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Link Flap

arakeshr
Beginner
Beginner

Hi Team,

We are experiencing Link down issue, lease anyone help to why link went down.

Below are the logs...

2023 Feb 27 16:18:53 QROMSPCNXL3B201 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/51 is down (Link failure)
2023 Feb 27 16:18:53 QROMSPCNXL3B201 %BGP-5-ADJCHANGE: bgp- [594] (PSTN) neighbor 10.27.4.33 Down - sent: bfd session down
2023 Feb 27 16:18:53 QROMSPCNXL3B201 %BFD-5-SESSION_STATE_DOWN: BFD session 1090519042 to neighbor 10.27.4.33 on interface Eth1/51 has gone down. Reason: Path Down.

 

Thanks

Rakesh

 

3 Replies 3

MHM Cisco World
VIP Mentor VIP Mentor
VIP Mentor

Link failure

but sorry the link is failed and that why it down, that what appear in log 

Hi ,Thanks for input

My Core Switch(two links are connected to ASR Router ) they asking why it is went down...what are the possible reasons to link down.please help on this

2023 Feb 25 16:18:53 QROMSPCNXL3B201 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/51 is down (Link failure)
2023 Feb 25 16:18:53 QROMSPCNXL3B201 %BGP-5-ADJCHANGE: bgp- [594] (PSTN) neighbor 10.27.4.33 Down - sent: bfd session down
2023 Feb 25 16:18:53 QROMSPCNXL3B201 %BFD-5-SESSION_STATE_DOWN: BFD session 1090519042 to neighbor 10.27.4.33 on interface Eth1/51 has gone down. Reason: Path Down.
2023 Feb 25 16:18:53 QROMSPCNXL3B201 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/49 is down (Link failure)
2023 Feb 25 16:18:53 QROMSPCNXL3B201 %BGP-5-ADJCHANGE: bgp- [594] (TELCEL) neighbor 10.27.4.1 Down - sent: bfd session down
2023 Feb 25 16:18:53 QROMSPCNXL3B201 %BFD-5-SESSION_STATE_DOWN: BFD session 1090519057 to neighbor 10.27.4.1 on interface Eth1/49 has gone down. Reason: Path Down.
2023 Feb 25 16:18:54 QROMSPCNXL3B201 %BFD-5-SESSION_REMOVED: BFD session to neighbor 10.27.4.33 on interface Eth1/51 has been removed
2023 Feb 25 16:18:54 QROMSPCNXL3B201 %BFD-5-SESSION_REMOVED: BFD session to neighbor 10.27.4.1 on interface Eth1/49 has been removed
2023 Feb 25 16:18:55 QROMSPCNXL3B201 %ARP-3-DUP_VADDR_SRC_IP: arp [30337] Source address of packet received from 0000.0c9f.f15f on Vlan153(port-channel30) is duplicate of local virtual ip, 10.27.1.81
2023 Feb 25 16:19:29 QROMSPCNXL3B201 last message repeated 3 times
2023 Feb 25 16:20:36 QROMSPCNXL3B201 last message repeated 6 times
2023 Feb 25 16:21:44 QROMSPCNXL3B201 last message repeated 6 times
2023 Feb 25 16:22:52 QROMSPCNXL3B201 last message repeated 6 times
2023 Feb 25 16:24:00 QROMSPCNXL3B201 last message repeated 6 times
2023 Feb 25 16:25:07 QROMSPCNXL3B201 last message repeated 6 times
2023 Feb 25 16:26:15 QROMSPCNXL3B201 last message repeated 6 times
2023 Feb 25 16:27:22 QROMSPCNXL3B201 last message repeated 6 times
2023 Feb 25 16:28:31 QROMSPCNXL3B201 last message repeated 6 times
2023 Feb 25 16:29:34 QROMSPCNXL3B201 last message repeated 5 times
2023 Feb 25 16:29:34 QROMSPCNXL3B201 %ETHPORT-5-SPEED: Interface Ethernet1/51, operational speed changed to 10 Gbps
2023 Feb 25 16:29:34 QROMSPCNXL3B201 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/51, operational duplex mode changed to Full
2023 Feb 25 16:29:34 QROMSPCNXL3B201 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/51, operational Receive Flow Control state changed to off
2023 Feb 25 16:29:34 QROMSPCNXL3B201 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/51, operational Transmit Flow Control state changed to off
2023 Feb 25 16:29:34 QROMSPCNXL3B201 %ETHPORT-5-IF_UP: Interface Ethernet1/51 is up in Layer3
2023 Feb 25 16:29:39 QROMSPCNXL3B201 %ARP-3-DUP_VADDR_SRC_IP: arp [30337] Source address of packet received from 0000.0c9f.f15f on Vlan153(port-channel30) is duplicate of local virtual ip, 10.27.1.81
2023 Feb 25 16:29:52 QROMSPCNXL3B201 last message repeated 1 time
2023 Feb 25 16:29:52 QROMSPCNXL3B201 %ETHPORT-5-SPEED: Interface Ethernet1/49, operational speed changed to 10 Gbps
2023 Feb 25 16:29:52 QROMSPCNXL3B201 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/49, operational duplex mode changed to Full
2023 Feb 25 16:29:52 QROMSPCNXL3B201 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/49, operational Receive Flow Control state changed to off
2023 Feb 25 16:29:52 QROMSPCNXL3B201 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/49, operational Transmit Flow Control state changed to off
2023 Feb 25 16:29:52 QROMSPCNXL3B201 %ETHPORT-5-IF_UP: Interface Ethernet1/49 is up in Layer3
2023 Feb 25 16:29:52 QROMSPCNXL3B201 %BGP-5-ADJCHANGE: bgp- [594] (PSTN) neighbor 10.27.4.33 Up
2023 Feb 25 16:29:53 QROMSPCNXL3B201 %BFD-5-SESSION_MOVED: BFD session 0x41000016: Installed on LC 1
2023 Feb 25 16:29:53 QROMSPCNXL3B201 %BFD-5-SESSION_CREATED: BFD session to neighbor 10.27.4.33 on interface Eth1/51 has been created
2023 Feb 25 16:29:57 QROMSPCNXL3B201 %BGP-5-ADJCHANGE: bgp- [594] (TELCEL) neighbor 10.27.4.1 Up
2023 Feb 25 16:29:58 QROMSPCNXL3B201 %BFD-5-SESSION_MOVED: BFD session 0x41000017: Installed on LC 1
2023 Feb 25 16:29:58 QROMSPCNXL3B201 %BFD-5-SESSION_CREATED: BFD session to neighbor 10.27.4.1 on interface Eth1/49 has been created
2023 Feb 25 16:30:00 QROMSPCNXL3B201 %BFD-5-SESSION_STATE_UP: BFD session 1090519062 to neighbor 10.27.4.33 on interface Eth1/51 is up.
2023 Feb 25 16:30:02 QROMSPCNXL3B201 %ARP-3-DUP_VADDR_SRC_IP: arp [30337] Source address of packet received from 0000.0c9f.f15f on Vlan153(port-channel30) is duplicate of local virtual ip, 10.27.1.81
2023 Feb 25 16:30:04 QROMSPCNXL3B201 %BFD-5-SESSION_STATE_UP: BFD session 1090519063 to neighbor 10.27.4.1 on interface Eth1/49 is up.
2023 Feb 25 16:30:13 QROMSPCNXL3B201 %ARP-3-DUP_VADDR_SRC_IP: arp [30337] Source address of packet received from 0000.0c9f.f15f on Vlan153(port-channel30) is duplicate of local

 

Thanks

Rakesh

MHM Cisco World
VIP Mentor VIP Mentor
VIP Mentor

Core-SW connect to ASR via PO30 
the issue I think is PO 
can you share 
show etherchannel summary
show lacp internal 
show lacp counter

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