Tuning Cr-Lsp Setup; Configuration Prerequisites; Configuration Procedure - HP 12500 Series Configuration Manual

To do...
Enable RSVP hello extension for the
interface
Configuring Cooperation of RSVP-TE and BFD
On an MPLS TE network, if a link between neighboring LSRs fails, the corresponding MPLS TE tunnel will
fail to forward packets. MPLS TE itself cannot detect a link failure in time. To address this issue, you can
enable Bidirectional Forwarding Detection (BFD) for RSVP-TE on the two peers of an RSVP-TE tunnel. Then,
MPLS TE can be quickly aware of link failures between the peers, making sure that data can be switched
from the main path to the backup path.
To configure BFD for an RSVP-TE-enabled interface:
To do...
Enter system view
Enter the view of an MPLS RSVP-TE
enabled interface
Enable BFD on the RSVP-TE
enabled interface

Tuning CR-LSP setup

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.

Configuration prerequisites

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 (RSVP-TE). Before performing them, be aware of
each configuration objective and its impact on your system.

Configuration procedure

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-breaking methods, in the descending order of selection priority,
include: selecting a path with the lowest bandwidth usage ratio (the used bandwidth to the maximum
reservable link bandwidth), selecting a path with the highest bandwidth usage ratio (the used bandwidth
to the maximum reserved link bandwidth), and selecting a path randomly.
To configure the CSPF tie-breaking method:
To do...
Enter system view
Enter MPLS view
Use the command...
mpls rsvp-te hello
Use the command...
system-view
interface interface-type
interface-number
mpls rsvp-te bfd enable
Use the command...
system-view
mpls
63
Remarks
Required
Disabled by default
Remarks
—
—
Required
Disabled by default
Remarks
––
––