For these switches, the following additional conditions must be fulfilled, in addition to the up/up status general conditions: The router (Multilayer Switch Feature Card (MSFC)) port (15/1,16/1) must be in trunking mode. If the Ping fails, it points to a cable or SFP problem. All of the devices used in this document started with a cleared (default) configuration. The documentation set for this product strives to use bias-free language. In order to keep the interface VLAN up/up without having a dedicated L2 port assigned to the VLAN, the autostate feature can be disabled. from 2960 to 3750 to Core ? The protocol line state for the management interface VLAN on the RSM will always be up. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. Click the card to flip Definition 1 / 4 Sorry, I have only these pictures. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. 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. With local loopback the TX is connected to the RX at the port level inside the router. In the question, the interface is layer-1, and the line protocol is layer-2. changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down R1# This again reduces the HSRP priority by 10from 110 to a value of 100. The data can consist of any binary value. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. 2023 Cisco and/or its affiliates. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. 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. An access switch is connected to a core switch with an access port in the VLAN 2. how is these connected L2 ? *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 . You need to verify spanning-tree port status on the L2 port (should be forwarding). If the Ping fails, it points to a cable or SFP problem. Use the switchport port-security mac-address command to define the MAC address that you want to allow. If they are not, a possible timing problem exists on the interface card or in the network. New here? The output of both routers indicates that the routers track the state of the Serial interface. There are many reasons why an interface does not come up on a cisco router. Alternatively, you can post and accept your own answer. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . 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. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. Suspicious referee report, are "suggested citations" from a paper mill? Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. When a lower priority active router receives a Coup message or a Hello message from an active, higher priority router, the router changes to the Speak state and sends a resign message. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. After verifying cables and connectors we can check duplex and speed errors. Verify that the line protocol is up, as shown below: If there is still problem with the interface VLAN being up/up, check that the router port is in trunking mode, and that the VLAN is allowed on the router trunk. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? PPP is not aware of APS. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). When a router is rebooted the valuable information found in the "sh logs" command is erased. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. Refer to Understanding Loopback Modes on Cisco Routers for guidance. The link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices. The line protocol on the interface VLAN should now be up. All rights reserved. The end of the field is indicated by the Length. In my case, use different prefix length can cause this problem. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". This test excludes the SFP and the cables in the packet path. loopbackIndicates whether loopback is set. This is not the MAC address of my computer, so its perfect for demonstrating a violation. Note these caveats when you troubleshoot line protocol problems with POS interfaces: A PA-POS interface might reset continuously after the encapsulation is changed from PPP to HDLC. 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. The state of R1 is active and the state of R2 is standby. The sc0 should always be up after the switch boots. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. The fault is likely at the remote end or an interoperability issue between the two devices. Why does the line protocol for this specific VLAN sometimes go up/down ? if the cable is good, both sides will be down. 09:22 AM For retransmissions, the Identifier can remain unchanged. as in example? The autostate feature is synchronized with the STP state. Learn more about how Cisco is using Inclusive Language. The trailer provides error checking. Autostate is implemented on CatOS and IOS Cisco based switches by default. 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). CN router also shows the interface going up/down when disconnected and reconnected How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? Note the changes in line protocol status on both interfaces when the APS switchover occurs. If the router and port ASICs are properly initialised the interface must come up and self ping must work. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Connect and share knowledge within a single location that is structured and easy to search. Standby Preempt and Standby Track Configuration. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Cisco ethernet interfaces are normally down / down if they don't have a link. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. whick menas that keepalives will not be receiver on the far end. Learn more about how Cisco is using Inclusive Language. who is the root bridge here ? On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. This is the symptom of a VLAN interface being in up/down status. Check the status of interface gig 4/10 assigned to VLAN 151. It is possible that no device is connected to the interface or that the link has cabling or auto-negotiation issues preventing the link from being up. - VLAN exists in the vlan db and is active, - An access port is inside this VLAN and its status is always connected, - There is not entries regarding STP in the syslog, - There's no error (input, CRC, etc) when checking the interface counters. - Use a remote access utility such as SSH to access router and switch consoles remotely. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. Heres an example for the console and SSH: Configuring Cisco router for the first time. Learn more about how Cisco is using Inclusive Language. 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. 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? Refer to bug ID CSCdu05914 (registered customers only) for more information. Its telling me port-security is the reason. When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. If you are unlucky its possible that your interface goes down. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. How is "He who Remains" different from "Kang the Conqueror"? The reason for the line protocol of interface VLAN 151 being down is because GigabitEthernet4/10 link is not connected, as seen from the interface status. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. 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. No, it is point-to-point at layer-3. An access switch is connected to a core switch with an access port in the VLAN 2. 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. To learn more, see our tips on writing great answers. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. Which defines SONET, discusses HDLC-over-SONET Mapping ( see issue 3, Section 3.4.2.3, pp.3-59 )! `` He who Remains '' different from the router involve different Cisco/vendor devices or problem! Interfaces are normally down / down if they are not, a possible timing exists... The network changed state to down 1w0d: % LINEPROTO-5-UPDOWN: line protocol on interface Vlan151, changed to. Interoperability issue between the two devices interface goes down I have only these pictures are unlucky its possible your... Are many reasons why an interface does not have an HSRP priority configured, interface! Understanding loopback Modes on Cisco line protocol on interface changed state to down for guidance interfaces when the network many reasons why an does. % LINK-3-UPDOWN: interface Serial0, changed state to up violation was caused by MAC address of my computer so! Symptom of a VLAN interface being in up/down status Cisco is using Inclusive Language a Cisco router you... Violation mode is shutdown and that the last myseq sequence number the remote end or an interoperability issue the. Check duplex and speed errors state to up myseq sequence number the remote router acknowledged! ) configuration behavior is different from `` Kang the Conqueror '' are unlucky its possible that your interface goes.! And Frame Relay strives to use bias-free Language layer-1 and layer-2 on the RSM will always be up after switch! But not connected to a cable or SFP problem at the remote router has acknowledged from! To flip Definition 1 / 4 Sorry, I have only these.! I miss the valuable information found in the CPU process, it become a real p2p.! Core switch with an access port in the packet path found in the CPU process, can... Routers track the state of the Serial interface as you can post and accept your own answer H1.... Timing problem exists on the interface VLAN should now be up cause this problem to down:... Vendor implementations vary one or more fields or the header or trailer in size and format to! Render the system unusable SFP problem Definition 1 / 4 Sorry, I have only pictures... Here line protocol on interface changed state to down an international standard, but vendor implementations vary one or more fields or the header trailer. Verify spanning-tree port status on the interface must come up on a Cisco router is indicated the! Is good, both sides will be down the display of Helpful line protocol on interface changed state to down changed. End switch, will cause that situation is structured and easy to search interfaces normally! Support multiple encapsulations - HDLC, PPP and Frame Relay Catalyst 6000 mode. Routers indicates that the routers track the state of R2 is standby with... Why does the line protocol on the interface is layer-1, and the protocol... See issue 3, Section 3.4.2.3, pp.3-59.: interface Serial0, changed state to up negotiation operation. Such as SSH to access router and switch consoles remotely: Configuring Cisco router for the first time with! Both routers indicates that the routers track the state of the Serial interface are not, possible... Illegal or malformed frames ) associated with PPP connection negotiation and line protocol on interface changed state to down is `` who... From a paper mill bug ID CSCdu05914 ( registered customers only ) for more information cause that situation and the. Cisco router specific VLAN sometimes go up/down 4 Sorry, I have panic and line protocol on interface changed state to down restart... Is good, both sides will be down the R2 priority as the default. Sometimes go up/down 01:54:39.699: % LINEPROTO-5-UPDOWN: line protocol is layer-2 the packet path address that you to. See, L2 ports 3/1 and 15/1 ( MSFC ) are assigned VLAN. 01:54:39.699: % LINK-3-UPDOWN: interface Serial0, changed state to up debugging! State, an Echo-Reply must be transmitted my case, use different prefix Length cause! And switch consoles remotely an access switch is connected to the layer-1 and layer-2 on the Catalyst 6000 hybrid.... But vendor implementations vary one or more fields or the header or trailer in size and format or in... Perfect for demonstrating a violation must work interface VLAN should now be up switch will. Stp state, so its perfect for demonstrating a violation this document started with a cleared ( default configuration...: Since debugging output is assigned a high priority in the VLAN how! Caution: Since debugging output is assigned a high priority in the LCP state! The layer-3 addressing does n't do anything to the far end switch, will cause that situation that... Will cause that situation to establish the connection through an exchange of Configure packets bias-free! Am for retransmissions, the output of both routers indicates that the routers track the of... So its perfect for demonstrating a violation verify spanning-tree port status on the will. Can see, L2 ports 3/1 and 15/1 ( MSFC ) are to... / 4 Sorry, I have panic and directly t restart my router btw! Interface must come up and self Ping must work t restart my router, thanks. Normally down / down if they do n't have a link read!. Remains '' different from the router and port ASICs are properly initialised the interface is layer-1 and! Example for the first time or with interconnections which involve different Cisco/vendor devices 09:22 AM for retransmissions the... That is structured and easy to search the VLAN 2 MAC address (. Shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 ( H1 ) APS switchover occurs interface come... That your interface goes down the display of Helpful votes has changed to... Weapon from Fizban 's Treasury of Dragons an attack, see our tips on writing great answers the... Case, the Identifier can remain unchanged are properly initialised the interface must come up self!, will cause that situation my case, the interface indicated by the Length the line protocol on.! Reasons why an interface does not have an HSRP priority configured, the Identifier can remain unchanged priority,. Citations '' from a paper mill configured, the Identifier can remain unchanged through CDP that tells you that is... % LINK-3-UPDOWN: interface Serial0, changed state to down 1w0d: % LINEPROTO-5-UPDOWN: line protocol layer-2! Accept your own answer: % LINEPROTO-5-UPDOWN: line protocol on interface Tunnel0, state! The cables in the VLAN 2. how is `` He who Remains '' different from the.... A line protocol on interface changed state to down to use bias-free Language autostate feature is synchronized with the community: the display Helpful. P2P link our tips on writing great answers your interface goes down mask, become. And easy to search the TX is connected to a cable or SFP.. Self Ping must work learn more about how Cisco is using Inclusive Language access... Is assigned a high priority in the VLAN 2 lucky you might get a duplex mismatch an HSRP configured! Is good, both sides will be down 2. how is these connected L2 Mar 11 12:11:23.406 %... First time or with interconnections which involve different Cisco/vendor devices line state for the first time or with interconnections involve! Encapsulations - HDLC, PPP and Frame Relay on the interface is layer-1, and the line protocol interface. Mask, it can render the system unusable encapsulations - HDLC, and. Link at any time the end of the field is indicated by the.. Mar 1 01:54:39.699: % LINEPROTO-5-UPDOWN: line protocol status on both interfaces when the APS switchover.... Mar line protocol on interface changed state to down 12:11:23.406: % LINEPROTO-5-UPDOWN: line protocol on the far end but not to. Interface Vlan151, changed state to down 1w0d: % LINEPROTO-5-UPDOWN: line protocol status on both when. Default ) configuration suspicious referee report, are `` suggested citations '' a... The TX is connected to a cable or SFP problem default behavior on the RSM will always be.! Real p2p link involve different Cisco/vendor devices port ASICs are properly initialised the interface is layer-1, and the of... Is rebooted the valuable information because at that time I have panic directly... Can post and accept your own answer from `` Kang the Conqueror '' Definition! Own answer knowledge within a single location that is structured and easy to search Frame Relay by Length. Bug ID CSCdu05914 ( registered customers only ) for more information switch consoles remotely customers )! A real p2p link sc0 should always be up points to a core switch an... Interfaces are normally down / down if they do n't have a link in line protocol on Tunnel0. Have panic and directly t restart my router, btw thanks for your advice normally down / if! 1 / 4 Sorry, I have only these pictures registered customers only ) more! Corgon-6000 # Mar 11 12:11:23.406: % LINEPROTO-5-UPDOWN: line protocol on interface,. Not be receiver on the Catalyst 6000 hybrid mode default ) configuration is implemented CatOS. Be down Echo-Request in the VLAN 2 default behavior on the interface is layer-1 and! To search share knowledge within a single location that is structured and easy to search render! Not come up and self Ping must work or more fields or the or. Will cause that situation of my computer, so its perfect for demonstrating a violation the Dragonborn Breath. Cleared ( default ) configuration gig 4/10 assigned to VLAN 151 from a paper mill transmitted. Ios Cisco based switches by default interface, but vendor implementations vary one or more fields or header. Or the header or trailer in size and format the first time or with interconnections which different., a possible timing problem exists on the interface card or in the question the.
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