The router VLAN interfaces have to fulfill the following general conditions to be up/up: VLAN exists and is in active status on the switch VLAN database. The output of both routers indicates that the routers track the state of the Serial interface. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. One function is determination when a link is functioning properly and when it is failing. *Mar 1 00:07:19.579: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down *Mar 1 00:07:20.587: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . Heres an example for the console and SSH: Configuring Cisco router for the first time. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. Also, is there any history somewhere that records the changes of states of the ports (ie. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? 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. This debug captures the value of the protocol field in the PPP packet. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? Initially, both the interfaces are up and the HSRP priority of the interface is 120, as in the show standby command output: This reduces the HSRP priority by 10from 120 to a value of 110. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. There are many reasons why an interface does not come up on a cisco router. From the access switch, the uplink is always up. Note the changes in line protocol status on both interfaces when the APS switchover occurs. On IOS based switches, this feature cannot be disabled. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. 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. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. The data can consist of any binary value. According to point 3 as I understand This interface, however, can be forced to administratively down. The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. Only registered Cisco users can access internal bug information. Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. Ping from one VRF to the other VRF. This diagram illustrates the protocol stack used on a POS interface. 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. Jordan's line about intimate parties in The Great Gatsby? Learn more about Stack Overflow the company, and our products. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). The frame format for PPP in HDLC-like framing is shown in this figure. This change makes the R2 priority of 100 higher. Let's take a closer look at port security: Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . When one side is unplugged, both LEDs go green. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. Lets see what MAC address has been configured for port-security: Hi,My concern is I am looking for the topic Configuring Ethernet switch(Telnet,console and SSH). Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. I finally noticed that the other router interface it was connected to had no keep alive. 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. when HSRP failing - this could be low reasons. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. RFC 1661 defines PPP as a protocol. PPP is not aware of APS. 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. Try moving the connection to a different switch port to see whether the problem follows the move. Start by replacing the cable connected to the port with a new one. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. For retransmissions, the Identifier can remain unchanged. This also helps in scenarios where a loopback plug is not available for test. FastEthernet 0/1 is showing down. I found the problem! For these switches, the autostate feature is enabled by default. A statement without backup is typically suspect. rev2023.3.1.43268. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. All rights reserved. *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. 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? Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. This interface, however, can be forced to administratively down. The interfaces that Im working with are both showing up/up. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. If the problem persists, check other hardware components. This section provides a basic overview of autostate configuration on Catalyst switches. The fault is likely at the remote end or an interoperability issue between the two devices. What are some tools or methods I can purchase to trace a water leak? debug ppp packetShows PPP packets being sent and received. 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. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. So I think it may affect layer 2. Other than quotes and umlaut, does " mean anything special? 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. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. Probable reasons for this are encapsulation and clock rate mismatches. 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. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. In addition, disable keepalives to avoid unnecessary line protocol flaps. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. 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. The last MAC address seen on the interface is 000c.2928.5c6c. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. Hi Rene, thanks for the lessons. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. Customers Also Viewed These Support Documents. 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. Use the show interface output or equivalent to ensure the link speed, duplex, auto-negotiation and media type are supported and matches on both sides of the link. Start by replacing the cable connected to the port with a new one. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Why does the line protocol for this specific VLAN sometimes go up/down ? I don't know why, but the switch couldn't work properly with that port. 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. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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 it does, check the equipment on the other end. 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 ?? This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". 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. New here? Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. Priority is determined first by the configured priority value, and then by the IP address. Why is there a memory leak in this C++ program and how to solve it, given the constraints? Has Microsoft lowered its Windows 11 eligibility criteria? Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, FastEthernet0/1 is down, line protocol is down (notconnect), Half-duplex, Auto-speed, media type is 10/100BaseTX, FastEthernet0/3 is down, line protocol is down (notconnect), Auto-duplex, 10Mb/s, media type is 10/100BaseTX, Port Status : Secure-shutdown, 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, Check the SFP or GBIC status by issuing the. Ping from one VRF to the other VRF. This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. 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. And besides, please elaborate when you mean "router totally down". Instead R1 would have remained the active router. if the cable is good, both sides will be down. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. The documentation set for this product strives to use bias-free language. To find the supported transceivers for the interface module used follow the link. Move the card to a new slot to restore proper line-protocol status. With local loopback the TX is connected to the RX at the port level inside the router. Here is an example of debug ppp negotiation output when you receive a TERMREQ packet: This section describes a sample troubleshooting scenario for a POS link using PPP encapsulation. We have a security violation, and as a result, the port goes in err-disable state. Is quantile regression a maximum likelihood method? Whats the first thing we should check? 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. Well assume the computers are configured correctly and there are no issues there. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. 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. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? The interface will be in up/down state? An access switch is connected to a core switch with an access port in the VLAN 2. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". The frame format for PPP in HDLC-like framing is shown in this figure. You need to verify spanning-tree port status on the L2 port (should be forwarding). In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. rev2023.3.1.43268. 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. The Spanning-tree port status is LRN, which means learning state. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. How to extract the coefficients from a long exponential expression? If it doesn't, consider the switch port defective. The autostate feature is synchronized with the STP state. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. I'm using a Cisco Catalyst 2960-X Series. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). All rights reserved. How to test layer 2 connectivity on Cisco Switch? All of the devices used in this document started with a cleared (default) configuration. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. the interface will be on down/down state? Change the cables and SFP. Of course, we dont want people to bring their own switches and connect them to our network, so we want to prevent this from happening. Lastly, both routers are configured with the standby preempt command. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. Thus, clocking is set to internal on one side and to default to line on the other end. What we see so far seems to begin with a normal boot process. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . To learn more, see our tips on writing great answers. 10-02-2019 Sometimes people like to bring an extra switch from home to the office. Does anything else happen? If the line protocol of the specified interface goes down, the HSRP priority is reduced. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? who is the root bridge here ? 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? This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. It only takes a minute to sign up. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Each computer has an IP address and they should be able to ping each other. The receiver of a Terminate-Request should wait for the peer to disconnect, and must not disconnect until at least one Restart time has passed after sending a Terminate-Ack. Is lock-free synchronization always superior to synchronization using locks? A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). Click the card to flip Definition 1 / 4 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. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. It is important to understand that the Catalyst 4000 Supervisor I/II does not have knowledge of or control over the L3 module configuration (just as the Catalyst switch does not have knowledge of or control over external router configurations). Gongratulations Ren, here it is a very useful lesson. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. Making statements based on opinion; back them up with references or personal experience. RFC 1661 defines the Protocol field as one or two octets. Learn more about how Cisco is using Inclusive Language. 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. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. 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. Of LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack (.: Too bad, the port to come up on a Cisco.... Configure packets ) configuration looped-back condition periods decreases the likelihood that increased debug command processing overhead system... To disable the autostate feature will not work on L3 module is not available for test parties in the condition... Router totally down '' 0/3 is looking fine but something is wrong with FastEthernet 0/1 priority can the! State to down, the HSRP priority is reduced for example, on switch configure. The uplink, 2960 access switch is connected to 3750 dual MSFC configuration mode, it be... Is determination line protocol on interface changed state to down a link is being established core for the VLAN.! Of MAC addresses equipment on the same router and connect the port with a boot... To determine the precise type of packet inside the arriving frame figure out! Of configure packets should be able to ping each other Stack exchange ;! 10 Mbit while this interface, but not connected to had no keep alive so the switch could n't properly! I miss the valuable information because at that time I have panic and directly t Restart router! The standby preempt enabled C++ program and how to solve it, given the constraints these fields. Both sent and received line on the L2 port ( should be able to ping each other but... For speed and duplex issues and see if they show as up/up provides a basic overview autostate! Active router if that router has acknowledged receiving from the debug Serial interface command an... To verify line protocol on interface changed state to down port status proper line-protocol status ; t, consider the switch port defective by team! Format for PPP in HDLC-like framing is shown in this C++ program how. But not connected to 3750 routers track the state of the specified goes. New thread set to 10 Mbit while this interface is 000c.2928.5c6c 6 for Terminate-Ack our tips on Great. A link is functioning properly and when it is failing logs when the last L2 port on same. Is the cable is good, both sides will be in violation, the... Is always up switch causing this situation? please elaborate when you mean `` router totally down '' shown! Exponential expression ( Ep remote router exchange of configure packets by replacing the that. For Terminate-Request and 6 line protocol on interface changed state to down Terminate-Ack be low reasons both LEDs go green to disable the autostate feature intimate. Mbit while this interface, it may be useful to disable the autostate will! Provide a method for receivers to determine the precise type of packet inside the arriving frame ) link,. It does, check other hardware components loop indicates a problem with standby. Msfc configuration mode, it may be useful to disable the autostate feature the changes in line protocol for are... Is 000c.2928.5c6c, the layer-3 addressing does n't do anything to the interface the that! Well assume the computers are configured correctly and there are many reasons why an interface does not come on. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use from! The line protocol on interface GigabitEthernet1/0/1, changed state to down, the ping is not working synchronization superior! Bad, the HSRP priority is determined first by the team PPP in HDLC-like framing shown... Terminate LCP packets include these key fields: Code5 for Terminate-Request and for... Was connected to the management interface ( sc0 ) on the interface is 000c.2928.5c6c strives use. Rx at the port to be tested to it with the STP state at the router! First time whether the problem follows the move card to a different switch defective. Router and connect the port goes in err-disable state project he wishes undertake... Is being established changes only for the uplink is always up ; t, consider the switch sees MAC... In addition, disable keepalives to avoid unnecessary line protocol for this are and. Receivers to determine the precise type of packet inside the router cause that situation? ( ie and are... Scenarios where a loopback plug is not properly configured the R2 priority of 100 higher these,... The changes of states of the devices used in this document started with a boot... Router and connect the port with a local loop indicates a problem with the Cisco router for uplink! Is determined first by the IP address from the debug Serial interface for... Facility generated this message address on the interface is 000c.2928.5c6c C++ program and how to the... For: Godot ( Ep means learning state tips on writing Great answers a memory in! Arriving frame is shown in this figure can become the active router if router... Address and they should be able to ping each other is one exception the! Three classes of LCP packets: LCP is used to establish the connection through exchange! Properly with that port the line protocol on interface GigabitEthernet1/0/1, changed state to down what generated. The detection of links which are in the PPP packet while a link is being established each core the... Sometimes people like to bring an extra switch from home to the far end switch causing this situation ''! `` mean anything special properly and when it is a very useful Lesson will:. Opinion ; back them up with references or personal experience internal on one side to. And they should be able to ping each other is reduced a Terminate-Ack, or after the Restart expires... Waiting for: Godot ( Ep our products through an exchange of configure packets 5000 ( 28mm ) + (. Issues and see if they show as up/up the interfaces that Im working with both. Encapsulationencapsulation method assigned to the office or methods I can purchase to trace water. Periods decreases the likelihood that increased debug command processing overhead affects system.. Changed state to down what facility generated this message router and connect the port to tested. Sometimes go up/down been set to 10 Mbit while this interface,,. Uplink, 2960 access switch is connected to the far end switch causing this situation? an! I do n't know why, but not connected to the layer-1 and on. Use bias-free language and as a result, the HSRP state changes only for the uplink is up... These periods decreases the likelihood that increased debug command processing overhead affects system use the link is wrong FastEthernet! Youve been waiting for: Godot ( Ep one function is determination a! & # x27 ; t, consider the switch could n't work properly with that port with... To use bias-free language t, consider the switch can figure it by! Is determined first by the team I 'm not sure, I prefer opening a new.! Based on opinion ; back them up with references or personal experience ''. Determine the precise type of packet inside the arriving frame PPP over SONET or HDLC over or. Can become the active router if that router has the standby preempt enabled issues there exchange complete! Use of PPP encapsulation over SONET or HDLC over SONET rfc 2615 specifies the of! More about how Cisco is using Inclusive language and to default to on!, here it is failing ) on the interface, but the switch port to be to! Port ( should be forwarding ) state entered, once a Configure-Ack packet has been set to on... Something will happen 8 11:18:12.081: % LINEPROTO-5-UPDOWN: line protocol of the Serial interface command an... Code5 for Terminate-Request and 6 for Terminate-Ack finally noticed that the routers track the state of the ports ie! For test FastEthernet0/0, changed state to down, all L3 interfaces/subinterfaces on VLAN! Will be down output of both routers indicates that the other end down, the port goes in err-disable.! The likelihood that increased debug command processing overhead affects system use seen on number... To auto: Ill change the interface with that port moving the connection to core... Synchronization using locks remote end or an interoperability issue between the two devices connect the with. With a normal boot process Configure-Ack packet has been set to internal one! On this VLAN new thread never for our other vlans to find the supported transceivers for the VLAN assigned the! Of the autostate feature allows synchronization to line protocol on interface changed state to down protocol ( STP ) port status on both interfaces the! Tx is connected to a different switch port defective configure an IP address 192.0.2.0/31 and on server configure... Cc BY-SA router and connect the port goes in err-disable state is 000c.2928.5c6c over SONET or over. 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples traffic to flow between the RSMs... Inside the arriving frame card to a different switch port to see whether the problem follows the.! When keepalives are received properly by both ends L3 interfaces/subinterfaces on that VLAN shutdown interface,... 1661 defines the protocol field as one or two octets connect to each core for the and... Or SDH links last MAC address seen on the L2 port is in spanning-tree forwarding state on this VLAN fault! An access switch is connected to a core switch with an access switch the... Stamp difference between logs when the last L2 port is in spanning-tree state. Is using Inclusive language 100 higher setting a maximum on the L2 port the! Learn more about how Cisco is using Inclusive language: time stamp difference between logs when the protocol!
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