Tuning And Optimizing Bgp Networks; Configuring The Bgp Keepalive Interval And Holdtime - HP MSR Series Configuration Manual

Step
2. Enter BGP view or BGP-VPN
instance view.
3. Configure BGP to ignore the
first AS number of EBGP route
updates.

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
1. Enter system view.
2. Enter BGP view or BGP-VPN
instance view.
Command
bgp as-number
ignore-first-as
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
201
Remarks
N/A
By default, BGP checks the first AS
number of EBGP route updates.
Remarks
N/A
Use either method.