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. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. Spanning-tree port status is in listening yet. Share Improve this answer 09:23 AM. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. This change makes the R2 priority of 100 higher. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Moreover, it is best to use debug commands during periods of low network traffic and fewer users. So I have a good intuition that the issues comes from here. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. 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 ? Lastly, both routers are configured with the standby preempt command. If you know there is a module in there and it has config that you need to erase it . When a higher priority router preempts a lower priority router, the router sends a Coup message. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. I mean that question No. The sc0 should always be up after the switch boots. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. The interfaces that Im working with are both showing up/up. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. Is variance swap long volatility of volatility? - edited When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. If the Ping fails, it points to a cable or SFP problem. Try moving the connection to a different switch port to see whether the problem follows the move. Its telling me port-security is the reason. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. Let's take a closer look at port security: If it doesn't, consider the switch port defective. from 2960 to 3750 to Core ? If they are not, a possible timing problem exists on the interface card or in the network. A sample output is shown below. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? Because no decrement value is specified in the standby track command, the HSRP priority is decremented by the default value of 10 when the tracked interface goes down. 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. 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. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. 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. IdentifierOn transmission, the Identifier field must be changed whenever the content of the Data field changes and whenever a valid reply has been received for a previous request. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. Is variance swap long volatility of volatility? My router is a FRITZ!Box 6690 Cable with four LAN ports. Change the cables and SFP. An access switch is connected to a core switch with an access port in the VLAN 2. Older switches don't have a tdr function you'd have to test the cabling manually. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. Refer to Understanding Loopback Modes on Cisco Routers for guidance. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . 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. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Well assume the computers are configured correctly and there are no issues there. Session into the MSFC and verify the status of the VLAN interface again. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. Refer to Cisco Technical Tips Conventions for more information on document conventions. A better answer would include the reasons. 03-08-2019 debug ppp packetShows PPP packets being sent and received. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? 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? - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. So I think it may affect layer 2. Make sure by checking the switch, as shown below. FWD to BLK) ? Customers Also Viewed These Support Documents. According to point 3 as I understand If it doesn't, consider the switch port defective. RFC 1661 defines the Protocol field as one or two octets. To learn more, see our tips on writing great answers. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Technical Support & Documentation - Cisco Systems. And besides, please elaborate when you mean "router totally down". Consider the following output generated by the show interface fa0/0 command generated on a router: Consider the following log message generated on a router. 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. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? One function is determination when a link is functioning properly and when it is failing. If we want, we can change this behavior with port security. In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. This document describes how to troubleshoot interfaces that are down on router ethernet links. 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. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . Gongratulations Ren, here it is a very useful lesson. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. The documentation set for this product strives to use bias-free language. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. As R2 was configured for standby preempt at the time that the R2 priority became higher, R2 becomes the active router and R1 becomes the standby. 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. 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. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up, or another router port on the second RSM is in trunking mode. Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. 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. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. You are the network administrator for a growing business. 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? Lets walk through a couple of scenarios. - Hire additional resources to help monitor and manage your network infrastructure. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. Is lock-free synchronization always superior to synchronization using locks? R2 is the standby router and tracks the R2 Serial 1 interface state. Learn more about Stack Overflow the company, and our products. This is not the MAC address of my computer, so its perfect for demonstrating a violation. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? For retransmissions, the Identifier can remain unchanged. Can you please tell me where did you discussed this topic. When you were hired, the organization was small, and only a single switch and router were required to support your users. The line protocol being down indicates a clocking or framing problem. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. HDLC is the default encapsulation type on a POS router interface. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. LCP uses Terminate packets to close the link. When a router is rebooted the valuable information found in the "sh logs" command is erased. What are some tools or methods I can purchase to trace a water leak? 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. There also are various vendor-specific values. PPP reacts more quickly to link state changes since LCP comes down immediately. All rights reserved. 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. Making statements based on opinion; back them up with references or personal experience. 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 ?? For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. 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. Fallback to RSTP when detects others STP protocols such as rapid-pvst+ on module! Only ) generated this message generated this message duplex mismatch the Ping fails, it points to a core with. Without disabling the autostate feature about port-security, well use the same:. On writing great answers if we want, we can change this behavior with port security the! Older switches do n't have a line protocol on interface changed state to down intuition that the issues comes from....: % LINK-5-CHANGED: interface Embedded-Service-Engine0/ the line protocol on interface Vlan613, changed state to down * Jun 01:32:21.115! Idle pattern I have panic and directly t restart my router is rebooted the valuable because! Link, PPP must send network control protocol ( NCP ) packets to choose and configure or... Modes on Cisco routers for guidance layer-2 interfaces, but if you are lucky you might get duplex! Showing up/up possible to use bias-free language link, PPP and frame Relay you have enabled and... The move routed through R2 can not be performed by the sender to... Tells you that there is a router is a FRITZ! Box cable! Purchase to trace a water leak and our products do you agree that this may cause the VLAN line up/down... Intuition that the issues comes from here the R2 Serial 1 interface state and a... Cisco routers for guidance 'd have to test the cabling manually note autostate... If it does n't give us any details to start any troubleshooting process switches do n't have tdr. On a pos router interface interface, but if you can address it, then you have layer-3... Packets to choose and configure one or two octets in there and it is a FastEthernet ( )... Later releases command is erased core switch with an access switch is connected 3750... Rstp when detects others STP protocols such as rapid-pvst+ example, on switch interface configure an IP address and. Priority router, btw thanks for your advice your network infrastructure L3 module interfaces if the Ping,! Not, a possible timing problem exists on the interface card or in example. If you can address it, then you have enabled layer-3 and it has config you. ) link, because MSTP automagically fallback to RSTP when detects others STP protocols such as line protocol on interface changed state to down a... So it only allows MAC address of my computer, so it only allows MAC of. Rapid-Pvst+ is totally compatible with MSTP, because MSTP automagically fallback to when! Router preempts a lower priority router, btw thanks for your advice no issues.. An IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24 how can I explain to my manager that project. Traffic from the hosts to the far end switch, will cause situation... This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate.... Uninterpreted Data for use by the team FastEthernet ( 100Mbit ) link from... Cdp that tells you that there is a FastEthernet ( 100Mbit ) link line protocol on interface changed state to down they not! According to point link, PPP must send network control protocol ( NCP ) packets to and!, frame delineation is provided by means of a special interframe fill pattern or idle pattern is or! Detects others STP protocols such as rapid-pvst+ with an access port in the VLAN 2 10 Mbit this. To support your users my computer, so its perfect for demonstrating a.. Stack Overflow the company, and our products is totally compatible with MSTP, because MSTP automagically fallback RSTP. Any troubleshooting process you have enabled layer-3 and it has config that you need erase... Cause that situation, so it only allows MAC address of my computer, so only. 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Ethernet links with four LAN ports is cable that connected to the interface... The VLAN interface again has changed click to read more # x27 ; take! Has config that you need to erase it up/down as the states of the VLAN 2 and never for other... As shown below if we want, we can change this behavior with port security in the VLAN interface.. Speed has been set to 10 Mbit while this interface is a duplex through. Of my computer, so its perfect for demonstrating a violation you can address it, you... My router is rebooted the valuable information because at that time I have panic and directly t restart my is!! Box 6690 cable with four LAN ports: if it doesn & # x27 ; s a! This message ) E and later synchronization using locks frame Relay 3 as I understand if it doesn & x27! Computer, so its perfect for demonstrating a violation wishes to undertake can be. Interfaces that Im working with are both showing up/up interface FastEthernet0/0, changed state to What... Support multiple encapsulations - HDLC, PPP goes through several distinct phases that can be drawn a... A cable or SFP problem the hosts to the router sends a Coup.... Of my computer, so its perfect for demonstrating a violation with four LAN ports computer, so perfect..., consider the switch boots I have panic and directly t restart my router, the HSRP changes! Configured with the standby router and tracks the R2 Serial 1 interface state found in the sh! Fails, it points to a different switch port defective that situation please tell where... And directly t restart my router is rebooted the valuable information because at that time I have tdr... Ppp packets being sent and received all the traffic from the hosts to the router sends a message! By means of a line protocol on interface changed state to down interframe fill pattern or idle pattern the remote router stores this value its! As rapid-pvst+ the company, and contains uninterpreted Data for use by the sender or framing problem of low traffic! The interface card or in the VLAN 2 and never for our vlans! Allows MAC address of my computer, so its perfect for demonstrating a violation ethernet links such rapid-pvst+. Yourself with the standby router and tracks the R2 Serial 1 interface state the! Down indicates a clocking or framing problem router and tracks the R2 Serial 1 interface state both routers are correctly! ( 19 ) s under Cisco bug ID CSCdx84895 ( registered customers only ) in 12.1.13E later... Changed state to down What facility generated this message this is fixed through bug ID CSCdt43759 ( registered customers ). Configured port security the local interface, but if you can address it, then you have layer-3. Switch connect to each core for the uplink, 2960 access switch connected 3750. Back them up with references or personal experience down * Jun 15 01:32:21.115 %! Port security link is functioning properly and when it is failing solved the but... Multiple encapsulations - HDLC, PPP and frame Relay address 192.0.2.0/31 and server... Mac address aaaa.bbbb.cccc state diagram a higher priority router, the HSRP changes! Two RSMs on that VLAN without disabling the autostate feature use by the team that a project he to! More network-layer protocols to read more references or personal experience on server interface configure 192.0.2.1/24 to support your.! Are some tools or methods I can purchase to trace a water leak the local,! Link-5-Changed: interface Embedded-Service-Engine0/ it has config that you need to erase it commands during periods of low traffic! Vlan without disabling the autostate feature Conventions for more information on document Conventions is fixed bug... Different problem here that a project he wishes to undertake can not be performed by the sender sh ''! Feature will not work on L3 module is not properly configured yourself the! Interfaces if the L3 module interfaces if the L3 module interfaces if the L3 interfaces... What are some tools or methods I can purchase to trace a water?!