Configuration procedure – H3C Technologies H3C S10500 Series Switches User Manual
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Configuration procedure
1.
Configure IP addresses for interfaces. (Details not shown)
2.
Configure OSPF to ensure that Switch A and Switch C are reachable to each other. (Details not
shown)
3.
Configure BGP on Switch A.
# Establish two iBGP connections between Switch A and Switch C.
[SwitchA] bgp 100
[SwitchA-bgp] peer 3.0.2.2 as-number 200
[SwitchA-bgp] peer 2.0.2.2 as-number 200
[SwitchA-bgp] quit
# When the two links between Switch A and Switch C are both up, Switch C adopts the link Switch
A<—>Switch B<—>Switch 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 Switch A.)
•
Create ACL 2000 to permit 1.1.1.0/24 to pass.
[SwitchA] acl number 2000
[SwitchA-acl-basic-2000] rule permit source 1.1.1.0 24
[SwitchA-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.
[SwitchA] route-policy apply_med_50 permit node 10
[SwitchA-route-policy] if-match acl 2000
[SwitchA-route-policy] apply cost 50
[SwitchA-route-policy] quit
[SwitchA] route-policy apply_med_100 permit node 10
[SwitchA-route-policy] if-match acl 2000
[SwitchA-route-policy] apply cost 100
[SwitchA-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.
[SwitchA] bgp 100
[SwitchA-bgp] peer 3.0.2.2 route-policy apply_med_50 export
[SwitchA-bgp] peer 2.0.2.2 route-policy apply_med_100 export
# Configure BFD over the link to peer 3.0.2.2 so that when the link Switch A<—>Switch B<—>Switch C
fails, BFD can quickly detect the failure and notify it to BGP, and then the link Switch A<—>Switch
D<—>Switch C takes effect immediately.
[SwitchA-bgp] peer 3.0.2.2 bfd
[SwitchA-bgp] quit
4.
Configure BGP on Switch C.
[SwitchC] bgp 100
[SwitchC-bgp] peer 3.0.1.1 as-number 200
[SwitchC-bgp] peer 3.0.1.1 bfd
[SwitchC-bgp] peer 2.0.1.1 as-number 200
[SwitchC-bgp] quit
5.
Configure BFD parameters (you can use default BFD parameters instead).