H3C Technologies H3C SR8800 - Manual (Page 276)

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Figure 98 Network diagram
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown)
2. Configure OSPF so that Router A and Router C are reachable to each other. (Details not shown)
3. Configure BGP on Router A:
# Establish two IBGP connections between Router A and Router C.
system-view
[RouterA] bgp 200
[RouterA-bgp] peer 3.0.2.2 as-number 200
[RouterA-bgp] peer 2.0.2.2 as-number 200
[RouterA-bgp] quit
# When the two links between Router A and Router C are both up, Router C adopts the link Router
A<—>Router B<—>Router C to exchange packets with network 1.1.1.0/24. (Set a higher MED
value for route 1.1.1.0/24 sent to peer 2.0.2.2 on Router A.)
{
Create ACL 2000 to permit 1.1.1.0/24 to pass.
[RouterA] acl number 2000
[RouterA-acl-basic-2000] rule permit source 1.1.1.0 0.0.0.255
[RouterA-acl-basic-2000] quit
{
Create two route policies, apply_med_50 and apply_med_100. Policy apply_med_50 sets the
MED for route 1.1.1.0/24 to 50. Policy apply_med_100 sets that to 100.
[RouterA] route-policy apply_med_50 permit node 10
[RouterA-route-policy] if-match acl 2000
[RouterA-route-policy] apply cost 50
[RouterA-route-policy] quit
[RouterA] route-policy apply_med_100 permit node 10
[RouterA-route-policy] if-match acl 2000
[RouterA-route-policy] apply cost 100
[RouterA-route-policy] quit
{
Apply routing policy apply_med_50 to routes outgoing to peer 3.0.2.2, and apply routing
policy apply_med_100 to routes outgoing to peer 2.0.2.2.
[RouterA] bgp 200
[RouterA-bgp] peer 3.0.2.2 route-policy apply_med_50 export
[RouterA-bgp] peer 2.0.2.2 route-policy apply_med_100 export
2.0.1. 1/ 24
2. 0.2.2/24
Router A Router C
AS 200
Router D
2. 0.1.2/24 2. 0. 2.1/24
3. 0.1.1/24
3. 0.1.2/24 3.0.2. 1/ 24
3.0.2. 2/ 24
Router B
AS 100 AS 300 1. 1.1.0/24
GE3/1/2 GE3/1/1
GE3/1/1
GE3/1/1
GE3/1/1
GE3/1/2
GE3/1/2
GE3/1/2