BGP timers are configured.
The proper maximum interval at which Keepalive messages are sent is one third the
holdtime and is not less than one second. If the holdtime is not set to 0, it is 3s at least.
By default, the keepalive-time value is 60s and the hold-time value is 180s.
NOTE
Setting the Keepalive time to 20s is recommended. If the Keepalive time is smaller than 20s,
sessions between peers may be closed.
When setting values of keepalive-time and hold-time, note the following points:
– The keepalive-time and hold-time values cannot be both set to 0. Otherwise, the
BGP timers become invalid, meaning that BGP will not send Keepalive messages
to detect connection status.
– The hold-time value cannot be much greater than the keepalive-time value. For
example, keepalive-time cannot be set to 1 while hold-time is set to 65535. If the
hold-time value is too large, BGP cannot detect connection status in time.
After a connection is established between peers, the keepalive-time and hold-time
values are negotiated by the peers. The smaller one of the hold-time values carried by
Open messages of both peers is taken as the hold-time value. The smaller of one third
of the hold-time value and the locally configured keepalive-time value is taken as the
keepalive-time value.
l Configure timers for a specific peer or peer group.
Perform the following steps on a BGP switch:
1. Run:
system-view
The system view is displayed.
2. Run:
bgp as-number
The BGP view is displayed.
3. Run:
peer { ipv4-address | group-name } timer keepalive keepalive-time hold
hold-time
The Keepalive and hold timer values are set for a specific peer or peer group.
For information about the relationship between the keepalive-time and hold-time
values, see Configure BGP timers for all peers or peer groups.
NOTE
Setting the Keepalive time to 20s is recommended. If the Keepalive time is smaller than 20s,
sessions between peers may be closed.
Timers set for a specific peer or peer group takes precedence over timers set for all
peers or peer groups.
----End
7.12.4 Configuring a MinRouteAdvertisementIntervalTimer
A proper MinRouteAdvertisementIntervalTimer can be configured to suppress frequent route
changes, improving BGP network stability.
S6700 Series Ethernet Switches
Configuration Guide - IP Routing 7 BGP Configuration
Issue 01 (2012-03-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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