H3C Technologies H3C S6800 Series Switches - Manual (Page 284)

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[PE2] bgp 100
[PE2-bgp] primary-path-detect bfd echo
# Configure FRR for VPN instance vpn1 to reference routing policy frr.
[PE2-bgp] ip vpn-instance vpn1
[PE2-bgp-vpn1] address-family ipv4 unicast
[PE2-bgp-ipv4-vpn1] fast-reroute route-policy frr
# Specify the preferred value as 200 for BGP routes received from CE 2. This value is greater than
the preferred value (0) for routes from PE 3, so PE 2 prefers the routes from CE 2.
[PE2-bgp-ipv4-vpn1] peer 10.1.1.1 preferred-value 200
[PE2-bgp-vpn1] quit
[PE2-bgp] quit
Verifying the configuration
# Display detailed information about the route to 4.4.4.4/32 on PE 2. The output shows the backup next
hop for the route.
[PE2] display ip routing-table vpn-instance vpn1 4.4.4.4 32 verbose
Summary Count : 1
Destination: 4.4.4.4/32
Protocol: BGP Process ID: 0
SubProtID: 0x2 Age: 01h54m24s
Cost: 0 Preference: 10
IpPre: N/A QosLocalID: N/A
Tag: 0 State: Active Adv
OrigTblID: 0x0 OrigVrf: vpn1
TableID: 0x102 OrigAs: 300
NibID: 0x15000002 LastAs: 300
AttrID: 0x0 Neighbor: 10.1.1.1
Flags: 0x10060 OrigNextHop: 10.1.1.1
Label: NULL RealNextHop: 10.1.1.1
BkLabel: 1275 BkNextHop: 172.3.1.3
Tunnel ID: Invalid Interface: Vlan-int13
BkTunnel ID: 0x409 BkInterface: Vlan-int15
FtnIndex: 0x0
Configuring MPLS L3VPN FRR through IPv4 route backup for a
VPNv4 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.
Configure MPLS L3VPN FRR on PE 2 to achieve the following purposes: