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Configuring the keepalive interval and hold time
BGP sends keepalive messages at a specific interval to keep the BGP session between two routers.
If a router receives no keepalive or update message from a peer within the hold time, it tears down the
session.
You can configure the keepalive interval and hold time globally or for a specific peer or peer group. The
individual settings take precedence over the global settings.
The actual keepalive interval and hold time are determined as follows:
•
If the hold time settings on the local and peer routers are different, the smaller setting is used. If the
hold time is 0, BGP does not send keepalive messages to its peers and never tears down the
session.
•
If the keepalive interval is 0 and the negotiated hold time is not 0, the actual keepalive interval
equals 1/3 of the hold time. If the keepalive interval is not 0, the actual keepalive interval is the
smaller one between 1/3 of the hold time and the keepalive interval.
To configure the keepalive interval and hold time (IPv4 unicast/multicast address family):
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP view or BGP-VPN
instance view.
•
Enter BGP view:
bgp
as-number
•
Enter BGP-VPN instance view:
a.
bgp
as-number
b.
ip vpn-instance
vpn-instance-name
N/A
3.
Configure the keepalive
interval and hold time.
•
Configure the global keepalive
interval and hold time:
timer keepalive
keepalive
hold
holdtime
•
Configure the keepalive
interval and hold time for a
peer or peer group:
peer
{
group-name
|
ip-address
}
timer
keepalive
keepalive
hold
holdtime
Use either method.
By default, the keepalive interval is
60 seconds, and hold time is 180
seconds.
The
timer
command takes effect for
new BGP sessions and does not
affect existing sessions.
The timers configured with the
timer
and
peer timer
commands do
not take effect until a session is
reestablished (for example, a
session is reset).
To configure the keepalive interval and hold time (IPv6 unicast/multicast address family):
Step Command
Remarks
1.
Enter system view.
system-view
N/A
