Hi,
I am using cisco Nexus9000 C9508 with 4 interfaces in lag each of 25G.
When traffic is going on, observed one of the interface going DOWN ending in Suspended mode. Observed Input discards on the interfaces.
Suddenly interface is going down and below logs are observed in logging. From my HW side, LACP BPDUs are being sent.
>>>
2023 Jun 12 18:39:02 spk-ptt-nexus-c9508-1 %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel10: Ethernet1/3/1 is down
2023 Jun 12 18:39:02 spk-ptt-nexus-c9508-1 %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet1/3/1 is down (Initializing)
2023 Jun 12 18:39:12 spk-ptt-nexus-c9508-1 %LACP-5-LACP_SUSPEND_INDIVIDUAL: LACP port Ethernet1/3/1(0x38014000) of port-channel Ethernet1/3/1(0x38014000) not receivi
ng any LACP BPDUs suspending (individual) port
2023 Jun 12 18:39:12 spk-ptt-nexus-c9508-1 %ETH_PORT_CHANNEL-5-PORT_SUSPENDED: Ethernet1/3/1: Ethernet1/3/1 is suspended
>>>
Could you please help me in identifying the root cause. Any help is appreciated.
>>>
spk-ptt-nexus-c9508-1# show interface ethernet 1/3/1
Ethernet1/3/1 is down (suspended(no LACP PDUs))
admin state is up, Dedicated Interface
Belongs to Po10
Hardware: 25000 Ethernet, address: 40ce.24e7.562c (bia 40ce.24e7.562c)
MTU 1500 bytes, BW 25000000 Kbit , DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, medium is broadcast
Port mode is trunk
auto-duplex, 25 Gb/s, media type is 100G
Beacon is turned off
Auto-Negotiation is turned off FEC mode is Rs-IEEE
Input flow-control is off, output flow-control is off
Auto-mdix is turned off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
EEE (efficient-ethernet) : n/a
admin fec state is Rs-IEEE, oper fec state is Rs-IEEE
Last link flapped 00:30:14
Last clearing of "show interface" counters 00:30:09
0 interface resets
Load-Interval #1: 30 seconds
30 seconds input rate 72 bits/sec, 0 packets/sec
30 seconds output rate 56 bits/sec, 0 packets/sec
input rate 72 bps, 0 pps; output rate 56 bps, 0 pps
Load-Interval #2: 5 minute (300 seconds)
300 seconds input rate 144 bits/sec, 0 packets/sec
300 seconds output rate 144 bits/sec, 0 packets/sec
input rate 144 bps, 0 pps; output rate 144 bps, 0 pps
RX
100440 unicast packets 160 multicast packets 0 broadcast packets
100598 input packets 8280997 bytes
0 jumbo packets 0 storm suppression bytes
0 runts 0 giants 0 CRC 0 no buffer
0 input error 0 short frame 0 overrun 0 underrun 0 ignored
0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop
0 input with dribble 100600 input discard
0 Rx pause
0 Stomped CRC
TX
0 unicast packets 158 multicast packets 0 broadcast packets
155 output packets 36021 bytes
0 jumbo packets
0 output error 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble 0 output discard
0 Tx pause
>>>
I have disabled FEC and observed CRC & FCS-Err counters getting incremented. With this link is not going down and LAG status is in UP state. Is there anything specific i can check what exactly is causing this?
Thanks,
Karthik
