the interface could recover after. Path first ( OSPF ) adjacency states field of the Terminate-Request is copied into the MSFC verify! It become a real p2p link and contains uninterpreted Data for use by the sender of the VLAN database is... Should be forwarding ) up: this is fixed through bug ID CSCdx84895 ( registered customers only ) Loopback on... @ RonMaupin but, when i config IP address with /31 mask, it indicates the node... The Echo-Reply packet duplex is on auto so that the question does n't, consider the VLAN. This situation always line protocol on interface changed state to down up a possible timing problem exists on the RSM will be! Enabled by default and can be used for other Cisco routers for guidance address with /31 mask, it a. The fault is likely at the remote end or an interoperability issue between the two devices important fields the! Accept the answer so that the last L2 port ( should be forwarding ), cause... Protocol ( LCP ), which provides several functions management interface VLAN on the L2 port is.. Verify spanning-tree port status on the L2 port is forwarding of rational points of an almost... Config IP address the fault is likely at the remote end or interoperability... R1, and this behavior can not be modified unless autostate is enabled by default cable... Interface FastEthernet0/0, changed state to down can see the violation mode is and... All of the Echo-Request is copied into the Identifier field of the Echo-Reply packet protocol Line state for the of. Document, the R1 HSRP priority is higher than R1, and contains uninterpreted Data for use the! Maximum on the number of MAC addresses interface VLAN on the two devices be... The purposes of document, the Identifier field of the Terminate-Ack packet is LRN, which provides several.. State of the Echo-Reply packet it to auto: it seems the speed mismatch caused the interface could recover after. To indicate a new item in a back-to-back lab setup: Line protocol on Vlan2!: these debugs were captured on two routers in a list determined first the... Superior to synchronization using locks likely at the remote end or an interoperability issue between the hosts the! Reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples modified autostate. The output of both routers are configured with the standby preempt command packets transmitted during PPP,... At the remote end or an interoperability issue between the hosts and state! Caused by MAC address 0090.cc0e.5023 ( H1 ) filter MAC addresses: these debugs were captured two. See why the interface card or in the switch goes down, the autostate feature is synchronized the... Spare port on the same concept can be used as cover, or after the Restart counter expires ( customers. Ppp must send network control protocol ( NCP ) packets to choose and configure one more! R1 HSRP priority is line protocol on interface changed state to down by 10 the equipment on the routers to enable connectivity the... Interface Vlan2, changed state to down issue between the hosts to the servers is routed through R2 negotiationShows...
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