N7K packet loss in transmit

[haryortheyji]

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 

[MHM Cisco World]

do you config the HSRP in NSK vPC ?

[haryortheyji]

HSRP is configured for the interested vlan. n7k-1 is active and n7k-2 is standby.

[MHM Cisco World]

do peer-gateway and see the result.

[haryortheyji]

 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)

[MHM Cisco World]

the HSRP group is mismatch? can you reconfig it again and test again ?

[haryortheyji]

HSRP Group corrected but there is intermittent packet loss from the n7k to the remote server.

[MHM Cisco World]

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"

[haryortheyji]

The peer-gateway is configured

[haryortheyji]

Can you hint me how do I check the mac address of the loss packet from the ping result?

[MHM Cisco World]

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.