Configuring Cooperation Of Rsvp-Te And Bfd; Tuning Cr-Lsp Setup; Configuring The Tie Breaker In Cspf - HP HSR6800 Configuration Manual

Step
6. Set the RSVP-TE GR
recovery timer.
7. Enter interface view of MPLS
TE link.
8. 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:
Step
1. Enter system view.
2. Enter the view of an MPLS
RSVP-TE enabled interface.
3. 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.
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.

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:
Step
1. Enter system view.
2. Enter MPLS view.
Command
mpls rsvp-te timer
graceful-restart recovery
recovery-time
interface interface-type
interface-number
mpls rsvp-te hello
Command
system-view
interface interface-type
interface-number
mpls rsvp-te bfd enable
Command
system-view
mpls
63
Remarks
Optional.
300 seconds by default.
N/A
Disabled by default.
Remarks
N/A
N/A
Disabled by default.
Remarks
N/A
N/A