Enabling Synchronization Between Ldp And Static Routes; Optional) Setting A Hold-Down Timer - Huawei AR1200 Series Configuration Manual

Huawei AR1200 Series Enterprise Routers
Configuration Guide - MPLS
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2.12.2 Enabling Synchronization Between LDP and Static Routes

On an MPLS network with primary and backup LSPs, LSRs establish LSPs based on static
routes. By enabling synchronization between LDP and static routes on both ends of the two
links, you can avoid MPLS traffic interruption.
Context
With synchronization between LDP and static routes, you can switch traffic from the faulty
primary link to the backup link by suppressing the activation of static routes and delay traffic
switchback to the primary link, ensuring that LDP is synchronous with static routes.
Perform the following steps on devices on both ends of the primary and backup links:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
ip route-static ip-address { mask | mask-length } interface-type interface-number
[ nexthop-address ] [ preference preference | tag tag ]
text ]
Synchronization between LDP and static routes is configured.
By default, synchronization between LDP and static routes is not enabled.
----End

2.12.3 (Optional) Setting a Hold-down Timer

When the primary link recovers, a static route does not become active immediately. Instead, the
static route becomes active only when an LDP session is established before the Hold-down timer
expires. Then traffic is switched back to the primary link.
Context
After a Hold-down timer is set on an interface, the static route enabled with synchronization
between LDP and static routes becomes inactive temporarily and waits for an LDP session to
be established before the Hold-down timer expires. This implements synchronization between
Issue 01 (2012-04-20)
Data
Type and number of the outbound interface of a static route
Time during which a static route waits for an LDP session to be established, that is,
time of the Hold-down timer (optional)
NOTE
Only the static route with a specified outbound interface can be configured with synchronization between
LDP and static routes.
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