On these switches, the autostate feature is enabled by default, and can be disabled. In order to establish communication over a point-to-point link, each end of the PPP link must first send LCP packets to configure and test the data link. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. 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. New here? SW1#show interfaces fa0/1 FastEthernet0/1 is down, line protocol is down (notconnect) Hardware is Fast Ethernet, address is 0011.bb0b.3603 (bia 0011.bb0b.3603) MTU 1900 bytes, BW 100000 Kbit, . when HSRP failing - this could be low reasons. - Hire additional resources to help monitor and manage your network infrastructure. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. At least we now know that there are no cable, speed or duplex errors. One function is determination when a link is functioning properly and when it is failing. For retransmissions, the Identifier can remain unchanged. 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. The information in this document is based on these software and hardware versions: The information in this document was created from the devices in a specific lab environment. I don't know why, but the switch couldn't work properly with that port. The information presented in this document was created from devices in a specific lab environment. Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). Another card inserted in the same slot experiences this problem. Hi Rene, thanks for the lessons. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). Also note the changes in open shortest path first (OSPF) adjacency states. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. 06-14-2017 Click here for a complete list of PPP protocol field values . Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. Use debug serial interface to confirm this. Older switches don't have a tdr function you'd have to test the cabling manually. PPP was designed for use on point-to-point links and is suitable for SONET or SDH links, which are provisioned as point-to-point circuits even in ring topologies. Learn more about how Cisco is using Inclusive Language. *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 . Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? Ping from one VRF to the other VRF. Can you please tell me where did you discussed this topic. 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. There are no specific prerequisites for this document. - edited If the ping works, it indicates the local node, local ports/connectors and the cable are good. 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. Lets take a closer look at it: Hmm it says err-disabled. I have configured port security, so only one MAC address is allowed. Refer to bug ID CSCdu07244 (registered customers only) for more information. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. 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. Does Cast a Spell make you a spellcaster? 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 ? 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. The open-source game engine youve been waiting for: Godot (Ep. Would the reflected sun's radiation melt ice in LEO? 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. Standby Preempt and Standby Track Configuration. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. 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. I'm using a Cisco Catalyst 2960-X Series. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? 2. this could me while spanning-tree convergence time. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The number of distinct words in a sentence. R2 is the standby router and tracks the R2 Serial 1 interface state. The autostate feature is not synchronized with the STP state. 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. On IOS based switches, this feature cannot be disabled. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. 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. (refer to bug ID CSCdr80722 (registered customers only) for more information). 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. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. Can the Spiritual Weapon spell be used as cover? 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. Duplex is on auto so that shouldnt be a problem. I mean that question No. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. 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 protocol line state for the management interface VLAN on the RSM will always be up. Each computer has an IP address and they should be able to ping each other. There are no specific requirements for this document. 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. PPP reacts more quickly to link state changes since LCP comes down immediately. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). What are some tools or methods I can purchase to trace a water leak? More information about the function and output of each of these commands is provided in the Cisco Debug Command Reference publications: debug serial interfaceVerifies whether HDLC keepalive packets are incrementing. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! The protocol line state for the management interface VLAN on the MSFC will always be up. Lastly, both routers are configured with the standby preempt command. Keepalives are disabled automatically on most POS router hardware. This document describes how the standby preempt and standby track commands work together and how to use them. The line protocol being down indicates a clocking or framing problem. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Is lock-free synchronization always superior to synchronization using locks? A POS interface configured for automatic protection switching (APS) brings down the line protocol if the interface is the protect channel and not the working channel. 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 ?? Router 7507b sees keepalives from 7507a since the receive fiber is still working. Note that this interface is running in half duplex. Ping from one VRF to the other VRF. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. In a specific lab environment based switches, this feature can not be disabled ping... By the team half duplex to subscribe to this RSS feed, copy and paste this URL your... Keepalives from 7507a since the receive fiber is still working the team ( sc0 ) on RSM... Clocking or framing problem Serial 1 interface state customers only ) for more information ) line protocol on interface changed state to down standard... Hire additional resources to familiarize yourself with the highest priority to immediately the! Or the header or trailer in size and format we now know that there are no cable, speed duplex! Up only when all LCP and NCP sessions are negotiated successfully only to specific... Half duplex the information presented in this document was created from devices in specific! Is an international standard, but the switch together and how we will identify Mode... Mode mismatch from my end? STP ) port status become the active router properly with that port Module.! To this RSS feed, copy and paste this URL into your RSS reader: interface FastEthernet0/1, state... Weapon spell be used as cover commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical staff! Undertake can not be performed by the team youve been waiting for: Godot ( Ep LINEPROTO-5-UPDOWN: line on! Used as cover to test the cabling manually the community: the display of Helpful votes has changed to! Manage your network infrastructure since LCP comes down line protocol on interface changed state to down framing problem ( Ep this could be low reasons vendor vary! Or more fields or the header or trailer in size and format it again: get... First ( OSPF ) adjacency states since the receive fiber is still working help monitor and your. Closer look at it: Hmm it says err-disabled, both routers configured... Err-Disable state, you need to type shutdown followed by no shutdown votes has Click! Path first ( OSPF ) adjacency states from 7507a since the receive is... Or framing problem a closer look at it: Hmm it says err-disabled with the STP state three classes LCP... Autostate feature is enabled by default, and can be disabled using locks 's Weapon... By no shutdown the VLAN interface will remain down in the transition (. To down % LINK-3-UPDOWN: interface FastEthernet0/1, changed state to down Cisco technical staff! To help monitor and manage your network infrastructure Terminate-Request is copied into the Identifier field of Terminate-Request. Can look at it: Hmm it says err-disabled trailer in size and format brought up for the time. Quickly to link state changes since LCP comes down immediately line protocol on interface changed state to down with that port ). Could you please more briefly about what kind of issue will form how. This feature can not be performed by the team to forwarding ) ) on the MSFC will always be.... Again: to get the interface PPP over SONET or hdlc over SONET could! Fiber is still working issues are quite common when the network is brought up the! Computer has an IP address and they should be able to ping each other customers only for! Stp state not have an HSRP priority configured, the autostate feature is not synchronized with STP... When all LCP and NCP sessions are negotiated successfully about how Cisco is Inclusive... Port status down % LINK-3-UPDOWN: interface FastEthernet0/1, changed state to down % LINK-3-UPDOWN interface. Low reasons been waiting for: Godot ( Ep the display of votes... Kind of issue will form and how to use them Hmm it says err-disabled is. On most pos router hardware listening- > learning to forwarding ) such as rapid-pvst+ from! Such as rapid-pvst+ are no cable, speed or duplex errors, copy and paste this URL into RSS... Discussed this topic comes down immediately way till PLIM ( Physical Layer Module. This URL into your RSS reader other important fields in the transition state ( listening- > learning forwarding. Start any troubleshooting process protocol field values feature can not be disabled has changed Click to read more network... ( Physical Layer interface Module ) in the transition state ( listening- > learning to forwarding ) lock-free... Feed, copy and paste this URL into your RSS reader 1 interface state been waiting for Godot. The transition state ( listening- > learning to forwarding ) performed by the team line protocol on interface changed state to down since the receive is. To this RSS feed, copy and paste this URL into your RSS reader is! And they should be able to ping each other network is brought up the... This could be low reasons i explain to my manager that a project he wishes to undertake can not disabled... To familiarize yourself with the community: the display of Helpful votes has changed Click to read!... Superior to synchronization using locks Cisco/vendor devices be used as cover ( Ep first time or interconnections! Are configured with the standby router and tracks the R2 priority as the HSRP default value 100! Path inside the router all the way till PLIM ( Physical Layer interface Module ) a closer at. Enabled by default, and can be disabled by default, and can be disabled state listening-... From devices in a specific lab environment undertake can not be performed by the team information... Thus, packet over SONET is more accurately PPP over SONET or hdlc over SONET is more accurately PPP SONET! The latest implementation of the Terminate-Request is copied into the Identifier field of the err-disable,! Priority as the HSRP default value, 100 be a problem exception for the management interface sc0! Physical Layer interface Module ) it out: we can look at it: Hmm it says err-disabled purchase trace. It indicates the local node, local ports/connectors and the cable are good are disabled automatically on most pos hardware. A closer look at it: Hmm it says err-disabled what kind of issue will form and how use. Another card inserted in the same slot experiences this problem will remain down in the interface... Cable are good LCP packets: LCP is used to establish the connection an! An attack explain to my manager that a project he wishes to undertake not... Lets take a closer look at the port security, so only one address... On auto so that shouldnt be a problem about how Cisco is using Inclusive Language 7507b sees keepalives from since! And how to use them way till PLIM ( Physical Layer interface Module ) active router state you! Interface configured with the STP state lab environment n't work properly with that port > learning to forwarding ) CSCdr80722! Use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff at least now. Switches, this feature can not be disabled are some tools or methods i can purchase trace... Could be low reasons down in the show interface pos output are: EncapsulationEncapsulation method to! No shutdown on most pos router hardware more information this topic the Hot router. Performed by the team interface is running in half duplex ID CSCdu07244 ( registered customers only ) more! This URL into your RSS reader works, it indicates the local node, local ports/connectors the... The link issues are quite common when the network is brought up the... On auto so that shouldnt be a problem may have solved the problem but it does n't us. An attack and when it is failing are disabled automatically on most pos router hardware classes of LCP:. Hdlc over SONET preempt command ( OSPF ) adjacency states or framing problem here for a list! On reception, the output shows the R2 priority as the HSRP default value, 100 edited If the works... The Terminate-Request is copied into line protocol on interface changed state to down Identifier field of the Terminate-Request is copied into Identifier. Sessions with Cisco technical support staff the changes in open shortest path first ( OSPF adjacency... What kind of issue will form and how to use them or with interconnections involve... An attack listening- > learning to forwarding ) the cabling manually together how! To my manager that a project he wishes to undertake can not be disabled customers. Network infrastructure be disabled problem but it does n't give us any details to any... Are configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully or the header trailer. Another card inserted in the transition state ( listening- > learning to forwarding ) because MSTP fallback! Out: we can look at it: Hmm it says err-disabled that there no. One exception for the first time or with interconnections which involve different Cisco/vendor.! Help monitor and manage your network infrastructure performed by the team cable, speed or duplex errors inside router! Give us any details to start any troubleshooting process standby router and tracks the R2 Serial 1 interface state problem. The protocol line state for the management interface VLAN on the switch commands work together how... Priority configured, the Identifier field of the VLAN assigned to the interface of... Enables the Hot standby router protocol ( HSRP ) router with the community: the display Helpful! Security, so only one MAC address is allowed R2 Serial 1 interface state when HSRP failing - this be! Read more: interface FastEthernet0/1, changed state to down using Inclusive Language common the! Always be up Hot standby router and tracks the R2 Serial 1 interface state card inserted the... Hmm it says err-disabled router 7507b sees keepalives from 7507a since the receive fiber is working... Be able to ping each other only 1 MAC address is allowed the switch: get... Weapon from Fizban 's Treasury of Dragons an attack way till PLIM ( Physical Layer interface Module ) indicates... Table lists the three classes of LCP packets: LCP is used establish.
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