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Configuring BGP 455
By default, MED values from different AS neighboring routes are not compared
when determining the best route.
This configuration should not be used unless it is certain that different ASs uses
the same IGP and routing modes.
Configuring the Local
Preference
Configuring different local preferences affects BGP routing selection. When a
router running BGP gets routes with the same destination address but different
next hops through different internal peers, it selects the route of the highest local
preference to this destination.
Perform the following configurations in BGP view.
Table 524 Configure the Local Preference
By default, the value of local preference is 100.
Configuring BGP Timers The interval of sending keepalive messages required by RFC and BGP holdtime are
important parameters in BGP protocol.
When a router has created a BGP connection successfully with the other router, it
sends keepalive messages to this router with the time interval set by the
keepalive-interval attribute to indicate whether the connection channel is
normal. Generally, the time interval for sending a keepalive message is one third of
the value for the
holdtime attribute.
The value of the holdtime-interval attribute is the time interval for continuously
receiving keepalive and update messages. If a keepalive or update message is
received, the holding timer is reset. If a router has not received any messages from
the opposite router for a specific period of holding time, this BGP connection is
considered broken and is cut off. The router can negotiate with the
interconnected router to set a shorter holding time.
Perform the following configurations in BGP view.
Table 525 Configure the Keepalive Timer and Holdtime Tmer for BGP
By default, the value for the keepalive-interval attribute is 60 seconds and may
have a value ranging from 1 to 4294967295 seconds. The default value for the
Allow comparing path MED compare-different-as-med
Prohibit comparing path MED undo compare-different-as-med
Operation Command
Configure the local preference default local-preference value
Restore the local preference value to its
default value
undo default local-preference
Operation Command
Configure the keepalive timer and
holdtime timer for BGP
timers keepalive-interval
holdtime-interval
Restore BGP network timers to their
default value
undo timers