H3C S7500 Series Operation Manual page 390

Operation Manual – Routing Protocol
H3C S7500 Series Ethernet Switches
Configure the local
address as the next hop
address when a BGP
router advertises a route.
Configure
the
AS_Path
attribute
Caution:
Using a routing policy, you can configure the preference for the routes that match
the filtering conditions. For unmatched routes, the default preference is adopted.
If other conditions are the same, the route with the lowest MED value is preferred
to be the exterior route of the AS.
After BGP load balance is configured, no matter whether the peer next-hop-local
command is executed or not, the local router changes the next hop IP address to
its own IP address before advertising a route to its IBGP peers/peer group.
To do... Use the command...
peer group-name
next-hop-local
Configure
the number peer { group-name |
of local AS
ip-address }
number allow-as-loop
occurrences [ number ]
allowed
Assign an
peer group-name
AS number
as-number
for a peer
as-number
group
Configure
that the
BGP update
packets only
carry the
pubic AS
number in
peer group-name
the AS_Path public-as-only
attribute
when a peer
sends BGP
update
packets to
BGP peers.
Required
In some network, to ensure
an IBGP neighbor locates
the correct next hop, you can
configure the next hop
address of a route to be the
local address for a BGP
router to advertise route
information to IBGP peer
groups.
Optional
By default, the number of
local AS number
occurrences allowed is 1.
Optional
By default, the local AS
number is not assigned to a
peer group.
Optional
By default, a BGP update
packet carries the private AS
number.
6-16
Chapter 6 BGP Configuration
Remarks