Table 1. Feature History Table
BGP PIC Backup Path when the Primary Path is a Static Route with the next hop as an IP Address.
This feature is now supported on routers that have Cisco NC57 line cards installed and operate in native and compatibiltiy
This feature enables BGP PIC backup path when the primary path is a static route with the next hop as an IP Address.
Ensure that the Border Gateway Protocol (BGP) and the IP or Multiprotocol Label Switching (MPLS) network is up and running
at the customer site that is connected to the provider site by more than one path (multihomed).
BGP PIC does not support instances where the sum of number of primary paths and
backup paths is greater than 2. Hence, only one primary path and one backup path
Ensure that the backup or alternate path has a unique next hop that is not the same as the next hop of the best path.
BGP PIC: Export of Backup Path Agnostic to its Multipath Eligibility
The BGP PIC: Export of Backup Path Agnostic to its Multipath Eligibility feature improves BGP convergence after a network
failure. This convergence applies to both core and edge failures. The BGP PIC pre-programs a backup path so that when a failure
is detected, the backup path can immediately take over, thus enabling fast failover. This feature enables BGP PIC on VPNv4
with additional paths or when the multiple paths that are ineligible to be multipath are received from the same neighbor.
For backup paths to be multipath eligible, all the following attributes in the backup paths must be the same: weight, local
preference, autonomous system path, origin code, Multi Exit Discriminator (MED), and Interior Gateway Protocol (iGP) distance.
Also, the next hop router for each multipath must be different. This feature introduces flexibility to allow the import of
backup paths to the VRF even if the said attributes are not the same.
Router# router bgp 10
Router(config-bgp)# address-family vpnv4 unicast
router(config-bgp-af)# export to vrf allow backup
router bgp 10
address-family vpnv4 unicast
export to vrf allow backup