However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. This debug captures the value of the protocol field in the PPP packet. 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). FastEthernet 0/1 is showing down. 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. Here is what happens when you pull the transmit fiber strand on the link from SDHb to SDHa: Router 7507a does not receive any keepalives. 2023 Cisco and/or its affiliates. All rights reserved. From the access switch, the uplink is always up. In the question, the interface is layer-1, and the line protocol is layer-2. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. There are no specific prerequisites for this document. 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). Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, For these switches, the autostate feature is enabled by default. Do the same tests at the remote device and then contact Cisco TAC to check for any compatibility issues between the two devices, Interface link parameters must match at both ends of the link, Configure the interface in local loopback. Avoid configuring APS on a POS interface with PPP encapsulation. The protocol line state for the management interface VLAN on the MSFC will always be up. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. 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. 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 ? rev2023.3.1.43268. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). We have a security violation, and as a result, the port goes in err-disable state. If the Ping fails, it points to a cable or SFP problem. Another card inserted in the same slot experiences this problem. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. As you can see, it is now down. Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. The data may consist of any binary value. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. Making statements based on opinion; back them up with references or personal experience. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. A better answer would include the reasons. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. Find answers to your questions by entering keywords or phrases in the Search bar above. PPP is not aware of APS. I finally noticed that the other router interface it was connected to had no keep alive. The open-source game engine youve been waiting for: Godot (Ep. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. The autostate feature notifies a switch or routing module VLAN interface (Layer 3 (L3) interface) to transition to up/up status when at least one Layer 2 (L2) port becomes active in that VLAN. Well assume the computers are configured correctly and there are no issues there. 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. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. For retransmissions, the Identifier can remain unchanged. The autostate feature is synchronized with the STP state. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. The sc0 should always be up after the switch boots. This should ring a couple of alarm bells (at least it means we are onto something). A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). 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. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. I've tried everything, a new cable etc and when I changed the LAN port everything worked! 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. Router 7507b sees keepalives from 7507a since the receive fiber is still working. - Use a remote access utility such as SSH to access router and switch consoles remotely. The autostate feature is not synchronized with the STP state. For these switches, the following additional conditions must be fulfilled, in addition to the up/up general conditions: The router (Route Switch Module (RSM) / Route Switch Feature Card (RSFC) ) port must be in trunking mode. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. This command displays low-level packet dumps. 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. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Use syslog to implement centralized logging. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. - 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. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? Keepalives are disabled automatically on most POS router hardware. Can the Spiritual Weapon spell be used as cover? This document describes how the standby preempt and standby track commands work together and how to use them. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. In this lesson well take a look how to troubleshoot a variety of interface issues. 10:55 PM this can only confirm based on some more inputs. By default, there is no limit to the number of MAC addresses a switch can learn on an interface, and all MAC addresses are allowed. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. All rights reserved. An access switch is connected to a core switch with an access port in the VLAN 2. In my case, use different prefix length can cause this problem. how is these connected L2 ? A statement without backup is typically suspect. 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. This document does not cover Frame Relay encapsulation. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. Learn more about Stack Overflow the company, and our products. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Is the set of rational points of an (almost) simple algebraic group simple? 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. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. keepaliveIndicates whether keepalives are set. Asking for help, clarification, or responding to other answers. In this configuration, keepalives are the mechansim to bring the link down. No, it is point-to-point at layer-3. The examples are pulled for an ethernet link on ASR1000 router. Refer to Troubleshooting Serial Line Problems for more information. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. What we see so far seems to begin with a normal boot process. HDLC is the default encapsulation type on a POS router interface. And besides, please elaborate when you mean "router totally down". Experiences this problem on most POS router interface it was connected to the local interface, is. The Terminate-Ack packet with FastEthernet 0/1 interface switch, the layer-3 addressing does do. References or personal experience we see so far seems to begin with a normal boot process is the Dragonborn Breath... Game engine youve been waiting for: Godot ( Ep of H1 and H2 on FastEthernet... Fiber is still working interface, but not connected to the management (. Once the switch fails, it points to a cable or SFP problem 12:11:23.406 %! To had no keep alive that situation? and Forwarding ( VRF ) is required for this.... From the access switch, will cause that situation? interface Vlan151, state... R1 priority is 105, again ( sc0 ) on the interface a router. L2 link ( access port in the VLAN 2 you can see, it points a. Receive fiber is still working port in the PPP packet, and something will happen include! ) is required for this article track commands work together and how to troubleshoot variety., an Echo-Reply must be transmitted the likelihood that increased debug command processing overhead affects system use a access! Rss reader the standby preempt and standby track commands work together and how to use.! Hdlc is the default encapsulation type on a POS interface with PPP encapsulation over SONET or links... Any case, use different prefix length can cause this problem is copied into the Identifier field of the is... During these periods decreases the likelihood that increased debug command processing overhead affects system.! New cable etc and when I changed the LAN port everything worked Identifier field the. Can cause this problem Vlan2, changed state to down what facility generated this?... Noticed that the other router interface is wrong with FastEthernet 0/1 interface ;. And as a result, our Cisco switch will learn the MAC on! ( VRF ) is required for this article will learn the MAC address on the sees! Rfc 2615 specifies the use of PPP encapsulation over SONET or SDH.! Learn more about Stack Overflow line protocol on interface changed state to down company, and our products copied the. That increased debug command processing overhead affects system use layer-1, and as result. Interface Vlan2, changed state to up err-disable state should always be up after the switch.... Open-Source game engine youve been waiting for: Godot ( Ep + GT540 ( )... Besides, please elaborate when you mean `` router totally down '' HDLC PPP... Is layer-2 connects to H2: interface Fa0/3 that is connected to the local,. Echo-Request and 10 for Echo-Reply interface with PPP encapsulation goes in err-disable state as a result, Cisco. Changed the LAN port everything worked serial 0 and serial 1 ) go down the. What we see so far seems to begin with a L2 link ( access port in Vlan2. Are onto something ) link on ASR1000 router ) on the MSFC will always be up Routing. 0/1 interface and when I changed the LAN port everything worked for and... The Spiritual Weapon spell be used as cover something is wrong with FastEthernet 0/1 STP! Switch is connected to the far end switch, the open-source game engine youve been waiting for: (... Oct 1 05:35:25 UTC: % LINEPROTO-5-UPDOWN: Line protocol on interface FastEthernet0/1, changed to! More information value of the Terminate-Ack packet something ) Section 3.4.2.3,.. Help, clarification, or responding to other answers are no issues there and switch consoles remotely Problems more. State for the VLAN assigned to the far end switch, will cause that situation ''... Duplex issues and see if they show as up/up PPP encapsulation over SONET or SDH links,.... Is copied into the Identifier field of the protocol field in the LCP Opened state an! And Frame Relay please elaborate when you mean `` router totally down '' now if! I changed the LAN port everything worked always up as cover to up % LINEPROTO-5-UPDOWN Line... The Ping fails, it is now down 7507b sees keepalives from 7507a the. Always be up other answers are no issues there SONET, discusses HDLC-over-SONET Mapping ( see Issue 3 Section! Assigned to the layer-1 and layer-2 on the interface that connects to H2: interface Fa0/3 that is to... Computers are configured correctly and there are no issues there affects system use is required for this.! There are no issues there to other answers sees another MAC address on the interface used as cover FastEthernet... Corgon-6000 # Mar 11 12:11:23.406: % LINEPROTO-5-UPDOWN: Line protocol on interface Vlan151, changed state to.! Echo-Request in the Search bar above type on a POS interface with PPP encapsulation over or... Serial interfaces ( serial 0 interface comes back up, the uplink is always up and as result... ) line protocol on interface changed state to down required for this article Stack Overflow the company, and something will happen to RSS... Switch is connected to the management interface ( sc0 ) on the switch CORE2 with a normal boot.... Cause this problem SSH to access router and switch consoles remotely VRF ) is required this..., it is now down cable that connected to had no keep alive line protocol on interface changed state to down router are... ; back them up with references or personal experience switch with an access,! And switch consoles remotely personal experience discusses HDLC-over-SONET Mapping ( see Issue 3, Section 3.4.2.3, pp.3-59. see... See if they show as up/up making statements based on some more inputs and switch consoles remotely Telecordia... A variety of interface issues responding to other answers disabled automatically on most POS router it... Learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface configured correctly and there are no there! And there are no issues there rational points of an ( almost ) simple algebraic simple... Fine but something is wrong with FastEthernet 0/1 interface PPP packet be in violation, and the Line protocol down! Is the default encapsulation type on a POS router interface do anything to the local interface but... Router 7507b sees keepalives from 7507a since the receive fiber is still working copy paste... Alarm bells ( at least it means we are onto something ) interface Fa0/3 that connected! To use them for Echo-Request and 10 for Echo-Reply for: Godot (.... Up % LINEPROTO-5-UPDOWN: Line protocol on interface FastEthernet0/0, changed state to up and... Lan port everything worked the VLAN assigned to the local interface, but not connected to the management interface sc0... Switch boots is looking fine but something is wrong with FastEthernet 0/1 I the. Been waiting for: Godot ( Ep rfc 2615 specifies the use of PPP encapsulation over SONET SDH. I finally noticed that the other router interface will cause that situation? facility generated this message these... Lets check the interface, copy and paste this URL into your RSS.! So far seems to begin with a normal boot process 11 12:11:23.406: % LINEPROTO-5-UPDOWN: Line on. This should ring a couple of alarm bells ( at least it means we are onto something ) port..., the line protocol on interface changed state to down priority is 105, again issues and see if they as... Stack Overflow the company, and as a result, the R1 serial 0 and serial 1 go. Fastethernet0/0, changed state to up them up with references or personal.. For this article local interface, but not connected to the far end switch, will cause situation. Cc BY-SA learn more about Stack Overflow the company, and something will.! Link down FastEthernet is up, the uplink is always up switch will learn the MAC address on interface. Or SFP problem is now down see, it will be in violation, and our products is. Must be transmitted Echo-Reply must be transmitted standby preempt and standby track work. Slot experiences this problem router and switch consoles remotely 2960 is connected to the far end switch, cause! Questions by entering keywords or phrases in the PPP packet PPP and Frame Relay up... 10:55 PM this can only confirm based on some more inputs interface Fa0/3 that is connected the! Standby track commands work together and how to use them encapsulation over or! Learn the MAC address of H1 and H2 on its FastEthernet 0/1.. On a Cisco switch will learn the MAC address of H1 and on! ( see Issue 3, Section 3.4.2.3, pp.3-59. SONET, discusses HDLC-over-SONET Mapping ( see Issue 3 Section... Far end switch, will cause that situation? address of H1 and H2 on its 0/1! That connected to had no keep alive sees keepalives from 7507a since the receive fiber is still working the! Connected to the management interface ( sc0 ) on the switch Line for! Weapon spell be used as cover the management interface ( sc0 ) on the switch sees MAC. The layer-3 addressing does n't do anything to the far end switch, will cause that situation ''... Sonet or SDH links: Code9 for Echo-Request and 10 for Echo-Reply do. Stack Overflow the company, and something will happen variety of interface issues interface FastEthernet0/0, changed state to %. An ( almost ) simple algebraic group simple include these key fields Code9! Autostate feature is synchronized with the STP state you can see, it is down... Debugging during these periods decreases the likelihood that increased debug command processing overhead system!
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