317
[PE1-bgp-default-vpn1] address-family ipv4 unicast
[PE1-bgp-default-ipv4-vpn1] fast-reroute route-policy frr
[PE1-bgp-default-ipv4-vpn1] quit
[PE1-bgp-default-vpn1] quit
# Specify the preferred value as 100 for routes received from PE 2. This value is greater than
the preferred value (0) for routes from PE 3, so PE 1 prefers the routes from PE 2.
[PE1-bgp-default] address-family vpnv4
[PE1-bgp-default-vpnv4] peer 2.2.2.2 preferred-value 100
[PE1-bgp-default-vpnv4] quit
[PE1-bgp-default] quit
3.
Enable MPLS BFD on PE 2.
<PE2> system-view
[PE2] mpls bfd enable
Verifying the configuration
# Display detailed information about the route to 4.4.4.4/32 on PE 1. The output shows the backup
next hop for the route.
[PE1] display ip routing-table vpn-instance vpn1 4.4.4.4 32 verbose
Summary Count : 1
Destination: 4.4.4.4/32
Protocol: BGP instance default
Process ID: 0
SubProtID: 0x1 Age: 00h00m03s
Cost: 0 Preference: 255
IpPre: N/A QosLocalID: N/A
Tag: 0 State: Active Adv
OrigTblID: 0x0 OrigVrf: default-vrf
TableID: 0x102 OrigAs: 300
NibID: 0x15000002 LastAs: 300
AttrID: 0x2 Neighbor: 2.2.2.2
Flags: 0x110060 OrigNextHop: 2.2.2.2
Label: 1146 RealNextHop: 172.1.1.2
BkLabel: 1275 BkNextHop: 172.2.1.3
Tunnel ID: Invalid Interface: GE1/1/2
BkTunnel ID: Invalid BkInterface: GE1/1/3
FtnIndex: 0x0 TrafficIndex: N/A
Connector: N/A
Configuring MPLS L3VPN FRR through VPNv4 route backup
for an IPv4 route
Network requirements
CE 1 and CE 2 belong to VPN 1.
Configure EBGP between CEs and PEs to exchange VPN routes.
Configure OSPF to ensure connectivity between PEs, and configure MP-IBGP to exchange VPNv4
routing information between PEs.