Controlling bgp path selection, Specifying a preferred value for routes received – H3C Technologies H3C S5560 Series Switches User Manual

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Step Command

Remarks

3.

Enter BGP IPv6 unicast
address family view or

BGP-VPN IPv6 unicast
address family view.

address-family ipv6 [ unicast ]

N/A

4.

Configure IPv6 BGP route

dampening.

dampening [ half-life-reachable
half-life-unreachable reuse suppress

ceiling | route-policy

route-policy-name ] *

By default, IPv6 BGP route
dampening is not configured.

Controlling BGP path selection

By configuring BGP path attributes, you can control BGP path selection.

Specifying a preferred value for routes received

Perform this task to set a preferred value for specific routes to control BGP path selection.
Among multiple routes that have the same destination/mask and are learned from different peers, the

one with the greatest preferred value is selected as the optimal route.
To specify a preferred value for routes from a peer or peer group (IPv4):

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter BGP view or BGP-VPN
instance view.

Enter BGP view:

bgp as-number

Enter BGP-VPN instance view:

a.

bgp as-number

b.

ip vpn-instance

vpn-instance-name

N/A

3.

Enter BGP IPv4 unicast
address family view or

BGP-VPN IPv4 unicast
address family view.

address-family ipv4 [ unicast ]

N/A

4.

Specify a preferred value for
routes received from a peer or

peer group.

peer { group-name | ip-address
[ mask-length ] } preferred-value

value

The default preferred value is 0.

To specify a preferred value for routes from a peer or peer group (IPv6):

Step Command

Remarks

1.

Enter system view.

system-view

N/A

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