Huawei AR1200 Series Configuration Manual - Mpls page 43

Huawei AR1200 Series Enterprise Routers
Configuration Guide - MPLS
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Issue 01 (2011-12-30)
If there is more than one LDP link between two LSRs, the values of the Keepalive
hold timers configured for the links must be the same. Different settings cause the
LDP sessions to be unstable.
CAUTION
Changing the value of a Keepalive hold timer causes the reestablishment of related
LDP sessions.
Configure an Exponential backoff timer.
1. Run:
system-view
The system view is displayed.
2. Run:
mpls
The MPLS view is displayed.
3. Run:
quit
Return to the system view.
4. Run:
mpls ldp
The MPLS-LDP view is displayed.
5. Run:
backoff timer init max
The Exponential backoff timer is configured. The following parameters can be
configured:
– init: specifies the initial value of the Exponential backoff timer. The value is an
integer ranging from 5 to 2147483, in seconds. The default value is 15.
– max: specifies the maximum value of the Exponential backoff timer. The value is
an integer ranging from 5 to 2147483, in seconds. The default value is 120.
NOTE
Setting the initial value of the Exponential backoff timer to be greater than or equal to 15s and
the maximum value to be greater than or equal to 120s is recommended.
The backoff timer command can be used to change the interval between attempts to
set up a session. Its usage is as follows:
– When a device is being upgraded, increase the initial and maximum values to set
a large interval between attempts to set up a session.
– When a device that is transmitting services is prone to intermittent interruptions,
reduce the initial and maximum values to set a small interval between attempts to
set up a session.
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