IPv6 BGP FRR configuration example
Network requirements
As shown in Figure 87, configure BGP FRR so that when Link B fails, BGP uses Link A to forward traffic.
Figure 87: Network diagram
Configuration procedure
Configure IPv6 addresses for interfaces. (Details not shown.)
Configure OSPFv3 in AS 200 to ensure connectivity among Switch B, Switch C, and Switch D. (Details not shown.)
Configure BGP connections:
# Configure Switch A to establish EBGP sessions to Switch B and Switch C, and advertise network 1::/64.
<SwitchA> system-view [SwitchA] bgp 100 [SwitchA] router-id 1.1.1.1 [SwitchA-bgp-default] peer 3001::2 as-number 200 [SwitchA-bgp-default] peer 2001::2 as-number 200 [SwitchA-bgp-default] address-family ipv6 unicast [SwitchA-bgp-default-ipv6] peer 3001::2 enable [SwitchA-bgp-default-ipv6] peer 2001::2 enable [SwitchA-bgp-default-ipv6] network 1:: 64 [SwitchA-bgp-default-ipv6] quit [SwitchA-bgp-default] quit
# Configure Switch B to establish an EBGP session to Switch A, and an IBGP session to Switch D.
<SwitchB> system-view [SwitchB] bgp 200 [SwitchB] router-id 2.2.2.2 [SwitchB-bgp-default] peer 3001::1 as-number 100 [SwitchB-bgp-default] peer 3002::2 as-number 200 [SwitchB-bgp-default] address-family ipv6 unicast [SwitchB-bgp-default-ipv6] peer 3001::1 enable [SwitchB-bgp-default-ipv6] peer 3002::2 enable [SwitchB-bgp-default-ipv6] peer 3002::2 next-hop-local [SwitchB-bgp-default-ipv6] quit [SwitchB-bgp-default] quit
# Configure Switch C to establish an EBGP session to Switch A, and an IBGP session to Switch D.
<SwitchC> system-view [SwitchC] bgp 200 [SwitchC] router-id 3.3.3.3 [SwitchC-bgp-default] peer 2001::1 as-number 100 [SwitchC-bgp-default] peer 2002::2 as-number 200 [SwitchC-bgp-default] address-family ipv6 unicast [SwitchC-bgp-default-ipv6] peer 2001::1 enable [SwitchC-bgp-default-ipv6] peer 2002::2 enable [SwitchC-bgp-default-ipv6] peer 2002::2 next-hop-local [SwitchC-bgp-default-ipv6] quit [SwitchC-bgp-default] quit
# Configure Switch D to establish IBGP sessions to Switch B and Switch C, and advertise network 4::/64.
<SwitchD> system-view [SwitchD] bgp 200 [SwitchD-bgp-default] peer 3002::1 as-number 200 [SwitchD-bgp-default] peer 2002::1 as-number 200 [SwitchD-bgp-default] address-family ipv6 unicast [SwitchD-bgp-default-ipv6] peer 3002::1 enable [SwitchD-bgp-default-ipv6] peer 2002::1 enable [SwitchD-bgp-default-ipv6] network 4:: 64 [SwitchD-bgp-default-ipv6] quit [SwitchD-bgp-default] quit
Configure preferred values so Link B is used to forward traffic between Switch A and Switch D:
# Configure Switch A to set the preferred value to 100 for routes received from Switch B.
[SwitchA-bgp-default-ipv6] peer 3001::2 preferred-value 100 [SwitchA-bgp-default-ipv6] quit [SwitchA-bgp-default] quit
# Configure Switch D to set the preferred value to 100 for routes received from Switch B.
[SwitchD-bgp-default-ipv6] peer 3002::1 preferred-value 100 [SwitchD-bgp-default-ipv6] quit [SwitchD-bgp-default] quit
Configure BGP FRR:
# On Switch A, create routing policy frr to set a backup next hop 2001::2 (Switch C) for the route destined for 4::/64.
<SwitchA> system-view [SwitchA] ipv6 prefix-list abc index 10 permit 4:: 64 [SwitchA] route-policy frr permit node 10 [SwitchA-route-policy] if-match ipv6 address prefix-list abc [SwitchA-route-policy] apply ipv6 fast-reroute backup-nexthop 2001::2 [SwitchA-route-policy] quit
# Apply the routing policy to BGP FRR for BGP IPv6 unicast address family.
[SwitchA] bgp 100 [SwitchA-bgp-default] address-family ipv6 unicast [SwitchA-bgp-default-ipv6] fast-reroute route-policy frr [SwitchA-bgp-default-ipv6] quit [SwitchA-bgp-default] quit
# On Switch D, create routing policy frr to set a backup next hop 2002::1 (Switch C) for the route destined for 1::/64.
<SwitchD> system-view [SwitchD] ipv6 prefix-list abc index 10 permit 1:: 64 [SwitchD] route-policy frr permit node 10 [SwitchD-route-policy] if-match ipv6 address prefix-list abc [SwitchD-route-policy] apply ipv6 fast-reroute backup-nexthop 2002::1 [SwitchD-route-policy] quit
# Apply the routing policy to BGP FRR for BGP IPv6 unicast address family.
[SwitchD] bgp 200 [SwitchD-bgp-default] address-family ipv6 unicast [SwitchD-bgp-default-ipv6] fast-reroute route-policy frr [SwitchD-bgp-default-ipv6] quit [SwitchD-bgp-default] quit
Verifying the configuration
# Display detailed information about the route to 4::/64 on Switch A. The output shows the backup next hop for the route.
[SwitchA] display ipv6 routing-table 4:: 64 verbose
Summary count : 1
Destination: 4::/64
Protocol: BGP4+ Process ID: 0
SubProtID: 0x2 Age: 00h00m58s
Cost: 0 Preference: 255
IpPre: N/A QosLocalID: N/A
Tag: 0 State: Active Adv
OrigTblID: 0x0 OrigVrf: default-vrf
TableID: 0xa OrigAs: 200
NibID: 0x25000003 LastAs: 200
AttrID: 0x3 Neighbor: 3001::2
Flags: 0x10060 OrigNextHop: 3001::2
Label: NULL RealNextHop: 3001::2
BkLabel: NULL BkNextHop: 2001::2
Tunnel ID: Invalid Interface: Vlan-interface 100
BkTunnel ID: Invalid BkInterface: Vlan-interface 200
FtnIndex: 0x0
# Display detailed information about the route to 1::/64 on Switch D. The output shows the backup next hop for the route.
[SwitchD] display ipv6 routing-table 1:: 64 verbose
Summary count : 1
Destination: 1::/64
Protocol: BGP4+ Process ID: 0
SubProtID: 0x1 Age: 00h03m24s
Cost: 0 Preference: 255
IpPre: N/A QosLocalID: N/A
Tag: 0 State: Active Adv
OrigTblID: 0x0 OrigVrf: default-vrf
TableID: 0xa OrigAs: 100
NibID: 0x25000003 LastAs: 100
AttrID: 0x4 Neighbor: 3002::1
Flags: 0x10060 OrigNextHop: 3002::1
Label: NULL RealNextHop: 3002::1
BkLabel: NULL BkNextHop: 2002::1
Tunnel ID: Invalid Interface: Vlan-interface 101
BkTunnel ID: Invalid BkInterface: Vlan-interface 201
FtnIndex: 0x0