H3C S9500 Series Operation Manual page 322

Operation Manual – Routing Protocol
H3C S9500 Series Routing Switches
The ebgp-value, ibgp-value and local-value arguments are in the range of 1 to 256. By
default, the first two is 256 and the last one is 130.
6.2.11 Configuring BGP Timer
After a BGP connection is established between two peers, they send Keepalive
message to each other periodically. If a router receives no Keepalive message or any
other type of packet within the set connection holdtime, the router regards the BGP
connection has been interrupted and quits the BGP connection.
When a router establishes a BGP connection with a peer, the router will compare their
holdtime values and uses the smaller time as the negotiated holdtime. If the negotiation
result is 0, the router will not send Keepalive message and will not detect whether the
holdtime expires.
Perform the following configuration in BGP view.
Table 6-33 Configure BGP timers
Configure BGP timers
Restore the default timer value
By default, the interval of sending keepalive is 60 seconds. The holdtime value is 180
seconds.
The reasonable maximum interval of sending Keepalive is one third of the holdtime
value. The interval of sending Keepalive cannot be less than 1 second. As a result, if
the holdtime is not 0 seconds, the minimum holdtime value is 3 seconds.
6.2.12 Configuring the Local Preference
When BGP select routes, it will select the route of the highest local preference.
Perform the following configuration in BGP view.
Table 6-34 Configure the local preference
Configure the local preference
Restore the default local preference
The local preference is transmitted only when the IBGP peers exchange the update
packets and it will not be transmitted beyond the local AS.
By default, the local preference is 100.
Operation
Operation
Command
timer keep-alive
holdtime-interval
undo timer
default local-preference value
undo default local-preference
6-20
Chapter 6 BGP Configuration
keepalive-interval
Command
hold