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Method 1—Execute the pic command in BGP address family view. BGP calculates a backup
next hop for each BGP route in the address family if there are two or more unequal-cost routes
that reach the destination.
Method 2—Execute the fast-reroute route-policy command to use a routing policy in which a
backup next hop is specified by using the command apply [ ipv6 ] fast-reroute
backup-nexthop. The backup next hop calculated by BGP must be the same as the specified
backup next hop. Otherwise, BGP does not generate a backup next hop for the primary route.
You can also configure if-match clauses in the routing policy to identify the routes protected by
FRR.
If both methods are configured, Method 2 takes precedence over Method 1.
BGP supports FRR for IPv4 and IPv6 unicast routes, but not for IPv4 and IPv6 multicast routes.
To configure BGP FRR (IPv4 unicast address family):
1. Enter system view.
N/A
2. Configure the source
address of echo packets.
bfd echo-source-ip
ipv4-address
By default, no source address is
specified for echo packets.
This step is required when
echo-mode BFD is used to
detect the connectivity to the
next hop of the primary route.
Specify a source IP address that
does not belong to any local
network.
For more information about this
command, see High Availability
Command Reference.
3. Create a routing policy and
enter routing policy view.
route-policy
route-policy-name
permit node
node-number
By default, no routing policies
exist.
This step is required when
Method 2 is used to enable BGP
FRR.
For more information about this
command, see Layer 3—IP
Routing Command Reference.
4. Set the backup next hop for
FRR.
apply fast-reroute
backup-nexthop
ipv4-address
By default, no backup next hop is
set.
This step is required when
Method 2 is used to enable BGP
FRR.
For more information about this
command, see Layer 3—IP
Routing Command Reference.
5. Return to system view.
quit
N/A
6. Enter BGP instance view.
bgp
as-number [
instance
instance-name ]
N/A
7. (Optional.) Use echo-mode
BFD to detect the
connectivity to the next hop
of the primary route.
primary-path-detect bfd echo
By default, ARP is used to detect
the connectivity to the next hop.
8. (Optional.) Enter BGP-VPN
instance view.
ip vpn-instance
vpn-instance-name
N/A
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