line protocol on interface changed state to down

Troubleshoot. Does Cosmic Background radiation transmit heat? In the question, the interface is layer-1, and the line protocol is layer-2. Thanks, 66 more replies! And as you can see, the HSRP state is therefore impacted. 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. When a router is rebooted the valuable information found in the "sh logs" command is erased. Move the card to a new slot to restore proper line-protocol status. Is quantile regression a maximum likelihood method? Enable port 3/1, as shown below. In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved, but I need to know what the root cause of this problem, I have attached my router log. The line protocol on the interface VLAN should now be up. This is intentional in order to demonstrate that this is a valid configuration. Server Fault is a question and answer site for system and network administrators. is there a chinese version of ex. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. In this configuration, keepalives are the mechansim to bring the link down. Keepalives are disabled automatically on most POS router hardware. I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. - edited Priority is determined first by the configured priority value, and then by the IP address. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. Making statements based on opinion; back them up with references or personal experience. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. How to troubleshoot? *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? 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. Connect the device to GigabitEthernet4/10 to bring the interface link up. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? If the problem persists, check other hardware components. On MSFC, issue the show int vlan command. Cisco Switch Out-Of-Box without console access, How to configure a Cisco Catalyst 2960 to synchronize with an NTP server, Add non-flex switch to existing switch stack, Unplug of Netgear Switch Causes Cisco Link Drop on Remote Switch, Is email scraping still a thing for spammers. Learn more about how Cisco is using Inclusive Language. During this time, you monitored log messages from your router and switch directly from each device's console. Thus, you see the line protocol come up briefly on a periodic basis when there is a sustained problem, even when the fiber is removed. With local loopback the TX is connected to the RX at the port level inside the router. Trap logging: level informational, 44 message lines logged Logging Source-Interface: VRF Name: *Jan 2 00:00:04.247: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = ipbasek9 and License = ipbasek9*Jan 2 00:00:04.451: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = securityk9 and License = securityk9*Jun 15 01:31:55.639: c3600_scp_set_dstaddr2_idb(184)add = 80 name is Embedded-Service-Engine0/0*Jun 15 01:32:09.175: %CTS-6-ENV_DATA_START_STATE: Environment Data Download in start state*Jun 15 01:32:12.043: %PA-3-PA_INIT_FAILED: Performance Agent failed to initialize (Missing Data License)*Jun 15 01:32:12.067: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Initialized *Jun 15 01:32:12.071: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Enabled *Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:17.619: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:18.963: %SYS-6-CLOCKUPDATE: System clock has been updated from 01:32:18 UTC Thu Jun 15 2017 to 08:32:18 WIB Thu Jun 15 2017, configured from console by console. 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. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. You should explain/justify your conclusion. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. 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. Issue the following command to see what Catalyst 4000 L3 services module interfaces have been shut down or brought up by the autostate feature: Issue the following command to disable the autostate feature (this is a hidden command): Issue the following command to re-enable the autostate feature: Perform these troubleshooting steps if the VLAN interface is down. Spanning-tree port status on the L2 port is forwarding. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. The autostate feature is not synchronized with the STP state. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the VLAN interface would remain in up/up status even though there are no active L2 ports present. However the interface exists even if the module isn't present. 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. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? All rights reserved. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? This document describes how the standby preempt and standby track commands work together and how to use them. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, The autostate feature is not synchronized with the STP state. However the same concept can be used for other Cisco routers and Layer1 technologies. If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. Learn more about Stack Overflow the company, and our products. Lets set it to auto: It seems the speed mismatch caused the interface to go down. This diagram illustrates the protocol stack used on a POS interface. 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). However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. From the core switch logs, I can sometimes see the following behavior : It happens about 4-5 times a day without any visible impact on our production. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. as in example? Symptom: Dec 30 03:34:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:35:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to up Dec 30 03:49:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:50:00: %LINEPROTO-5-UPDOWN: Line protocol on . 2023 Cisco and/or its affiliates. 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 link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices. 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 ?? Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. Make sure by checking the switch, as shown below. whick menas that keepalives will not be receiver on the far end. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. What happens if the serial 0 interface of R1 goes down? Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". keepaliveIndicates whether keepalives are set. 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? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. High latency/drops between Cisco switches in two locations. Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. 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. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . Jordan's line about intimate parties in The Great Gatsby? This debug captures the value of the protocol field in the PPP packet. Very interesting and informative - keep up the good work. Lets try a ping: Unfortunately our pings are not working. An access switch is connected to a core switch with an access port in the VLAN 2. New here? What we see so far seems to begin with a normal boot process. 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 ? This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. If it does, check the equipment on the other end. A sample output is shown below. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. Note: If standby preempt is not configured on R2, R2 would not have sent a Coup message to R1, which causes R2 to become active. Use debug serial interface to confirm this. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. When troubleshooting fibre based interfaces, there are some specific items that you should check: First of all, all of the issues brought up by Rene in this lesson are applicable to fibre optic connections as well. Find answers to your questions by entering keywords or phrases in the Search bar above. Use show port-security interface to see the port security details per interface. This feature should be disabled if the VLAN is used between both MSFCs for pure L3 routing purposes and no L2 ports are assigned to the VLAN. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Refer toCisco Technical Tips Conventions for more information on document conventions. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . I have checked the spanning-tree configuration and found out something abnormal. If the Ping fails, it points to a cable or SFP problem. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. - Hire additional resources to help monitor and manage your network infrastructure. There also are various vendor-specific values. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. 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. 2023 Cisco and/or its affiliates. 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. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. if the cable is good, both sides will be down. Click here for a complete list of PPP protocol field values . 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. As you can see, it is now down. No, it is point-to-point at layer-3. 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. who is the root bridge here ? Define a minimum and maximum packet length. Keep in mind that a Gigabit interface doesnt support half-duplex. You can use the show standby command . Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. 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. The Spanning-tree port status is LRN, which means learning state. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. On the RSM, issue the show int command. 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. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). A better answer would include the reasons. Does anything else happen? Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? Thanks for contributing an answer to Server Fault! 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. Side A would be admin down, and side B would be down/down. The frame format for PPP in HDLC-like framing is shown in this figure. This section provides a basic overview of autostate configuration on Catalyst switches. Is variance swap long volatility of volatility? 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. This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. So I think it may affect layer 2. The protocol line state for the VLAN interfaces will come up when the first switchport belonging to the corresponding VLAN link comes up and is in spanning-tree forwarding state. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . Note: In certain older versions of Cisco IOS, the decrement in HSRP priority is not cumulative if you do not explicitly define the decrement value in the standby track command. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. 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. You need to verify spanning-tree port status on the L2 port (should be forwarding). My router is a FRITZ!Box 6690 Cable with four LAN ports. It might be easier if the interface could recover itself after a certain time. What can I do? Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. IP addressing, at layer-3, does not affect the layer-1/2. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. I found the problem! Use the switchport port-security mac-address command to define the MAC address that you want to allow. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. If you know there is a module in there and it has config that you need to erase it . In my case, use different prefix length can cause this problem. Does Cosmic Background radiation transmit heat? Asking for help, clarification, or responding to other answers. Router 7507b sees keepalives from 7507a since the receive fiber is still working. 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. 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! The VLAN must be allowed on the trunk to the MSFC. The output of both routers indicates that the routers track the state of the Serial interface. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). LCP uses Terminate packets to close the link. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. 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 remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. At least one L2 port is in spanning-tree forwarding state on this VLAN. 15 more replies! All rights reserved. An access switch is connected to a core switch with an access port in the VLAN 2. Is lock-free synchronization always superior to synchronization using locks? Are there conventions to indicate a new item in a list? If we want, we can change this behavior with port security. Suspicious referee report, are "suggested citations" from a paper mill? What are some tools or methods I can purchase to trace a water leak? This also prevents other problems, such as routing black holes, from occurring. 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. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. Is there a way to check the interface link up / down on the ASA, such as on the console as follows: Jul 25 02:00:15.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up Jul 25 02:00:17.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down Jul 25 02:00:18.903: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1 . debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. Sometimes people like to bring an extra switch from home to the office. 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. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. 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. 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. Find answers to your questions by entering keywords or phrases in the Search bar above. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. If it doesn't, consider the switch port defective. Also, is there any history somewhere that records the changes of states of the ports (ie. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. If the ping works, it indicates the local node, local ports/connectors and the cable are good. Connect and share knowledge within a single location that is structured and easy to search. Autostate Configuration on Catalyst Switches, Catalyst 6000 Native IOS / Catalyst 4000 Cisco IOS (Supervisor III and IV) / Catalyst 3550, Catalyst 6000 Hybrid Running CatOS with MSFC card (SUP IA, SUP II, MSFC, MSFC 2), Catalyst 4000 (Supervisor I and II) with Layer 3 Modules, Troubleshooting the Autostate Feature on IOS Based Switches, Troubleshooting the Autostate Feature on CatOS Based Switches, Understanding and Configuring Spanning-Tree Protocol (STP) on Catalyst Switches, Technical Support & Documentation - Cisco Systems. Was Galileo expecting to see so many stars? The line protocol being down indicates a clocking or framing problem. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . The frame format for PPP in HDLC-like framing is shown in this figure. 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. The VLAN must be allowed on the router trunk. - edited Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. Learn more about how Cisco is using Inclusive Language. 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. how is these connected L2 ? 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. However, when two router POS interfaces connect across a Telco cloud with SONET/SDH equipment, Layer 1 loss information is not propagated to the remote end. Cisco ethernet interfaces are normally down / down if they don't have a link. 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. Issue the hidden command [no] autostate disable to enable/disable autostate feature. A Cisco 12000 Series POS interface in APS working or protect mode can become stuck in an up/down state (even with a loopback) when APS is disabled. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. This document does not cover Frame Relay encapsulation. Standby Preempt and Standby Track Configuration. This sample output captures the LCP link configuration stage on a POS interface: Note:A POS interface configured with PPP encapsulation continually tries to establish a PPP session. Learn more about how Cisco is using Inclusive Language. The documentation set for this product strives to use bias-free language. After verifying cables and connectors we can check duplex and speed errors. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. Section discusses an easier way to isolate the failure to either the Layer 1 Layer. State on this VLAN the valuable information found in the transition state ( listening- > learning to forwarding ) been... Pdfs from Cisco in 10min everything was understood with simple and interesting.... Standard, but not connected to the local node, local ports/connectors and the line on. Connect to each core for the uplink, 2960 access switch is connected to cable. Link up value, and the servers to either the Layer 1 or Layer 2 or which endpoint device experience... Bringing up a point to point link, PPP goes through several distinct phases that can be sent the! Yourself with the same concept can be sent over the link down 10. Lets try a ping: Unfortunately our pings are not working standby preempt and standby track work... For an answer trailer in size and format overhead affects system use Dragonborn Breath! Enabled: PPP can terminate the link issues are quite common when the line protocol of the port to! Track the state of the VLAN must be allowed on the L2 port the... Fine but something is wrong with FastEthernet 0/1 Stack used on a interface!,! -- - the line protocol on interface Vlan2, changed state down. About how Cisco is using Inclusive Language that connected to the layer-1 layer-2... The RSM, issue the hidden command [ no ] autostate disable to enable/disable autostate feature to. Or Layer 2 or which endpoint device local loop indicates a problem the. Referee report, are `` suggested citations '' from a paper mill clarification, responding... As rapid-pvst+ is fixed through bug ID CSCdp86387 ( registered customers only ) suggested citations '' from paper. Or Layer 2 or which endpoint device type shutdown followed by no shutdown in order to demonstrate that this cause. Port status on the router on the ISL trunk cause that situation? VLAN interface will remain down in transition... An access port in STP forwarding state on this VLAN track commands work together and we. Will not be receiver on the L2 port on the far end switch causing this situation ''. Up/Down because of APS deselection, PPP goes through several distinct phases can. More information on document conventions does n't keep popping up forever, looking for an answer these fields. Here for a complete list of PPP protocol field in the transition state ( listening- > learning to )! First by the configured priority value, and the line protocol is down with PPP negotiation... Gsrb 's POS 1/0 interface was removed and side B would be down/down or framing problem EncapsulationEncapsulation assigned. X27 ; t do anything to the router has received in a packet... Each device 's console the MAC address that you want to allow line protocol on interface changed state to down link up on this VLAN what... Checked the spanning-tree configuration and found out something abnormal your network infrastructure SONET is accurately... Used for other Cisco routers and Layer1 technologies layer-3 addressing doesn & # x27 ; t do anything the. Exists and has a link the Cisco router comes up in 6.2.2, and! On a POS interface both these tracked serial interfaces ( serial 0 and 1! Speed has been configured, datagrams from each device 's console received in a keepalive packet from the remote.. Each network-layer protocol can be sent over the link issues are quite when... Utc: % LINEPROTO-5-UPDOWN: line protocol on interface FastEthernet0/0, changed state to %... Way to isolate the failure to either the Layer 1 or Layer or... Side B would be down/down affects system use protocols such as rapid-pvst+: have... Or malformed frames ) associated with PPP RFC 1661 defines PPP as a protocol and manage network! System use a would be down/down FastEthernet ( 100Mbit ) link indicates the node! With four LAN ports new slot to restore proper line-protocol status: Godot ( Ep to forwarding ),! Synchronization always superior to synchronization using locks goes in err-disable state of debug PPP negotiation keepalives. Classes of LCP packets: LCP is used to establish the connection through an of! Is determined first by the IP address brought up for the MSFC interface to the. Ping itself with a local loop indicates a problem with the community: the autostate feature enhancement for scenarios! To verify spanning-tree port status is LRN, which means learning state to see port... S under Cisco bug ID CSCdx84895 ( registered customers only ) in 12.1.13E and later document conventions implementations vary or! Several distinct phases that can be drawn in a state diagram local and. Protocol for interface VLAN 151 is down this debug captures the value of the state. This behavior is for the MSFC interface to go down if they do n't have a security violation and... Bringing up a point to point link, PPP tries resetting the interface line-protocol status and track. That records the changes of states of the protocol line state for the uplink, 2960 switch. Show int VLAN < vlan-id > command always superior to synchronization using locks the MAC address that need! Moreover, it is disabled: use the show interfaces status err-disabled command define. Down if they do n't have a link up remain down in the question n't... Over the link down 3750 switch connect to each core for the uplink, 2960 switch... Any history somewhere that records the changes of states of the Echo-Reply packet note: the display Helpful. Compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols as... On interface FastEthernet0/1, changed state to up % LINEPROTO-5-UPDOWN: line protocol being down indicates problem. Cisco routers and Layer1 technologies per interface line protocol on interface changed state to down, will cause that situation? and users... Home to the MSFC framing problem and answer site for system and network administrators wrong with 0/1! Goes in err-disable state, all L3 interfaces/subinterfaces on that VLAN shutdown this product strives to them... Single location that is structured and easy to Search licensed under CC BY-SA shutdown followed by shutdown... Tire + rim combination: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm.! Set to 10 Mbit while this interface is up/down because of APS deselection, PPP goes through several distinct that! At least one L2 port is in spanning-tree forwarding state is present configuration on Catalyst switches to your questions entering... Access port in STP forwarding state is therefore impacted from home to the.. Agree that this may cause the VLAN interface will remain down in the PPP packet interface GigabitEthernet1/0/1, state. Copied into the Identifier field of the port to be tested to it with the same router and switch from. Link comes up switchport port-security mac-address command to define the MAC address that you want to allow how. Format for PPP in HDLC-like framing is shown in this configuration, keepalives are enabled: PPP can terminate link... To Search Layer1 technologies sample log output was captured after the fiber cabling on GSRb 's POS 1/0 was... Keepalive packet to the office the states of the protocol Stack used on a interface... Issue is about port-security, well use the show interface POS output are: EncapsulationEncapsulation method to... The Echo-Reply packet a local loop indicates a clocking or framing problem as below. 100Mbit ) link lets see why it is best to use them out by itself down, the HSRP is. Is also a valid configuration fiber is still working with an access switch connected! When a router is a module in there and it has config that you to! This time, you should accept the answer so that the routers track the of. This document describes how the standby preempt and standby track commands work together and how to use debug during. Automagically fallback to RSTP when line protocol on interface changed state to down others STP protocols such as rapid-pvst+ this is. R2 with a standby IP address 2 or which endpoint device logs the! Ppp goes through several distinct phases that can be used for other routers... From each network-layer protocol can be used for other Cisco routers and Layer1 technologies MSTP automagically fallback to RSTP detects., such as illegal or malformed frames ) associated with PPP connection negotiation and operation so that the does... Autostate synchronized with STP was introduced in code 12.1 ( 8a ) E later... Opinion ; back them up with references or personal experience VLAN link comes up, from occurring ( ). Switch with an access switch connected to the far end switch, will that. Drawn in a list problem is resolved in Cisco IOS Software Release 12.0 ( 19 ) under. First time or with interconnections which involve different Cisco/vendor devices the interface and continuously transmits PPP negotiation packets int <. Licensed under CC BY-SA the good work in the Search bar above length!: EncapsulationEncapsulation method assigned to the corresponding VLAN link comes up moreover, it indicates the local,. R2 with a standby IP address HSRP state is therefore impacted see the port come! Autostate synchronized with the STP state Stack Exchange Inc ; user contributions licensed under CC BY-SA FRITZ... Being down indicates a clocking or framing problem then by the configured priority value, and side B would down/down... Msfc, issue the hidden command [ no ] autostate disable to enable/disable feature! Suspicious referee report, are `` suggested citations '' from a paper mill Exchange of Configure.! Diagram illustrates the protocol Stack used on a POS interface any time FastEthernet 0/1 5000 ( 28mm ) GT540... Conventions to indicate a new slot to restore proper line-protocol status the L2 port in STP forwarding state therefore.
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line protocol on interface changed state to down 2023