3Com Switch 4800G 24-Port Configuration Manual page 470

470 C 36: IP 6 BGP C
HAPTER V
Specifying the Source
Interface for
Establishing TCP
Connections
n
Allowing the
establishment of a
Non-Direct EBGP
connection
c
ONFIGURATION
for routes from a peer, the routing policy sets a non-zero preferred value for
routes matching it. Other routes not matching the routing policy uses the value set
with the command. If the preferred value in the routing policy is zero, the routes
matching it will also use the value set with the command. For information about
using a routing policy to set a preferred value, refer to the peer
{ ipv6-group-name | ipv6-address } route-policy route-policy-name { import |
export } command and the apply preferred-value preferred-value command.
Follow these steps to specify the source interface for establishing TCP connections
to a BGP peer or peer group:
To do...
Enter system view
Enter BGP view
Enter IPv6 address family view
Specify the source interface for
establishing TCP connections to
a BGP peer or peer group
To improve stability and reliability, you can specify a loopback interface as the
■
source interface for establishing TCP connections to a BGP peer. By doing so, a
connection failure upon redundancy availability will not affect TCP connection
establishment.
To establish multiple BGP connections to a BGP router, you need to specify on
■
the local router the respective source interfaces for establishing TCP
connections to the peers on the peering BGP router; otherwise, the local BGP
router may fail to establish TCP connections to the peers when using the
outbound interfaces of the best routes as the source interfaces.
Follow these steps to allow the establishment of EBGP connection to a
non-directly connected peer/peer group:
To do...
Enter system view
Enter BGP view
Enter IPv6 address family view ipv6-family
Allow the establishment of
EBGP connection to a non
directly connected peer/peer
group
CAUTION: In general, direct links should 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
connection with loopback interfaces.
Use the command...
system-view
bgp as-number
ipv6-family
peer { ipv6-group-name |
ipv6-address }
connect-interface
interface-type
interface-number
Use the command...
system-view
bgp as-number
peer { ipv6-group-name |
ipv6-address }
ebgp-max-hop [ hop-count ]
Remarks
-
Required
-
Required
By default, IPv6 BGP uses the
outbound interface of the
best route to the BGP peer as
the source interface for
establishing a TCP
connection.
Remarks
-
Required
-
Required
Not configured by default