R0106-HP MSR Router Series MPLS Command Reference(V7)

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forwarding for the traffic of primary CRLSP, and the occupied bandwidth is not fixed. Therefore, this type
of bypass tunnel cannot protect a primary CRLSP with the bandwidth 0 or a primary CRLSP whose
bandwidth exceeds the protected bandwidth.
If no CT is specified, CRLSPs of all CTs can use the bypass tunnel.
The bandwidth value specified is used only for calculating and determining the bandwidth protection
relationship between a primary CRLSP and a bypass tunnel. The bandwidth is not reserved on the bypass
tunnel.
The specified bandwidth value must be less than the actual bandwidth of the bypass tunnel. Otherwise,
the bypass tunnel will be overwhelmed after FRR, and the protected tunnel might be torn down.
After an FRR, the primary CRLSP will be down if you modify the bandwidth that the bypass tunnel can
protect and your modification results in one of the following:
• The CT type changes.
• The bypass tunnel cannot protect adequate bandwidth as configured.
• FRR protection type (whether or not to provide bandwidth protection for the primary CRLSP)
changes.
After you configure the mpls te backup bandwidth command for a tunnel, the record route flag is
automatically set for the tunnel, regardless of whether the mpls te record-route command is configured.
Examples
# Configure Tunnel 0 to provide protection for CRLSPs of CT 0 without constraining the protected
bandwidth. Configure Tunnel 1 to provide protection for CRLSPs of CT 1 and protect up to 1000 kbps
bandwidth.
<Sysname> system-view
[Sysname] interface tunnel 0 mode mpls-te
[Sysname-Tunnel0] mpls te backup bandwidth ct0 un-limited
[Sysname-Tunnel0] quit
[Sysname] interface tunnel 1
[Sysname-Tunnel1] mpls te backup bandwidth ct1 1000
Related commands
• display mpls te tunnel-interface
• mpls te fast-reroute
mpls te backup-path
Use mpls te backup-path to specify a path for the backup CRLSP and set the preference of the path.
Use undo mpls te backup-path to delete the specified path.
Syntax
mpls te backup-path preference value { dynamic | explicit-path path-name } [ no-cspf ]
undo mpls te backup-path preference value
Default
MPLS TE uses the dynamically calculated path to establish the backup CRLSP.
Views
Tunnel interface view