470 CHAPTER 36: IPV6 BGP CONFIGURATION
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.
Specifying the Source
Interface for
Establishing TCP
Connections
Follow these steps to specify the source interface for establishing TCP connections
to a BGP peer or peer group:
n
■ 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.
Allowing the
establishment of a
Non-Direct EBGP
connection
Follow these steps to allow the establishment of EBGP connection to a
non-directly connected peer/peer group:
c
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.
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number Required
Enter IPv6 address family view ipv6-family -
Specify the source interface for
establishing TCP connections to
a BGP peer or peer group
peer { ipv6-group-name |
ipv6-address }
connect-interface
interface-type
interface-number
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.
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number Required
Enter IPv6 address family view ipv6-family -
Allow the establishment of
EBGP connection to a non
directly connected peer/peer
group
peer { ipv6-group-name |
ipv6-address }
ebgp-max-hop [ hop-count ]
Required
Not configured by default
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