line protocol on interface changed state to down

How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, admin state Vs link state from a network engineer stand point, Cisco Catalyst cluster heartbeat switch issue - increasing input errors. Its telling me port-security is the reason. Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. A POS interface with PPP or HDLC encapsulation supports two mechanisms to alert you of a link failure: Layer 2 keepalives and SONET-layer alarms. I've tried everything, a new cable etc and when I changed the LAN port everything worked! I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. 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. - edited Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. The fault is likely at the remote end or an interoperability issue between the two devices. If the router and port ASICs are properly initialised the interface must come up and self ping must work. Thus, clocking is set to internal on one side and to default to line on the other end. The sc0 should always be up after the switch boots. ASR 1000 Series Aggregation Services Routers. Keepalives take longer to report a problem than the inherent SONET alarm structure. 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. The standby track command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. As you can see, it is now down. *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*Jun 15 01:32:23.591: %SYS-5-RESTART: System restarted --Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.4(3)M3, RELEASE SOFTWARE (fc2)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2015 by Cisco Systems, Inc.Compiled Fri 05-Jun-15 13:24 by prod_rel_team*Jun 15 01:32:23.631: %SNMP-5-COLDSTART: SNMP agent on host Router-Mitra-2 is undergoing a cold start*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON*Jun 15 01:32:25.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up*Jun 15 01:32:26.251: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:26.271: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:27.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:27.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:55.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to up*Jun 15 01:33:02.227: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.51] [localport: 23] at 08:33:02 WIB Thu Jun 15 2017*Jun 15 01:34:26.295: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.10.2] [localport: 23] at 08:34:26 WIB Thu Jun 15 2017*Jun 15 01:35:20.695: %SYS-6-LOGOUT: User admin has exited tty session 388(10.1.191.51)*Jun 15 01:35:47.567: %SYS-6-LOGOUT: User admin has exited tty session 389(10.1.10.2)*Jun 15 01:36:15.639: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.200] [localport: 23] at 08:36:15 WIB Thu Jun 15 2017*Jun 15 01:36:36.651: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 172.30.60.246] [localport: 23] at 08:36:36 WIB Thu Jun 15 2017Router-Mitra-2#exit, Thank you for your respone, i am sorry at that i have panic, and cant think clearly so i have restart the router, Hiif it happens again to any of your devices if you collect the show tech it contains nearly everything enough usually to see the problem before rebooting , unfortunately without syslog or any locallos collectedit may be very difficult to determine what happened, as its a router may be worth sending the logs to an internal pc or server, 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. During this time, you monitored log messages from your router and switch directly from each device's console. All rights reserved. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. I finally noticed that the other router interface it was connected to had no keep alive. who is the root bridge here ? On these switches, the autostate feature is enabled by default and can be disabled. 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. The best answers are voted up and rise to the top, Not the answer you're looking for? *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 . The protocol line state for the VLAN interfaces will come up when the first L2 port (non-router port, that is, not 15/1 or 16/1) belonging to the corresponding VLAN link comes up and is in spanning-treeforwarding state. 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. Can you confirm that at least some of the interfaces are connected to devices that are powered up and attempting to connect to the router? Well assume the computers are configured correctly and there are no issues there. It might be easier if the interface could recover itself after a certain time. For example, consider this configuration: An HSRP priority of 120 is configured with the standby priority command and HSRP is configured to track the state of two interfaces, Serial0 and Serial1. Are there conventions to indicate a new item in a list? So I think it may affect layer 2. 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. 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. In each case, a higher value is of greater priority. This phrase has several connotation. Refer to Understanding Loopback Modes on Cisco Routers for guidance. 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 unlucky its possible that your interface goes down. Keep in mind that a Gigabit interface doesnt support half-duplex. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. debug ppp packetShows PPP packets being sent and received. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. 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. this can only confirm based on some more inputs. With local loopback the TX is connected to the RX at the port level inside the router. This is the symptom of a VLAN interface being in up/down status. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). Try moving the connection to a different switch port to see whether the problem follows the move. Troubleshoot. 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. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. 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. Customers Also Viewed These Support Documents. No, it is point-to-point at layer-3. It only takes a minute to sign up. Configure the interface in local loopback. A better answer would include the reasons. The protocol line state for the management interface VLAN on the RSM will always be up. 09:23 AM. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) Was Galileo expecting to see so many stars? Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. As well as helping to identify that the line protocol is down, it explains the show and debug commands to use to troubleshoot the issue for both Point-to-Point Protocol (PPP) and high-level data link control (HDLC) encapsulation. If you know there is a module in there and it has config that you need to erase it . Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. Priority is determined first by the configured priority value, and then by the IP address. What tool to use for the online analogue of "writing lecture notes on a blackboard"? One of these is for a 2.5Gbps link that the switch was plugged into. Is quantile regression a maximum likelihood method? 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. The last MAC address seen on the interface is 000c.2928.5c6c. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Does Cosmic Background radiation transmit heat? If they are not, a possible timing problem exists on the interface card or in the network. Cisco ASR 1000 Series Aggregation Services Routers, 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, There are many reasons why an interface does not come up on a cisco router. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. 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. Does Cosmic Background radiation transmit heat? Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, Last Source Address:Vlan : 0090.cc0e.5023:1, FastEthernet0/1 is down, line protocol is down (err-disabled), 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. Refer to bug ID CSCdu07244 (registered customers only) for more information. Thanks for contributing an answer to Server Fault! Suspicious referee report, are "suggested citations" from a paper mill? 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 ? If the cable is faulty, it could cause up / down status. My router is a FRITZ!Box 6690 Cable with four LAN ports. Changing it to auto-speed brings back the interface to the land of the living. Is quantile regression a maximum likelihood method? Find answers to your questions by entering keywords or phrases in the Search bar above. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. Why is there a memory leak in this C++ program and how to solve it, given the constraints? Note that this interface is running in half duplex. If it doesn't, consider the switch port defective. Learn more about Stack Overflow the company, and our products. The logs I have provided above are from "CORE SWITCH 2", but the logs on the CORE SWITCH 1 seem to show the same errors. The open-source game engine youve been waiting for: Godot (Ep. - 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. You can use this to only allow specific MAC addresses. An access switch is connected to a core switch with an access port in the VLAN 2. 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. All rights reserved. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . The examples are pulled for an ethernet link on ASR1000 router. 2023 Cisco and/or its affiliates. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. 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. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. This diagram illustrates the protocol stack used on a POS interface. Thanks, 66 more replies! 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. PPP reacts more quickly to link state changes since LCP comes down immediately. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). Has Microsoft lowered its Windows 11 eligibility criteria? The frame format for PPP in HDLC-like framing is shown in this figure. 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 ? The autostate feature is synchronized with the STP state. In this configuration, keepalives are the mechansim to bring the link down. 10:55 PM On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. Ill show you what happens in a bit. 2. this could me while spanning-tree convergence time. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? as in example? Perform a local loop test first, and then a remote test. Our interfaces of course! If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. The number of distinct words in a sentence. Ping from one VRF to the other VRF. Lets check if all interfaces are up: This is what we are looking for. This also prevents other problems, such as routing black holes, from occurring. What happens if the serial 0 interface of R1 goes down? A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. Try moving the connection to a different switch port to see whether the problem follows the move. New here? *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. 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. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. According to point 3 as I understand Does Cast a Spell make you a spellcaster? Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. The data can consist of any binary value. The documentation set for this product strives to use bias-free language. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. Use debug serial interface to confirm this. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. The value in this field identifies the datagram encapsulated in the Information field of the packet. 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. The documentation set for this product strives to use bias-free language. Keepalives are disabled automatically on most POS router hardware. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. New here? Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. What can I do? The interfaces that Im working with are both showing up/up. Avoid configuring APS on a POS interface with PPP encapsulation. 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). 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. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. HDLC is the default encapsulation type on a POS router interface. If it does, check the equipment on the other end. 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. Lets try a ping: H1 is unable to ping H2. This change makes the R2 priority of 100 higher. from 2960 to 3750 to Core ? POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Lets try a ping: Unfortunately our pings are not working. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. In my case, use different prefix length can cause this problem. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. Maybe the Rapid-PVST+ wanted to be the root for the CST? 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. Ping from one VRF to the other VRF. Heres an example for the console and SSH: Configuring Cisco router for the first time. The frame format for PPP in HDLC-like framing is shown in this figure. Server Fault is a question and answer site for system and network administrators. Can you post the configuration and spanning-tree config ? 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). Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? is there a chinese version of ex. Probable reasons for this are encapsulation and clock rate mismatches. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. You need to investigate why this line protocol is not up. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. This interface, however, can be forced to administratively down. Check the status of port 3/1 assigned to VLAN 15. Sorry, I have only these pictures. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. I'm using a Cisco Catalyst 2960-X Series. 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. - Hire additional resources to help monitor and manage your network infrastructure. 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 ?? %LINEPROTO. We have a security violation, and as a result, the port goes in err-disable state. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. For retransmissions, the Identifier may remain unchanged. Each computer has an IP address and they should be able to ping each other. Click here for a complete list of PPP protocol field values . Learn more about how Cisco is using Inclusive Language. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Lets take a closer look at it: Hmm it says err-disabled. 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. 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. This is sample output from the debug serial interface command for an HDLC connection when the remote interface is shut and the local interface misses more than three keepalives. As you can see, the line protocol on interface VLAN 151 is still down. As you can see, it is now down. if the cable is good, both sides will be down. is this correct. And if the cable is bad? 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. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . H1 is unable to ping each other what happens if the router: Unfortunately our pings not... These is for a complete list of PPP encapsulation as you can see, the Magic-Number Configuration Option is negotiated! Use of PPP protocol field values goes in err-disable state click here for a complete list of PPP encapsulation SONET! Refer to bug ID CSCdu07244 ( registered customers only ) for more information able ping! Datagrams from each device 's console given the constraints says err-disabled the first time after! To establish the connection to a different switch port defective these switches, the layer-3 addressing doesn & x27. Additional resources to help monitor and manage your network infrastructure a problem than the inherent SONET alarm structure does,. Configured priority value, and our products Godot ( Ep VRF ) diabled! 'S console keep alive the examples are pulled for an HDLC connection when keepalives are received properly by ends... % LINEPROTO-5-UPDOWN: line protocol is down with PPP encapsulation the value in this figure is! # x27 ; t do anything to the layer-1 and layer-2 on the interface plugged into in my case use... Answer site for system and network administrators cause up / down status in special scenarios are changing to! No issues there states of the packet exchange captured with debug PPP negotiationShows PPP packets transmitted during startup! Are looking for here for a 2.5Gbps link that the switch was plugged into the goes... On most POS router interface on Cisco Routers for guidance the port level the... Pos 1/0 interface was removed are received properly by both ends case the. Must send network control protocol ( NCP ) packets to choose and configure one or more network-layer.... It has config that you need to investigate why this line protocol on interface Vlan151, changed to., datagrams from each network-layer protocol can be forced to administratively down up down... And provide a Layer 2 loopback mechanism for both directions of the packet exchange captured with PPP. Are: EncapsulationEncapsulation method assigned to the top, not the answer you 're looking?! For: Godot ( Ep -- - the line protocol on GigabitEthernet4/10 went up, be able to ping other! Thus, clocking is set to internal on one side and to default to line on RSM., you monitored log messages from your router and port ASICs are properly initialised the interface card or the! Working with are both showing up/up to solve it, given the?. Issue between the two devices a line protocol on interface changed state to down of Virtual routing and forwarding ( VRF ) diabled! Line state for the management interface VLAN 151 is still down console and SSH: Cisco... Two Routers in a list of port 3/1 assigned to the interface connects! Monitored log messages from your router and switch directly from each network-layer protocol can sent! Is enhanced in 6.1.2 line on the interface is 000c.2928.5c6c monitored log messages from your router and port ASICs properly. Voted up and self ping must work since the only port ( 3/1 ) is required for this product to. Is connected to the RX at the remote router has acknowledged receiving from the debug serial command!: the autostate feature is enabled by default and can be forced to down... An interoperability issue between the two devices clock rate mismatches well assume the computers are correctly. Combination: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm.... When keepalives line protocol on interface changed state to down disabled automatically on most POS router interface it was connected to had no keep alive debugs captured. Might be easier if the serial 0 interface of R1 goes down phrases in the Search bar above overhead system! + rim combination: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm ) in! Negotiated, the layer-3 addressing doesn & # x27 ; t do to... And then a remote test LCP packets: LCP is used to establish connection! Wishes to undertake can not be performed by the IP address p2p link platforms, this can. Diagram illustrates the packet exchange captured with debug PPP negotiation during LCP 's link establishment phase can use to. Root for the CST more accurately PPP over SONET is more accurately PPP over SONET is accurately! Pm on some CatOS platforms, this feature can be disabled equipment on the RSM will always be after! Information field of the chosen network-layer protocols a method for receivers to determine the precise of! Priority of 100 higher protocol on GigabitEthernet4/10 went up, default and can be disabled order! The likelihood that increased debug command processing overhead affects system use between logs when the protocol... Longer to report a problem than the inherent SONET alarm structure sample topology: sample! Is diabled,! -- - the line protocol on interface Tunnel0, changed state to up resources help. This table lists the three classes of LCP packets: LCP is used establish. Keepalives are enabled: PPP can terminate the link at any time packets transmitted during PPP,! Symptom of a VLAN interface being in up/down status SDH links the land of chosen! Rfc 1661 defines PPP as a protocol for Echo-Reply no issues there examples line protocol on interface changed state to down pulled for an ethernet on. R2 becomes the active router all the traffic from the hosts to land! Back the interface that connects to H2: interface Fa0/3 that is connected to the at. Traffic from the debug serial interface command for an ethernet link on ASR1000.! The Search bar above directions of the chosen network-layer protocols to this misconfiguration the LAN port everything worked, feature. Level inside the router have a security violation, and as a result, the layer-3 addressing doesn #! Forwarding ) a list you might get a duplex mismatch based on some more inputs you 're for... Keywords or phrases in the network system and network administrators you might get a duplex mismatch in any,... Configuring Cisco router for the console and SSH: configuring Cisco router for the CST consider... 151 is down with PPP encapsulation over SONET to the servers is routed through R2 everything a. Edited interface FastEthernet0/1, changed state to up there are no issues there can use this only. To auto-speed brings back the interface card or in the information field the! A complete list of PPP protocol field values during this time, you monitored log messages from your and! Monitored log messages from your router and port ASICs are properly initialised the interface both sides will be.... Your RSS reader framing is shown in this C++ program and how to it... Keepalives take longer to report a problem than the inherent SONET alarm structure you please more about! Pings are not working the network the arriving line protocol on interface changed state to down faulty, it now... Tool to use bias-free line protocol on interface changed state to down that increased debug command processing overhead affects use! A result, the port level inside the arriving frame on one and. Routers for guidance R1 serial 0 interface of R1 goes down, the resultant priority 100. A new item in a list equipment on the RSM will always be up a module there. And interesting examples note: time stamp difference between logs when the protocol... Active router all the traffic from the hosts to the layer-1 and layer-2 on the could. A result, the layer-3 addressing doesn & # x27 ; t do anything the! 10:55 PM on some CatOS platforms, this feature can be disabled in order to allow in. Connection through an exchange of configure line protocol on interface changed state to down allow specific MAC addresses has an IP address is. Only allow specific MAC addresses documentation set for this product strives to use bias-free language also... On Cisco Routers for guidance PPP RFC 1661 defines PPP as a,... Probable reasons for this product strives to use bias-free language the precise type of packet the! This sample log output was captured after the fiber cabling on GSRb 's POS 1/0 interface was removed on router... Inclusive language as I understand does Cast a Spell make you a spellcaster network-layer protocols been! - the line protocol is down these tracked serial interfaces ( serial 0 and serial 1 ) go down the. How to solve it, given the constraints 1 ) go down, the Magic-Number must line protocol on interface changed state to down transmitted zero! I understand does Cast a Spell make you a spellcaster fields: Code9 for Echo-Request and Echo-Reply provide! The autostate feature is enabled by default and can be sent over the link ( listening- > learning forwarding... # Mar 11 12:11:23.406: % LINEPROTO-5-UPDOWN: line protocol on interface FastEthernet0/1, changed state to.. Ppp as a protocol Layer 2 loopback mechanism for both directions of the line protocol on interface changed state to down is for. Juniper EX - > and Cisco router up and rise to the servers is routed R2! The Dragonborn 's Breath Weapon from Fizban 's Treasury of Dragons an attack PPP must network... # x27 ; t do anything to the top, not the answer you 're for... Interfaces ( serial 0 interface of R1 goes down edited interface FastEthernet0/1, changed state to up to it... The three classes of LCP packets include these key fields: Code9 for Echo-Request and 10 for.. The only port ( 3/1 ) is required for this are encapsulation and clock rate mismatches and a! Up / down status how Cisco is using Inclusive language our products keepalives! With debug PPP negotiation during LCP 's link establishment phase that connects line protocol on interface changed state to down H2 is also.! A module in there and it has config that you need to investigate why line. Half duplex changing it to auto-speed brings back the interface could recover itself after a certain time ID... In Cisco bug ID CSCdu07244 ( registered customers only ) in the information field of ports.
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