Associating Cr-Lsp Establishment With The Overload Setting - Huawei AR1200 Series Configuration Manual

Huawei AR1200 Series Enterprise Routers
Configuration Guide - MPLS
The TE tunnel is re-optimized immediately.
After configuring the timing re-optimization in the tunnel view, return to the user view and run
the mpls te reoptimization command to re-optimize the optimized tunnels immediately. Once
the re-optimization is performed, the timing re-optimization timer is reset and count time again.
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3.7.4 Associating CR-LSP Establishment with the Overload Setting

CR-LSP establishment can be associated with the overload setting. This association ensures that
CR-LSPs are established over paths excluding overloaded nodes.
Context
A node becomes overloaded in the following situations:
l
l
If there are overloaded nodes on an MPLS TE network, associate CR-LSP establishment with
the IS-IS overload setting to ensure that CR-LSPs are established over paths excluding
overloaded nodes. This configuration prevents overloaded nodes from being further burdened
and improves CR-LSP reliability.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
mpls
The MPLS view is displayed.
Step 3 Run:
mpls te path-selection overload
CR-LSP establishment is associated with the IS-IS overload setting. This association allows
CSPF to calculate paths excluding overloaded IS-IS nodes.
The mpls te path-selection overload command has the following influences on the CR-LSP
establishment:
l CSPF recalculates paths excluding overloaded nodes for established CR-LSPs.
Issue 01 (2012-04-20)
When the node is transmitting a large number of services and its system resources are
exhausted, the node marks itself overloaded.
When the node is transmitting a large number of services and its CPU is overburdened, an
administrator can run the set-overload command to mark the node overloaded.
NOTE
Before the association is configured, the mpls te cspf command must be run to enable CSPF and the mpls
te record-route command must be run to enable the route and label record.
Traffic travels through an existing CR-LSP before a new CR-LSP is established. After the new CR-LSP
is established, traffic switches to the new CR-LSP and the original CR-LSP is deleted. This traffic
switchover is performed based on the make-before-break mechanism. Traffic is not dropped during the
switchover.
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