Alcatel-Lucent 7450 Manual page 274

MPLS Commands
order to delete it. The no secondary path-name command will not result in any action except a
warning message on the console indicating that the secondary path is administratively up.
Default none
Parameters path-name — The case-sensitive alphanumeric name label for the LSP path up to 32 characters in
adaptive
Syntax [no] adaptive
Context config>router>mpls>lsp>primary
config>router>mpls>lsp>secondary
Description This command enables the make-before-break functionality for an LSP or a primary or secondary
LSP path. When enabled for the LSP, make-before-break will be performed for primary path and all
the secondary paths of the LSP.
Default adaptive
backup-class-type
Syntax backup-class-type ct-number
no backup-class-type
Context config>router>mpls>lsp>primary
Description This command enables the use of the Diff-Serv backup Class-Type (CT), instead of the Diff-Serv
main CT, to signal the LSP primary path when it fails and goes into retry. The Diff-Serv main CT is
configured at the LSP level or at the primary path level using the following commands:
When a LSP primary path retries due a failure, for example, it fails after being in the UP state, or
undergoes any type of Make-Before-Break (MBB), MPLS will retry a new path for the LSP using the
main CT. If the first attempt failed, the head-end node performs subsequent retries using the backup
CT. This procedure must be followed regardless if the currently used CT by this path is the main or
backup CT. This applies to both CSPF and non-CSPF LSPs.
The triggers for using the backup CT after the first retry attempt are:
Page 274
length.
config>router>mpls>lsp>class-type ct-number
config>router>mpls>lsp>primary>class-type ct-number
1. A local interface failure or a control plane failure (hello timeout etc.).
1. Receipt of a PathErr message with a notification of a FRR protection becoming active down-
stream and/or Receipt of a Resv message with a 'Local-Protection-In-Use' flag set. This
invokes the FRR Global Revertive MBB.
1. Receipt of a PathErr message with error code=25 ("Notify") and sub-code=7 ("Local link
maintenance required") or a sub-code=8 ("Local node maintenance required"). This invokes
the TE Graceful Shutdown MBB.
7450 ESS MPLS Guide