Overview
OSPF routes get withdrawn on all neighbors (NXOS 7K) when a VSS supervisor (IOS 6807) switch over is initiated by any of the following methods:
- Pulling active supervisor out
- redundancy force-switchover
- Rebooting chassis with active supervisory.
Hardware / Software
Cisco 6807
- 2x Cisco 6807
- 2x Sup6T (in each chassis)
- Firmware: 15.3(1)SY
- VSS
Nexus 7K
- 3x Cisco Nexus 7009
- 2x SUP1 (in each chassis)
- Firmware: 6.2(10)
Topology Overview
Two Cisco 6807's in VSS mode are peering with three different NS-OX 7K's via routed point-to-point port-channels from both VSS members to a single 7K.
Resolution
By default NX-OS does not support nsf cisco mode. The IOS device must be configured with nsf ietf. See example below:
router ospf 1
router-id 192.168.0.1
nsf ietf
redistribute static subnets route-map STATIC_TO_OSPF
passive-interface default
no passive-interface Port-channel9
no passive-interface Port-channel10
no passive-interface Port-channel11
no passive-interface Port-channel12
no passive-interface Vlan899