Advanced Mpls/Rsvp Features; Extending Rsvp Lsp To Use Loopback Interfaces Other Than Router-Id; Lsp Path Change - Alcatel-Lucent 7450 Manual

Advanced MPLS/RSVP Features

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Extending RSVP LSP to use Loopback Interfaces Other Than
router-id
It is possible to configure the address of a loopback interface, other than the router-id, as the
destination of an RSVP LSP, or a P2MP S2L sub-LSP. In the case of a CSPF LSP, CSPF searches
for the best path that matches the constraints across all areas and levels of the IGP where this
address is reachable. If the address is the router-id of the destination node, then CSPF selects the
best path across all areas and levels of the IGP for that router-id; regardless of which area and level
the router-id is reachable as an interface.
In addition, the user can now configure the address of a loopback interface, other than the router-
id, as a hop in the LSP path hop definition. If the hop is strict and corresponds to the router-id of
the node, the CSPF path can use any TE enabled link to the downstream node, based on best cost.
If the hop is strict and does not correspond to the router-id of the node, then CSPF will fail.

LSP Path Change

The tools perform router mpls update-path {lsp lsp-name path current-path-name new-path
new-path-name} command instructs MPLS to replace the path of the primary or secondary LSP.
The primary or secondary LSP path is indirectly identified via the current-path-name value. In
existing implementation, the same path name cannot be used more than once in a given LSP name.
This command is also supported on an SNMP interface.
This command applies to both CSPF LSP and to a non-CSPF LSP. However, it will only be
honored when the specified current-path-name has the adaptive option enabled. The adaptive
option can be enabled the LSP level or at the path level.
7450 ESS MPLS Guide
Extending RSVP LSP to use Loopback Interfaces Other Than router-id on page 123
LSP Path Change on page 123
RSVP-TE LSP Shortcut for IGP Resolution on page 127
Shared Risk Link Groups on page 135
TE Graceful Shutdown on page 141
Soft Pre-emption of Diff-Serv RSVP LSP on page 141
Least-Fill Bandwidth Rule in CSPF ECMP Selection on page 142
MPLS and RSVP
Page 123