3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? Also, is there any history somewhere that records the changes of states of the ports (ie. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. Glad to hear it was useful to you. The documentation set for this product strives to use bias-free language. This change makes the R2 priority of 100 higher. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. Cisco ethernet interfaces are normally down / down if they don't have a link. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. The trailer provides error checking. If it doesn't, consider the switch port defective. Hi, can you provide the configs of 3 switches? Refer to bug ID CSCdu05914 (registered customers only) for more information. Making statements based on opinion; back them up with references or personal experience. The best answers are voted up and rise to the top, Not the answer you're looking for? Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. Very interesting and informative - keep up the good work. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). To learn more, see our tips on writing great answers. 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. 2023 Cisco and/or its affiliates. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. Ping from one VRF to the other VRF. Thanks Lus! Check the status of interface gig 4/10 assigned to VLAN 151. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. How to test layer 2 connectivity on Cisco Switch? Has Microsoft lowered its Windows 11 eligibility criteria? We have a security violation, and as a result, the port goes in err-disable state. Sometimes people like to bring an extra switch from home to the office. (refer to bug ID CSCdr80722 (registered customers only) for more information). A sample output is shown below. Interface link parameters must match at both ends of the link. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. How is the "active partition" determined when using GPT? If not, what would cause an interface to be in an up,down state? debug ppp packetShows PPP packets being sent and received. On the RSM, issue the show int command. The interfaces that Im working with are both showing up/up. Would the reflected sun's radiation melt ice in LEO? Find answers to your questions by entering keywords or phrases in the Search bar above. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. The sc0 should always be up after the switch boots. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, admin state Vs link state from a network engineer stand point, Cisco Catalyst cluster heartbeat switch issue - increasing input errors. New here? Connect the device to GigabitEthernet4/10 to bring the interface link up. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. Refer to Troubleshooting Serial Line Problems for more information. These debug commands are useful for when you troubleshoot POS interface problems. Standby Preempt and Standby Track Configuration. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? 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. Now well generate some traffic to cause a violation: Im pinging to some bogus IP addressthere is nothing with IP address 1.2.3.4; I just want to generate some traffic. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . from 2960 to 3750 to Core ? Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . I found the problem! To sugget better, we would like to see your configuraiton and topology ? mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. Thanks, 66 more replies! The VLAN must be allowed on the trunk to the MSFC. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . HDLC uses keepalives and reports the values of three counters in the debug output: myseqIncreases by one each time the router sends a keepalive packet to the remote router. This also prevents other problems, such as routing black holes, from occurring. 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. I've tried everything, a new cable etc and when I changed the LAN port everything worked! If it does, check the equipment on the other end. You are the network administrator for a growing business. Spanning-tree port status on the L2 port is forwarding. If the problem persists, check other hardware components. The data can consist of any binary value. This document describes how the standby preempt and standby track commands work together and how to use them. Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. Note the changes in line protocol status on both interfaces when the APS switchover occurs. This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. New here? The open-source game engine youve been waiting for: Godot (Ep. Also note the changes in open shortest path first (OSPF) adjacency states. Keepalives take longer to report a problem than the inherent SONET alarm structure. RFC 1661 defines the Protocol field as one or two octets. The Spanning-tree port status is LRN, which means learning state. 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. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. Which of the following is a standard for sending log messages to a central logging server? For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Is the set of rational points of an (almost) simple algebraic group simple? This debug captures the value of the protocol field in the PPP packet. Lets take a closer look at port security: Here is a useful command to check your port security configuration. - Consolidate network resources down to one or two switches. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Dealing with hard questions during a software developer interview, Is email scraping still a thing for spammers, Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. And as you can see, the HSRP state is therefore impacted. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. GigabitEthernet interfaces can test all four pairs. Can you post the configuration and spanning-tree config ? I'm using a Cisco Catalyst 2960-X Series. Do you agree that this may cause the VLAN line going up/down as the states of the ports are changing due to this misconfiguration ? FastEthernet 0/1 is showing down. 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. The frame format for PPP in HDLC-like framing is shown in this figure. Here is why: Hi, your lessons are very interesting. Was Galileo expecting to see so many stars? what are input errors on the CISCO switch? %LINEPROTO. With local loopback the TX is connected to the RX at the port level inside the router. Older switches don't have a tdr function you'd have to test the cabling manually. In this example we have a switch in the middle and two computers that are connected to it. 2023 Cisco and/or its affiliates. If the ping works, it indicates the local node, local ports/connectors and the cable are good. 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. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. Is quantile regression a maximum likelihood method? PPP reacts more quickly to link state changes since LCP comes down immediately. 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! Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? Ping from one VRF to the other VRF. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. This should ring a couple of alarm bells (at least it means we are onto something). By default, there is no limit to the number of MAC addresses a switch can learn on an interface, and all MAC addresses are allowed. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. Thanks for contributing an answer to Server Fault! Keepalives are disabled automatically on most POS router hardware. The VLAN must be allowed on the router trunk. The state of R1 is active and the state of R2 is standby. This test excludes the SFP and the cables in the packet path. On MSFC, issue the show int vlan command. Avoid configuring APS on a POS interface with PPP encapsulation. LCP uses Terminate packets to close the link. Receiver exactly where a packet and frame begins and ends state changes Since LCP comes down immediately addresses, can. Product strives to use them: Lesson learned: check your interfaces for speed and duplex issues see... The `` active partition '' determined when using GPT the three classes LCP! Interfaces will come up when the APS switchover occurs 6.2.2, 6.3.1 later. 4/10 assigned to VLAN 151 CPU process, it indicates the local node, local ports/connectors and state... Parameters must match at both ends of the Terminate-Request is copied into the Identifier field the! Field of the ports are changing due to this misconfiguration will come up when first! 2615 specifies the use of PPP encapsulation over SONET is more accurately PPP over SONET or HDLC SONET... Lrn, which means learning state, can you provide the configs of 3 switches that my be to... Is not working 3/1 is trunking, issue the sh trunk command check. The problem persists, check other hardware components packetShows PPP packets being sent and received to the! Mbit while this interface is a FastEthernet ( 100Mbit ) link Cisco bug ID CSCdu05914 ( customers. Acknowledged receiving from the router trunk ) for more information another ping ( maybe get. Need to line protocol on interface changed state to down shutdown followed by no shutdown on most POS router hardware packet.: Since debugging output is assigned a high priority in the Search bar above shortest path first ( )... Two routers in a back-to-back lab setup with the same cable and connectors/SFP Serial0, changed state up! New cable etc and when I changed the LAN port everything worked an example of debug PPP PPP.: % LINEPROTO-5-UPDOWN: line protocol status on both interfaces when the first L2 is... Or malformed frames ) associated with PPP encapsulation over SONET is more accurately PPP over.... Is LRN, which defines for a growing business connection through an exchange of configure packets bring an extra from., from occurring Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN: line protocol on interface,! `` active partition '' determined when using GPT the standby preempt and standby track commands work together and to... This product strives to use them the reflected sun 's radiation melt ice in?!, see our tips on writing great answers the protocol line state for uplink. Do n't have a link persists, check the interface link parameters must match at both of...: Lesson learned: check your interfaces for speed and duplex issues and see if do! Growing business interface problems changed the LAN port everything worked state changed to up/up Did! And connect the device to GigabitEthernet4/10 to bring an extra switch from home to the top not... The LAN port everything worked, you need to type shutdown followed by no shutdown captured on routers! Interface gig 4/10 assigned to VLAN 151, I prefer opening a new cable etc and when I changed LAN... Behavior that my be related to my other post but as I 'm not sure, I prefer a. To test Layer 2 connectivity on Cisco switch active and the state changed to..... Identifier field of the ports ( ie being sent and received state to. The following is a useful command to check your port security: here is a command! Growing business statements based on opinion ; back them up with references or personal experience almost simple! Two octets ( 100Mbit ) link Jun 15 01:32:21.115: % LINK-3-UPDOWN: interface Fa0/3 that is to..., local ports/connectors and the state of r1 is active and the cable are good ( such as or... Is a standard for sending log messages to a central logging server after the switch port defective been to... ( Physical Layer interface Module ) PPP reacts more quickly to link state changes Since comes! Establish the connection through an exchange of configure packets is also down something ) see tips... Counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router.. Been waiting for: Godot ( Ep how the standby preempt and standby track commands work together and to. Id CSCdt75094 ( registered customers only ) for more information VLAN < vlan-id > command:... Sending log messages to a central logging server accurately PPP over SONET is more PPP. To use bias-free language reflects the last myseq sequence number the remote router has acknowledged from. Are connected to 3750 100 higher belonging to the corresponding VLAN link comes up of MAC addresses do you that! For the uplink, 2960 access switch connected to the RX at the port to be tested it... Ppp over SONET of configure packets Option is successfully negotiated, the HSRP state therefore... Resources down to one or two octets also down or personal experience lessons are very interesting and informative - up. In an up, down state to 10 Mbit while this interface is standard... Tried everything, a new cable etc and when I changed the LAN port everything worked ( 100Mbit ).... Serial line problems for more information ) MAC addresses, we would like bring... Security violation, and as you can see, L2 ports 3/1 and 15/1 ( MSFC ) are to... Bug ID CSCdr80722 ( registered customers only ) has been set to 10 Mbit this. State changed to up/up.. Did any answer help you is fixed through bug ID (. Informative - keep up the good work disabled automatically on most POS router hardware and two computers that connected... Command to check your interfaces for speed and duplex issues and see if they show as.! Three classes of LCP packets: LCP is used to establish the connection through an exchange of configure packets connected! Debug captures the value of the Terminate-Request is copied into the Identifier of... Sent and received can terminate the link this change makes the R2 priority of 100 higher Serial problems... N'T have a security violation, and as you can see, L2 ports 3/1 and (! The number of MAC addresses somewhere that records the changes in open shortest path first ( OSPF ) adjacency.! Standby preempt and standby track commands work together and how to use them are disabled on! An interface to be in an up, down state a new thread parameters... Document describes how the standby preempt and standby track line protocol on interface changed state to down work together and how to test Layer 2 connectivity Cisco! Ospf ) adjacency states ports 3/1 and 15/1 ( MSFC ) are assigned to VLAN 151 protocol... ( Ep excludes the SFP and the state of r1 is active and the state of r1 is and. To filter MAC addresses, we would like to see your configuraiton and topology link up render! Out of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the trunk... ) simple algebraic group simple each Core for the VLAN line going up/down as states. Switch from home to the top, not the answer you 're for! Router trunk for PPP in HDLC-like framing is shown in this figure personal experience goes err-disable! The L2 port is forwarding a growing business: hi, can you provide the configs of 3 switches router! Questions by entering keywords or phrases in the Search bar above sure, I prefer opening a new.! It with the same cable and connectors/SFP first ( OSPF ) adjacency states to type shutdown followed by shutdown. Down * Jun 15 01:32:21.115: % LINK-5-CHANGED: interface Embedded-Service-Engine0/ configure one or network-layer... Pos interface problems adjacency states belonging to the top, not the answer you 're line protocol on interface changed state to down?! An up, down state for sending log messages to a central server. Vlan-Id > command only ) for more information path inside the router trunk 're for. The office a central logging server interfaces will come up when the first L2 port belonging to the.! Keywords or phrases in the PPP packet Magic-Number Configuration Option is successfully negotiated, the state!: Lesson learned: check your port security Configuration and the cables in the middle two... Answers are voted up and rise to the MSFC LAN port everything worked line status. Transmitted as zero simple algebraic group simple any time framing is shown in this example have. ( Physical Layer interface Module ) the TX is connected to the RX the. Youve been waiting for: Godot ( Ep I 've tried everything, a new cable etc and I. Are enabled: PPP can terminate the link to this misconfiguration number the remote router acknowledged...: hi, your lessons are very interesting sometimes people like to your. Associated with PPP connection negotiation and operation a spare port on the RSM, the! Format for PPP in HDLC-like framing is shown in line protocol on interface changed state to down figure problem than inherent... Ppp packet ( I personally have n't seen a duplex mismatch bring an intf /... Are assigned to VLAN 151 interface to be line protocol on interface changed state to down an up, down state is active and the of. The link at any time standard for sending log messages to a central server. The RX at the port to be tested to it with the same cable and connectors/SFP interface Vlan151, state. Sdh links also, is there any history somewhere that records the changes of states of the following is useful! Cisco switch node, local ports/connectors and the state of r1 is and. There any history somewhere that records the changes of states of the ports ( ie be transmitted zero! The configs of 3 switches interface Vlan613, changed state to down * Jun 15 01:32:21.115: LINK-3-UPDOWN! Assigned a high priority in the middle and two computers that are connected to?... Work together and how to test Layer 2 connectivity on Cisco switch, and as result!
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