Tuning Cr-Lsp Setup; Configuration Prerequisites; Configuration Procedure - 3Com MSR 50 Series Configuration Manual

1370 C 77: MPLS TE C
HAPTER

Tuning CR-LSP Setup

Configuration
Prerequisites

Configuration Procedure

ONFIGURATION
To do...
Enable global RSVP hello
extension
Enable MPLS RSVP-TE GR
Set the RSVP-TE GR restart
timer
Set the RSVP-TE GR recovery
timer
Enter interface view of MPLS
TE link
Enable RSVP hello extension
for the interface
A CR-LSP is established through the signaling protocol based on the path
calculated by CSPF using TEDB and constraints. MPLS TE can affect CSPF
calculation in many ways to determine the path that a CR-LSP can traverse.
The configuration tasks described in this section are about CSPF of MPLS TE. They
must be used in conjunction with CSPF and the dynamic signal protocol (CR-LDP
or RSVP-TE). Before performing them, be aware of each configuration objective
and its impact on your system.
Tuning CR-LSP setup involves these tasks:
"Configuring the tie breaker in CSPF" on page 1370
■
"Configuring route pinning" on page 1371
■
"Configuring administrative group and affinity attribute" on page 1371
■
"Configuring CR-LSP reoptimization" on page 1372
■
Configuring the tie breaker in CSPF
CSPF only calculates the shortest path to the end of a tunnel. If multiple paths are
present with the same metric, only one of them is selected. Tie breakers include
largest currently available bandwidth, least currently available bandwidth, or
random selection.
Follow these steps to configure CSPF tie-breaking method:
To do...
Enter system view
Enter MPLS view
Configure the tie breaker used
when multiple paths are present in
a CSPF calculation on the current
node
Use command to...
mpls rsvp-te hello
mpls rsvp-te
graceful-restart
mpls rsvp-te timer
graceful-restart restart
restart-time
mpls rsvp-te timer
graceful-restart recovery
recovery-time
interface interface-type
interface-number
mpls rsvp-te hello
Use command to...
system-view
mpls
mpls te tie-breaking
{ least-fill | most-fill |
random }
Remarks
Required
Disabled by default
Required
Disabled by default
Optional
120 seconds by default
Optional
300 seconds by default
-
Required
Disabled by default
Remarks
--
--
Optional
The random keyword
applies by default.