Static Route Resetting

[laurieeppsa]

We have a static route set on a pair of Nexus 9k (Connected with a VPC ) for a subnet pointed to our Palo Alto FW. We have numerous other static routes to the same IP. For some reason, on only the second 9K, this particular static route for ONLY this subnet resets randomly. Other static routes for other subnets that point to the same IP show they have been up for 44 weeks. How do I even begin troubleshooting this? There is nothing in the 9K logs that I can find and I'm only finding out because the static route is redistributed to EIGRP to another device and the route occasionally decides to disappear for a second.

[Enes Simnica]

gDay @laurieeppsa If only one static route is dropping on one Nexus 9K, it’s usually a next-hop reachability issue. U should check:

• ARP flaps: sh ip arp ......

• Adjacency resets: sh logging | inc arp

• Object tracking:Make sure the route isn’t tied to a track statement.

• vPC side: Ensure the VLAN/VRF toward the firewall is consistent on both 9Ks.

Cause even a quick Arp timeout to the Palo Alto can make that single static route disappear for a second.....

check these links for help G: 

https://www.cisco.com/c/en/us/support/docs/dial-access/floating-static-route/118263-technote-nexthop-00.html

https://www.cisco.com/c/en/us/support/docs/switches/nexus-9000-series-switches/218333-understand-and-configure-nexus-9000-vpc.html

https://parcelsapp.com/en/carriers/route

also ping me if u need more help,,,, PEACE!

-Enes

[balaji.bandi]

Can you provide some configuration example to look what is wrong here ?

when you make changes onvPC you need to make changes on both the changes (until you have any automated tool can do the config both the switches)

Looks for me this may be manual error - again based on the information,

how are you redistributing to Static route to EIGRP ? how is other receiving routes ? (show output help here?)