H3C Technologies H3C S10500 Series Switches - Manual (Page 221)

206
Follow these steps to create a BGP connection:
To do… Use the command… Remarks
Enter system view system-view —
Configure a global router ID router id router-id
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.
Enable BGP and enter BGP view bgp as-number
Required
Not enabled by default
Specify a router ID router-id router-id
Optional
By default, the global router ID is
used.
Specify a peer or a peer group and
its AS number peer { group-name | ip-address }
as-number as-number Required
Not specified by default
Enable the default use of IPv4
unicast address family for the peers
that are established using the peer
as-number command
default ipv4-unicast
Optional
Enabled by default
Enable a peer peer ip-address enable
Optional
Enabled by default
Configure a description for a
peer/peer group peer { group-name | ip-address }
description description-text
Not configured by default.
NOTE:
•
A router can reside in only one AS, so the router can run only one BGP process.
• You must create a peer group before configuring it.
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, H3C recommends
using a loopback interface as the source interface.
Follow these steps to specify the source interface for TCP connections:
To do… Use the command… Remarks
Enter system view system-view —