H3C Technologies H3C S12500-X Series Switches - Manual (Page 210)

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Step Command Remarks
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ip vpn-instance
vpn-instance-name
N/A
3. Create an EBGP peer group. group group-name external
By default, no EBGP peer group is
created.
4. Add a peer into the EBGP
peer group. peer ipv6-address group
group-name as-number as-number By default, no peer exists in the
peer group.
5. (Optional.) Configure a
description for the peer group. peer group-name description
description-text By default, no description is
configured for the peer group.
6. Create and enter BGP IPv6
unicast address family view or
BGP-VPN IPv6 unicast
address family view.
address-family ipv6 [ unicast ]
By default, the BGP IPv6 unicast
address family view and BGP-VPN
IPv6 unicast address family view
are not created.
7. Enable the router to exchange
IPv6 unicast routing
information with peers in the
specified peer group.
peer group-name enable
By default, the router cannot
exchange IPv6 unicast routing
information with the peers.
311B
Specifying the source interface for TCP connections
By default, 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, and it uses the IP address/IPv6
address of the output interface as the source IP address/IPv6 address of TCP connections. You can
change the source interface in the following scenarios:
• If the peer's IP address/IPv4 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. If you use the peer
x.x.x.x as-number as-number command in which x.x.x.x is not the IP address of interface B on the
local end, 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.
• On a BGP router that has multiple links to a peer, if the source interface fails, BGP has to reestablish
TCP connections. To avoid this problem, use a loopback interface as the source interface.
• To establish multiple BGP sessions between two routers, specify the source interface for establishing
TCP connections to each peer on the local router. Otherwise, the local BGP router might fail to
establish a TCP connection 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 (IPv4):
Step Command Remarks
1. Enter system view. system-view N/A