Configuring Bgp Frr - HP HPE FlexNetwork 7500 series Configuration Manual

Step
2. Enter BGP instance view or
BGP-VPN instance view.
3. Enable BFD to detect the link to the
specified BGP peer or peer group.
To enable BFD for a BGP peer (IPv6 unicast/multicast address family):
Step
1. Enter system view.
2. Enter BGP instance view or
BGP-VPN instance view.
3. Enable BFD to detect the link to the
specified IPv6 BGP peer or peer
group.

Configuring BGP FRR

When a link fails, the packets on the link are discarded, and a routing loop might occur until BGP
completes routing convergence based on the new network topology.
You can enable BGP fast reroute (FRR) to resolve this issue.
Figure 66 Network diagram for BGP FRR
Router A
After you configure FRR on Router B as shown in
Router C for the primary route. BGP uses ARP (for IPv4), echo-mode BFD (for IPv4), or ND (for IPv6)
to detect the connectivity to Router D. When the link to Router D fails, BGP directs packets to the
backup next hop. At the same time, BGP calculates a new optimal route, and forwards packets over
the optimal route.
You can use the following methods to configure BGP FRR:
Backup nexthop: Router C
Router B
Command
•
Enter BGP instance view:
bgp as-number [ instance
instance-name ]
•
Enter BGP-VPN instance view:
a. bgp as-number [ instance
instance-name ]
b. ip vpn-instance
vpn-instance-name
peer { group-name | ipv4-address
[ mask-length ] } bfd [ multi-hop |
single-hop ]
Command
system-view
•
Enter BGP instance view:
bgp as-number [ instance
instance-name ]
•
Enter BGP-VPN instance view:
a. bgp as-number [ instance
instance-name ]
b. ip vpn-instance
vpn-instance-name
peer { group-name | ipv6-address
[ prefix-length ] } bfd [ multi-hop |
single-hop ]
Nexthop: Router D
Figure 66, BGP generates a backup next hop
305
Remarks
N/A
By default, BFD is
disabled.
Remarks
N/A
N/A
By default, BFD is
disabled.
Router E