Specifying The Source Interface For Establishing Tcp Connections; Allowing The Establishment Of An Indirect Ebgp Connection - HPE 5800 Series Configuration Manual

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, which can cause network oscillation. To enhance stability of IPv6 BGP
connections, Hewlett Packard Enterprise 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 (IPv6
address family view):
Step
Enter system view.
1.
Enter BGP view.
2.
Enter IPv6 address family
3.
view.
Specify the source interface
4.
for establishing TCP
connections to an IPv6 BGP
peer or peer group.
To specify the source interface for establishing TCP connections to a BGP peer (IPv6 BGP-VPN
instance view):
Step
Enter system view.
1.
Enter BGP view.
2.
Enter IPv6 BGP-VPN
3.
instance view.
Specify the source interface
4.
for establishing TCP
connections to an IPv6 BGP
peer.

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:
Command
system-view
bgp as-number
ipv6-family
peer { ipv6-group-name |
ipv6-address } connect-interface
interface-type interface-number
Command
system-view
bgp as-number
ipv6-family vpn-instance
vpn-instance-name
peer ipv6-address
connect-interface interface-type
interface-number
319
Remarks
N/A
N/A
N/A
By default, IPv6 BGP uses the
outbound interface of the optimal
route to the IPv6 BGP peer or
peer group as the source
interface for establishing a TCP
connection.
Remarks
N/A
N/A
N/A
By default, IPv6 BGP uses the
outbound interface of the optimal
route to the IPv6 BGP peer as the
source interface for establishing a
TCP connection.