I have wan router connected to 2 N7K as cores running 4.2.4 under VPC domain 2 with a vpc11/LACP link to my downstream dual-homed N5k. A Fex2148 hangs off the N5k. Vlan 211 is configured on N7k and N5k and I have a server on the FEX as part of 211.

Their is network connectivity issue and I trace it to the wan router trying to get to the server. On a traceroute from router to server, the packet loops btwn the two N7k and dies.

Per design guide below, I had the impression this should work:

http://www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/DC_3_0/DC-3_0_IPInfra.html#wp1043848

http://www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/DC_3_0/DC-3_0_IPInfra.html#wp1045736

Below is my relevant configs. Routing and HSRP is working other than this. If I shutdown one of the hsrp, it works.

Both N7k has:

router ospf 1
  router-id 10.101.0.X
  log-adjacency-changes

Core2 has:

interface Vlan211
  no shutdown
  description ROW4-DC-SERVERS-PRODUCTION
  ip address 10.100.211.3/24
  ip router ospf 1 area 0.0.0.200
  ip pim sparse-mode
  ip igmp version 2
  hsrp 211
    preempt delay minimum 180
    priority 90
    timers  1  3
    ip 10.100.211.1

Core1 has:

interface Vlan211
  no shutdown
  description ROW4-DC-SERVERS-PRODUCTION
  ip address 10.100.211.2/24
  ip router ospf 1 area 0.0.0.200
  ip pim sparse-mode
  ip igmp version 2
  hsrp 211
    preempt delay minimum 180
    priority 110
    timers  1  3
    ip 10.100.211.1

Thanks