Backup Routing

• EFA automates the backup routing configuration among the MCT nodes by configuring IPv4 or IPv6 IBGP neighborship between the MCT nodes.
• When the local-asn for a VRF (used in an endpoint group) is updated using the local-asn-add operation, the remote-asn of the backup routing IPv4 or IPv6 IBGP neighbors also gets updated.
• When the remote-asn of an existing backup routing BGP neighbor is updated, the corresponding BGP session is reset using clear ip bgp neighbor <neighbor-ip> vrf <tenant-vrf-name>, which lead to traffic disruption till the session is up.
• When the local-asn for a VRF (used in an endpoint group) is deleted using local-asn-delete operation, the remote-asn of the backup routing IPv4 or IPv6 IBGP neighbors also gets updated to the local-asn configured at the global router bgp level followed by the backup routing bgp session reset.

BGP neighbors (established with the EFA managed fabric devices and established by the devices not managed by EFA) must modify their remote-asn based on the modified local-asn.