283
* >i 1.0.0.0 193.1.1.1 50 100 0 100i
* i 192.1.1.1 100 100 0 100i
Route 1.0.0.0/8 is the optimal.
{ (Method 2.) Configure different local preferences on Switch B and C for route 1.0.0.0/8,
making Switch D give priority to the route from Switch C:
# Define an ACL numbered 2000 on Switch C, permitting route 1.0.0.0/8.
[SwitchC] acl number 2000
[SwitchC-acl-basic-2000] rule permit source 1.0.0.0 0.255.255.255
[SwitchC-acl-basic-2000] quit
# Configure a routing policy named localpref on Switch C, setting the local preference of route
1.0.0.0/8 to 200 (the default is 100).
[SwitchC] route-policy localpref permit node 10
[SwitchC-route-policy-localpref-10] if-match ip address acl 2000
[SwitchC-route-policy-localpref-10] apply local-preference 200
[SwitchC-route-policy-localpref-10] quit
# Apply routing policy localpref to routes from peer 193.1.1.1.
[SwitchC] bgp 200
[SwitchC-bgp] address-family ipv4 unicast
[SwitchC-bgp-ipv4] peer 193.1.1.1 route-policy localpref import
[SwitchC-bgp-ipv4] quit
[SwitchC-bgp] quit
# Display the BGP routing table on Switch D.
[SwitchD] 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
Route 1.0.0.0/8 learned from Switch C is the optimal.
BGP GR configuration example
Network requirements
In Figure 71 are all BGP switches. EBGP runs between Switch A and Switch B. IBGP runs between Switch
B and Switch C. Enable GR capability for BGP so that the communication between Switch A and Switch
C is not affected when an active/standby switchover occurs on Switch B.
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