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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):
Step
1.
Enter system view.
2.
Configure the source
address of echo packets.
3.
Create a routing policy and
enter routing policy view.
4.
Set the backup next hop for
FRR.
5.
Return to system view.
6.
Enter BGP instance view.
7.
(Optional.) Use echo-mode
BFD to detect the
connectivity to the next hop
of the primary route.
8.
(Optional.) Enter BGP-VPN
instance view.
Command
system-view
bfd echo-source-ip ipv4-address
route-policy route-policy-name
permit node node-number
apply fast-reroute
backup-nexthop ipv4-address
quit
bgp as-number [ instance
instance-name ]
primary-path-detect bfd echo
ip vpn-instance
vpn-instance-name
306
Remarks
N/A
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.
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.
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.
N/A
N/A
By default, ARP is used to detect
the connectivity to the next hop.
N/A
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Table of Contents
Troubleshooting
