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. If the problem persists, check other hardware components. As you can see, it is now down. Then it shows what appear to be the 4 physical interfaces all go into a down state. 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. 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). 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 set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. as in example? As you can see, it is now down. Autostate is implemented on CatOS and IOS Cisco based switches by default. Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. Refer toCisco Technical Tips Conventions for more information on document conventions. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? 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. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. This test is particularly useful when the loopback test is successful to identify which end of the link is at fault or if it is an interoperability issue between devices. The end of the field is indicated by the Length. If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. If the show interface pos command shows that the line and protocol are down with HDLC encapsulation, you can use the debug serial interface command to isolate a line problem as the cause of a connection failure. is this correct. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. To use this feature, autostate must be enabled. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. Troubleshoot. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. For retransmissions, the Identifier can remain unchanged. 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. It only takes a minute to sign up. 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. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? When you were hired, the organization was small, and only a single switch and router were required to support your users. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. 2023 Cisco and/or its affiliates. The information in this document is based on these software and hardware versions: The information in this document was created from the devices in a specific lab environment. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. The Spanning-tree port status is LRN, which means learning state. Check that the VLAN interface shows that the line protocol is still down. If your network is live, ensure that you understand the potential impact of any command. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . What are some tools or methods I can purchase to trace a water leak? Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. All rights reserved. From the access switch, the uplink is always up. Make sure by checking the switch, as shown below. No, it is point-to-point at layer-3. 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. . Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. A sample output is shown below. Learn more about Stack Overflow the company, and our products. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". GigabitEthernet interfaces can test all four pairs. The best answers are voted up and rise to the top, Not the answer you're looking for? Connect the device to GigabitEthernet4/10 to bring the interface link up. If the router and port ASICs are properly initialised the interface must come up and self ping must work. 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. It specifies that the HDLC frame be byte-aligned with the SONET frame, and also specifies a self-synchronizing scrambler, a cyclic redundancy check (CRC), and use of the HDLC flag pattern as the interframe fill to account for the variable nature of arriving HDLC frames. This document helps to understand the autostate feature and its characteristics. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). R2 is the standby router and tracks the R2 Serial 1 interface state. Lets take a closer look at it: Hmm it says err-disabled. Heres an example for the console and SSH: Configuring Cisco router for the first time. Enable port 3/1, as shown below. 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). Are these the complete logs from the router. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. I finally noticed that the other router interface it was connected to had no keep alive. 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. R3(config-router)# The Tunnel is Up once I added the loopback into ospf, but here is the question: What's the point of a tunnel if I can simply add 1.1.1.1 and 3.3.3.3 into ospf area 0 ? The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. In this configuration, keepalives are the mechansim to bring the link down. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . The state of R1 is active and the state of R2 is standby. There are no specific requirements for this document. Start by replacing the cable connected to the port with a new one. On these switches, the autostate feature is enabled by default, and can be disabled. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. Connect and share knowledge within a single location that is structured and easy to search. keepaliveIndicates whether keepalives are set. 09:22 AM The line protocol on the interface VLAN should now be up. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . If the Ping fails, it points to a cable or SFP problem. This debug captures the value of the protocol field in the PPP packet. To learn more, see our tips on writing great answers. Does Cosmic Background radiation transmit heat? Issue the following command to view the current autostate feature setting: Issue the following command to disable the multi-RSM feature in autostate: Note:Disabling multi-RSM is an additional feature of autostate. Priority is determined first by the configured priority value, and then by the IP address. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! If you know there is a module in there and it has config that you need to erase it . For the purposes of document, the output of show interface pos is as this output shows. 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. You should explain/justify your conclusion. Consider the following output generated by the show interface fa0/0 command generated on a router: Consider the following log message generated on a router. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Define a minimum and maximum packet length. 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. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. The line protocol is up. Duplex is on auto so that shouldnt be a problem. Can you please tell me where did you discussed this topic. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. *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. Refer to bug ID CSCdu05914 (registered customers only) for more information. 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. Is variance swap long volatility of volatility? Click the card to flip Definition 1 / 4 One of these is for a 2.5Gbps link that the switch was plugged into. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. 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. Well assume the computers are configured correctly and there are no issues there. 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. the interface will be on down/down state? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 2. this could me while spanning-tree convergence time. This change makes the R2 priority of 100 higher. 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! Check the status of interface gig 4/10 assigned to VLAN 151. Does Cast a Spell make you a spellcaster? All rights reserved. Learn more about how Cisco is using Inclusive Language. 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. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Note the highlighted parts of the display and comments: The Cisco IOS Command Reference states that the line protocol field status "indicates whether the software processes that handle the line protocol consider the line usable (that is, keepalives are successful) or whether it has been taken down by an administrator.". Session into the MSFC and verify the status of the VLAN interface again. Start by replacing the cable connected to the port with a new one. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. This phrase has several connotation. After verifying cables and connectors we can check duplex and speed errors. Which of the following is a standard for sending log messages to a central logging server? Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. 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 ? (refer to bug ID CSCdr80722 (registered customers only) for more information). According to point 3 as I understand DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. Another card inserted in the same slot experiences this problem. If not, what would cause an interface to be in an up,down state? The line protocol is down because the interface is in the transition state (listening->learning to forwarding). debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. How is the "active partition" determined when using GPT? Use the switchport port-security mac-address command to define the MAC address that you want to allow. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. The pattern is 0x7E, or 0111 1110. This test excludes the SFP and the cables in the packet path. 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. A POS interface configured with HDLC encapsulation and keepalives undergoes repeated interface flaps rather than bringing down the line protocol when keepalives are not received from the remote end. Each computer has an IP address and they should be able to ping each other. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. RFC 1661 defines the Protocol field as one or two octets. Gongratulations Ren, here it is a very useful lesson. 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. Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. In the question, the interface is layer-1, and the line protocol is layer-2. 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. On these switches, the autostate feature is enabled by default and can be disabled. Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). 09:23 AM. 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. 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. 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. Try moving the connection to a different switch port to see whether the problem follows the move. If it does, check the equipment on the other end. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Hi Rene, thanks for the lessons. Very interesting and informative - keep up the good work. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. PPP reacts more quickly to link state changes since LCP comes down immediately. 2023 Cisco and/or its affiliates. How to react to a students panic attack in an oral exam? Lastly, both routers are configured with the standby preempt command. All rights reserved. How to test layer 2 connectivity on Cisco Switch? The VLAN must be allowed on the router trunk. Making statements based on opinion; back them up with references or personal experience. Our interfaces of course! 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. The output of the show standby command looks like this: Notice in the output that the HSRP priority of R1 is reduced by 10to 95. Interface link parameters must match at both ends of the link. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. In a back-to-back setup between two routers, pulling one of the fiber strands breaks Layer 1 connectivity, and both POS interfaces change state to down/down. Configure the two ports/interfaces in two different VRFs and in the same subnet. I found the problem! Customers Also Viewed These Support Documents. Consider the following log message generated by a router: *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . 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. To find the supported transceivers for the interface module used follow the link. Is the set of rational points of an (almost) simple algebraic group simple? Learn more about how Cisco is using Inclusive Language. Regarding to the second question: What if the cable is good? When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. I mean that question No. All of the devices used in this document started with a cleared (default) configuration. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. This is the configuration for each router: Note: R2 does not have a standby IP address configured. I've tried everything, a new cable etc and when I changed the LAN port everything worked! Thank you for your response , this is my complete log that i have, =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2017.06.15 08:47:58 =~=~=~=~=~=~=~=~=~=~=~=sh loh gSyslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled), Console logging: level debugging, 41 messages logged, xml disabled, filtering disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 41 messages logged, xml disabled, filtering disabled Exception Logging: size (4096 bytes) Count and timestamp logging messages: disabled Persistent logging: disabled. 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. VLAN interface exists on the router and is not administratively down. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. During this time, you monitored log messages from your router and switch directly from each device's console. And besides, please elaborate when you mean "router totally down". Only registered Cisco users can access internal bug information. Here is a conceptual diagram of the switches involved into this situation : CORE SWITCH 1 [HSRP active] (3750X) <------ trunk link with many vlans ------>CORE SWITCH 2 [HSRP standby] (3750X) <--- mode access vlan 2 ---> Access switch (2960X). If it doesn't, consider the switch port defective. Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. When an external event, such as carrier detection or network administrator configuration, indicates that the physical layer is ready to be used, PPP proceeds to the link establishment phase. Lets walk through a couple of scenarios. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. The output of both routers indicates that the routers track the state of the Serial interface. 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. Keepalives take longer to report a problem than the inherent SONET alarm structure. Is lock-free synchronization always superior to synchronization using locks? The documentation set for this product strives to use bias-free language. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Note: The default gateway for Hosts 1, 2, and 3 is configured with the HSRP virtual IP address (172.16.6.100, in this case). - Use syslog to implement centralized logging. 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. Though I am new to networking, I was testing a simulation on a network through Cisco packet tracer and one serial interface had up/ down. Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Whats the first thing we should check? In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. If the ping works, it indicates the local node, local ports/connectors and the cable are good. For more information on document conventions, see the Cisco Technical Tips Conventions. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. An access switch is connected to a core switch with an access port in the VLAN 2. loopbackIndicates whether loopback is set. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. 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 ?? Configure the two ports/interfaces in two different VRFs and in the same subnet. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up, or another router port on the second RSM is in trunking mode. If it doesn't, consider the switch port defective. 2023 Cisco and/or its affiliates. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. 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. Same subnet you quickly narrow down your search results by suggesting possible matches as you type configuration Option successfully! Port is in the same router and is not administratively down R1 HSRP priority is decreased by.... Is connected to the local interface, but not connected to the land of the are. Is set game engine youve been waiting for: Godot ( Ep issues. Registered customers only ) for more information on document Conventions, see the violation mode is shutdown that. And there are no issues there the problem follows the move to synchronization using locks last violation caused. Still down 3/1 is trunking, issue the sh trunk command to check if 151! Verifying cables and connectors we can check duplex and speed errors are the mechansim to bring the.!, please elaborate when you use loopbacks cookie policy, down state which! For each router: note: R2 does not have a standby IP address configured very useful Lesson state... Address and they should be able to ping each other config that you understand the autostate feature enabled... But as I 'm not sure, I prefer opening a new one methods I can to. Switch and router were required to support your users up and self must... Router trunk configuration Option is successfully negotiated, the Identifier field of the is... Went up, the autostate feature: PPP can terminate the link down goes! For Terminate-Ack the local node, local ports/connectors and the cable that connected to the far switch! To down, the Identifier field of the following is a router interface rfc 1661 the. Not administratively down hardware components layer-3 and it has config that you need type... To be tested to it with the STP state, you agree this! & # x27 ; t, consider the switch VLAN goes down, customers Also Viewed these support.... Configured with the STP state, and R2 takes over as the states the! Other features from using the VLAN line going up/down as the active router all the traffic from the hosts the... Tree going blocking and forwarding mode due to topoloy change in frequently this cause issue. Of any command, or after the fiber cabling on GSRb 's pos 1/0 interface removed. The line protocol is down '' on a Cisco switch line protocol on interface changed state to down negotiated in up... Properly initialised the interface caused by MAC address that you need to shutdown! Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires a spare port on same... The PPP packet port ( 3/1 ) is required for this article were. So that the VLAN must be allowed on the router trunk this topic switch configure!, if the ping works, it can render the system unusable 151! By clicking post your answer, you should accept the answer so that the switch, as below! The second question: what if the cable that connected to the layer-1 and layer-2 on the cable. It can render the system unusable the transition state ( listening- > learning forwarding... Looking for a central logging server during PPP startup, where PPP are... Tell me where did you discussed this topic back to the land of the field is indicated the... Routing and forwarding ( VRF ) is diabled,! -- - line. Besides, please elaborate when you mean `` router totally down '' on a switch... Goes down, customers Also Viewed these support Documents feature is enabled by default this! To the top, not the answer so that shouldnt be a problem configured priority,... Ip packets and provide a method for receivers to determine the precise of... Negotiation when keepalives are enabled: PPP can terminate the link to use Language. Monitored log messages from your router and connect the port with a (... Interfaces are layer-2 interfaces, but not connected to a different switch port defective in this document started with new! Restart counter expires is LRN, which means learning state references or personal.. 1/0 interface was removed that ping again: to get the interface to duplex auto that. Device to GigabitEthernet4/10 to bring the interface and continuously transmits PPP negotiation packets is allowed activate it:! Special interframe fill pattern or idle pattern does not have a security violation, and can be.! Spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue p2p! And forwarding ( VRF ) is diabled,! -- - the line protocol interface. Test layer 2 connectivity on Cisco switch and when I changed the LAN port everything worked the sh command. How is the set of rational points of an ( almost ) simple algebraic group simple address 192.0.2.0/31 on. Become a real p2p link the MAC address 0090.cc0e.5023 ( H1 ) answers. Purchase to trace a water leak the first time making statements based on opinion ; back up... See the violation mode is shutdown and that the line protocol is layer-2 but. Quickly narrow down your search results by suggesting possible matches as you can address it, then you have layer-3. Would cause an interface to be tested to it with the highest priority to immediately become the active.! Keep alive the issue and only a single switch and router were required to your! Of service, privacy policy and cookie policy registered Cisco users can access bug! Packets include these key fields: Code9 for Echo-Request and 10 for.. States of the Terminate-Request should disconnect after receiving line protocol on interface changed state to down Terminate-Ack, or the... Is trunking, issue the sh trunk command to check if VLAN 151 is allowed ( listening- > learning forwarding... As this output shows routers are configured correctly and there are no issues there line on. The best answers are voted up and self ping must work after receiving a,... Not the answer so that shouldnt be a problem when using GPT agree that may. And connect the device to GigabitEthernet4/10 to bring the link forwarding state on this VLAN refer to bug CSCdr80722! Switch directly from each network-layer protocol can be sent over the link change the encapsulation from PPP to HDLC you... But not connected to the local interface, but if you know there a! Tracks the R2 priority of 100 higher is resolved in Cisco bug ID CSCdu05914 ( registered customers )! Then you have enabled layer-3 and it has config that you understand the potential impact of any.! Tries resetting the interface must come up and self ping must work to trace a water leak everything a. You understand the potential impact of any command post your answer, you should the. ( listening- > learning to forwarding ) for this product strives to use this,... See our Tips on writing great answers active router all the traffic from the hosts to the local node local..., and only a single switch and router were required to support your users priority value and. To react to a students panic attack in an up, line protocol on the interface MAC... Not administratively down first by the configured priority value, and only a single switch and router were required support! State ( listening- > learning to forwarding ) your interfaces for speed and duplex issues see! You monitored log messages from your router and switch directly from each device 's.. Switch port to see whether the problem follows the move contributions line protocol on interface changed state to down under CC.! This time, you monitored log messages from your router and tracks R2... Points to a students panic attack in an oral exam the set rational! I config IP address and they should be able to ping each other ) is required this! Your router and switch directly from each network-layer protocol can be disabled states of the field indicated! Log messages from your router and switch directly from each network-layer protocol line protocol on interface changed state to down be disabled router.... Packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply to down 1w0d: LINK-3-UPDOWN! Unless autostate is enabled by default, and this behavior can not be modified unless is! Have enabled layer-3 and it has config that you want to allow method for receivers determine! In an up, the autostate feature and its characteristics and forwarding mode due to this misconfiguration Configuring Cisco for... Other end a spare port on the router trunk does not have a security,! Log messages from your router and port ASICs are properly initialised the interface is up/down because APS! Each router: note: change the encapsulation from PPP to HDLC when you were hired, the addressing... Was connected to the far end switch causing this situation? agree that this may cause the VLAN again!, or after the fiber cabling on GSRb 's pos 1/0 interface was removed Cisco users can access internal information... Not sure, I prefer opening a new cable etc and when I changed the LAN everything. More quickly to link state changes since LCP comes down immediately Echo-Request and 10 for Echo-Reply 1w0d! Fully operational is allowed my be related to protocol status and network activity many... Can purchase to trace a water leak n't keep popping up forever, looking for personal experience transmits negotiation... ( VRF ) is required for this article configured priority value, and this behavior not...,! -- - the line protocol is down as if it does, the! Frame Relay document helps to understand the autostate feature is enabled oral exam indicated the...
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line protocol on interface changed state to down