Controlling Route Generation; Configuration Prerequisites - HPE 5800 Series Configuration Manual

peer or peer group. The primary IP address of the output interface is used for establishing TCP
connections. You can specify the source interface (primary IP address) for TCP connections in the
following scenarios:
•
If the peer's IP address belongs to an interface indirectly connected to the local router, you must
specify that interface as the source interface for TCP connections on the peer. For example,
interface A on the local end is directly connected to interface B on the peer. When you execute
the peer x.x.x.x as-number as-number command on the local end to specify the BGP peer, and
x.x.x.x is not the IP address of interface B, you must use the peer connect-interface command
on the peer to specify the interface whose IP address is x.x.x.x as the source interface for
establishing a TCP connection.
•
If a BGP router has multiple links to a peer and the source interface fails, BGP has to
reestablish TCP connections, causing network oscillation. To enhance stability of TCP
connections, Hewlett Packard Enterprise recommends that you use a loopback interface as the
source interface.
•
To establish multiple BGP sessions 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:
Step
Enter system view.
1.
Enter BGP view or
2.
BGP-VPN instance view.
Specify the source
3.
interface for establishing
TCP connections to a peer
or peer group.

Controlling route generation

Generating BGP routes can be done in the following ways:
•
Configure BGP to advertise local networks.
•
Configure BGP to redistribute IGP routes.

Configuration prerequisites

Create and configure a routing policy. For more information, see
Command
system-view
•
Enter BGP view:
bgp as-number
•
Enter BGP-VPN instance
view:
a. bgp as-number
b. ipv4-family
vpn-instance
vpn-instance-name
peer { group-name | ip-address }
connect-interface interface-type
interface-number
186
Remarks
N/A
Use either approach.
By default, BGP uses the outbound
interface of the best route to the
BGP peer or peer group as the
source interface for establishing a
TCP connection to the peer or peer
group.
"Configuring routing policies."