Tuning And Optimizing Bgp Networks; Configuring The Bgp Keepalive Interval And Holdtime - HPE FlexNetwork HSR6800 Configuration Manual

Tuning and optimizing BGP networks

Configuring the BGP keepalive interval and holdtime

After establishing a BGP session, two routers send keepalive messages at the specified keepalive
interval to each other to keep the session.
If a router receives no keepalive or update message from the peer within the holdtime, it tears down
the session.
You can configure the keepalive interval and holdtime globally or for a specific peer or peer group.
The intervals configured for the specified peer or peer group takes higher priority. The actual
keepalive interval and holdtime depend on the following cases:
•
If the holdtime settings on the local and peer routers are different, the smaller one is used.
•
If the configured keepalive interval is 0 and the negotiated holdtime is not 0, the actual
keepalive interval equals one-third of the holdtime.
•
If the configured keepalive interval is not 0, the actual keepalive interval is the smaller one
between one third of the holdtime and the keepalive interval.
Follow these guidelines when you configure the BGP keepalive interval and holdtime:
•
The maximum keepalive interval should be one third of the holdtime and no less than one
second. The holdtime is no less than three seconds unless it is set to 0.
•
The intervals set with the peer timer command are preferred to those set with the timer
command.
•
If the router has established a BGP session with a peer, you must reset the BGP session to
validate the new set timers.
•
The timer command takes effect for only new BGP sessions.
•
After you set new intervals with the peer timer command, the existing BGP session is closed at
once, and a new session to the peer is negotiated by using the configured holdtime.
To configure BGP keepalive interval and holdtime:
Step
Enter system view.
1.
Enter BGP view or BGP-VPN
2.
instance view.
Configure BGP keepalive
3.
interval and holdtime.
Command
system-view
•
Enter BGP view:
bgp as-number
•
Enter BGP-VPN instance view:
a. bgp as-number
b. ipv4-family
vpn-instance
vpn-instance-name
•
Configure the global
keepalive interval and
holdtime:
timer keepalive keepalive
hold holdtime
•
Configure the keepalive
interval and holdtime for a
peer or peer group:
peer { group-name |
ip-address } timer keepalive
keepalive hold holdtime
219
Remarks
N/A
Use either method.
Optional.
By default, the keepalive
interval is 60 seconds, and
holdtime is 180 seconds.