HP VPN Firewall Appliances Network Management Configuration Guide
810
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 must 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 might 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:
Ste
p
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. Specify the source interface for
establishing TCP connections to
an IPv6 BGP peer or peer
group.
peer { ipv6-group-name |
ipv6-address } connect-interface
interface-type interface-number
By default, IPv6 BGP uses the
outbound interface of the best
route to the IPv6 BGP peer or peer
group as the source interface for
establishing a TCP connection.
Allowing the establishment of an indirect EBGP connection
In general, direct links must be available between EBGP peers. If not, you can use the peer
ebgp-max-hop command to establish a multi-hop TCP connection in between. However, you need not
use this command for direct EBGP connections with loopback interfaces.
To allow the establishment of EBGP connection to an indirectly connected peer or peer group:
Ste
p
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. Allow the establishment of EBGP connection
to an indirectly connected peer or peer
group.
peer { ipv6-group-name |
ipv6-address } ebgp-max-hop
[ hop-count ]
Not configured
by default.