R2511-HP MSR Router Series MPLS Configuration Guide(V5)

343
Ste
p
Command Remarks
2. Enter MPLS view.
mpls N/A
3. Enable global RSVP hello
extension.
mpls rsvp-te hello Disabled by default.
4. Enable MPLS RSVP-TE GR.
mpls rsvp-te graceful-restart Disabled by default.
5. Set the RSVP-TE GR restart
timer.
mpls rsvp-te timer graceful-restart
restart restart-time
Optional.
120 seconds by default.
6. Set the RSVP-TE GR recovery
timer.
mpls rsvp-te timer graceful-restart
recovery recovery-time
Optional.
300 seconds by default.
7. Enter interface view of MPLS
TE link.
interface interface-type
interface-number
N/A
8. Enable RSVP hello extension
for the interface.
mpls rsvp-te hello
Disabled by default.
Configuring BFD for RSVP-TE
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 primary path to the backup path.
To configure BFD for an RSVP-TE-enabled interface:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter the view of an MPLS
RSVP-TE enabled interface.
interface interface-type
interface-number
N/A
3. Enable BFD on the RSVP-TE
enabled interface.
mpls rsvp-te bfd enable Disabled by default.
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