274
# Define ACL 2000 to permit the route 1.0.0.0/8 on Router C.
[RouterC] acl number 2000
[RouterC-acl-basic-2000] rule permit source 1.0.0.0 0.255.255.255
[RouterC-acl-basic-2000] quit
# Define routing policy localpref on Router C to set the local preference of route 1.0.0.0/8 to
200 (the default is 100).
[RouterC] route-policy localpref permit node 10
[RouterC-route-policy-localpref-10] if-match ip address acl 2000
[RouterC-route-policy-localpref-10] apply local-preference 200
[RouterC-route-policy-localpref-10] quit
# Apply the routing policy localpref to the route from the peer 193.1.1.1 on Router C.
[RouterC] bgp 200
[RouterC-bgp] address-family ipv4 unicast
[RouterC-bgp-ipv4] peer 193.1.1.1 route-policy localpref import
[RouterC-bgp-ipv4] quit
[RouterC-bgp] quit
# Display the BGP routing table on Router D.
[RouterD] display bgp routing-table ipv4
Total number of routes: 2
BGP local router ID is 195.1.1.1
Status codes: * - valid, > - best, d - dampened, h - history,
s - suppressed, S - stale, i - internal, e - external
Origin: i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/Ogn
* >i 1.0.0.0 193.1.1.1 200 0 100i
* i 192.1.1.1 100 0 100i
The route 1.0.0.0/8 learned from Router C is the optimal route.
BGP GR configuration example
Network requirements
As shown in Figure 70, run EBGP between Router A and Router B, and run IBGP between Router B and
Router C. Configure BGP GR so that the communication between Router A and Router C is not affected
when an active/standby switchover occurs on Router B.
Figure 70 Network diagram
Router A
(GR helper)
AS 65008
Eth1/1
200.1.1.1/24
Router B
(GR Restarter)
Router C
(GR helper)
AS 65009
Eth1/1
8.1.1.1/8
Eth1/2
200.1.1.2/24
Eth1/2
9.1.1.1/24
Eth1/1
9.1.1.2/24
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