Specifying The Source Interface For Tcp Connections - HP MSR2000 series Configuration Manual

Step
1. Enter system view.
2. Configure a global router ID.
3. Enable BGP and enter BGP
view.
4. Specify a router ID.
5. Specify a peer or a peer
group and its AS number.
6. Enable the default use of IPv4
unicast address family for the
peers that are established
using the peer as-number
command.
7. Enable a peer.
8. Configure a description for a
peer/peer group.

Specifying the source interface for TCP connections

BGP uses TCP as the transport layer protocol. By default, BGP uses the output interface of the optimal
route to a peer/peer group as the source interface for establishing TCP connections to the peer or peer
group.
If a BGP router has multiple links to a peer, and the source interface fails, BGP must reestablish TCP
connections, causing network oscillation. To enhance stability of BGP connections, HP recommends
using a loopback interface as the source interface.
To establish multiple BGP connections between two routers, you must specify the source interface for
establishing TCP connections to each peer on the local router; otherwise, the local BGP router may fail
to establish TCP connections to a peer when using the outbound interface of the best route to the peer as
the source interface.
To specify the source interface for TCP connections:
Command
system-view
router id router-id
bgp as-number
router-id router-id
peer { group-name | ip-address }
as-number as-number
default ipv4-unicast
peer ip-address enable
peer { group-name | ip-address }
description description-text
200
Remarks
N/A
Optional.
Not configured by default.
If no global router ID is configured,
the highest loopback interface IP
address—if any—is used as the
router ID. If no loopback interface IP
address is available, the highest
physical interface IP address is used,
regardless of the interface status.
Not enabled by default.
Optional.
By default, the global router ID is
used.
Not specified by default.
Optional.
Enabled by default.
Optional.
Enabled by default.
A router can reside in only one AS,
so the router can run only one BGP
process.
Not configured by default.
You must create a peer group before
configuring it.