03-28-2022 08:52 AM
Hello team,
Am working on Nexus7k and trying to investigate the cause of packet loss when user send pings on some nodes to remote server. I have attached a sample of the ping result from the n7k to the server.
Just in the learning process especially Nexus switch
03-28-2022 08:54 AM
do you config the HSRP in NSK vPC ?
03-28-2022 09:54 AM
HSRP is configured for the interested vlan. n7k-1 is active and n7k-2 is standby.
03-28-2022 10:07 AM
do peer-gateway and see the result.
03-28-2022 12:51 PM
sh hsrp interface vlan 100
Vlan100 - Group 1000 (HSRP-V2) (IPv4)
Local state is Active, priority 90 (Cfged 90), may preempt
Forwarding threshold(for vPC), lower: 1 upper: 90
Hellotime 1 sec, holdtime 3 sec
Next hello sent in 0.312000 sec(s)
Virtual IP address is 10.0.13.254 (Cfged)
Active router is local
Standby router is 10.0.13.252 , priority 81 expires in 2.588000 sec(s)
sh hsrp interface vlan 100
Vlan100 - Group 100 (HSRP-V2) (IPv4)
Local state is Standby, priority 81 (Cfged 81), may preempt
Forwarding threshold(for vPC), lower: 1 upper: 81
Hellotime 1 sec, holdtime 3 sec
Next hello sent in 0.413000 sec(s)
Virtual IP address is 10.0.13.254 (Cfged)
Active router is 10.0.13.251, priority 90 expires in 1.522000 sec(s)
03-28-2022 01:00 PM
the HSRP group is mismatch? can you reconfig it again and test again ?
03-29-2022 05:07 AM
HSRP Group corrected but there is intermittent packet loss from the n7k to the remote server.
03-29-2022 05:12 AM - edited 03-29-2022 05:22 AM
Do you config the peer-gateway ?
there is rule in N7K that of packet pass through vPC peer-ink, then the packet will drop if it forward to other vPC member.
Peer-GW prevent the packet from pass through the vPC peer-link.
can you check the mac address of loss packet ? is it the mac address of standby HSRP "real MAC address"
03-29-2022 05:47 AM
03-29-2022 05:55 AM
Can you hint me how do I check the mac address of the loss packet from the ping result?
03-29-2022 07:40 AM
Check this link the answer why some Ping is loss.
https://community.cisco.com/t5/data-center-and-cloud-documents/packet-loss-when-pinging-from-to-a-nexus-7000/ta-p/3110226
also this link contain all info. about how we can capture the ICMP packet pass through the N7K.
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