326
Configuring a preferred value for routes from a peer or peer
group
If you both reference a routing policy and use the command
peer
{
ipv6-group-name
|
ipv6-address
}
preferred-value
value
to set a preferred value for routes from a peer, the routing policy sets the specific
preferred value for routes matching it. If the preferred value in the routing policy is zero, the routes use the
value set with the
peer
{
ipv6-group-name
|
ipv6-address
}
preferred-value
value
command. For how to
use a routing policy to set a preferred value, see the command
peer
{
group-name
|
ipv4-address
|
ipv6-address
}
route-policy
route-policy-name
{
import
|
export
} in this chapter, and the command
apply preferred-value
preferred-value
in
Layer 3—IP Routing Command Reference
.
To configure a preferred value for routes from a peer or peer group:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP view.
bgp
as-number
N/A
3.
Enter IPv6 address family
view.
ipv6-family
N/A
4.
Configure a preferred value
for routes received from an
IPv6 peer or peer group.
peer
{
ipv6-group-name
|
ipv6-address
}
preferred-value
value
By default, the preferred value is 0.
Specifying the source interface for establishing TCP
connections
IPv6 BGP uses TCP as the transport layer protocol. By default, IPv6 BGP uses the output interface of the
optimal route to a peer or peer group as the source interface for establishing TCP connections to the peer
or peer group.
If an IPv6 BGP router has multiple links to a peer, and the source interface fails, IPv6 BGP has to
reestablish TCP connections, causing network oscillation. To enhance stability of IPv6 BGP connections,
HP recommends using a loopback interface as the source interface.
To establish a BGP connection, specify on the local router the source interface for establishing the TCP
connection to the peer on the peering BGP router. Otherwise, the local BGP router may fail to establish
TCP connection to the peer when using the outbound interface of the best route as the source interface.
To specify the source interface for establishing TCP connections to a BGP peer or peer group:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP view.
bgp
as-number
N/A
3.
Enter IPv6 address family
view.
ipv6-family
N/A
