Nokia 7705 - Page 206

MPLS and RSVP-TE
206
MPLS Guide
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3.24.2.1.7 Primary and Secondary Path Commands
primary
Syntax [no] primary path-name
Context config>router>mpls>lsp
Description This command specifies a preferred path for the LSP. This command is optional only if the
secondary path-name is included in the LSP definition. Only one primary path can be defined
for an LSP.
Some of the attributes of the LSP, such as the bandwidth and hop limit, can be optionally
specified as the attributes of the primary path. The attributes specified in the primary path-
name command override the comparable LSP attributes that are defined in the
config>router>mpls>lsp context.
The no form of this command deletes the association of this path-name from the lsp lsp-
name. All configurations specific to this primary path, such as record, bandwidth, and hop
limit, are deleted. The primary path must be shut down first in order to delete it. The no
primary command will not result in any action except a warning message on the console
indicating that the primary path is administratively up.
Default n/a
Parameters path-name — specifies the case-sensitive alphanumeric name label for the LSP path, up
to 32 characters in length
secondary
Syntax [no] secondary path-name
Context config>router>mpls>lsp
Description This command specifies an alternative path that the LSP uses if the primary path is not
available. This command is optional and is not required if the config>router>mpls>lsp lsp-
name> primary path-name command is specified. After the switchover from the primary path
to the secondary path, the 7705 SAR software continuously tries to revert to the primary path.
The switch back to the primary path is based on the retry-timer interval.
Up to two secondary paths can be specified. Both secondary paths are considered equal, and
the first available path is used. The 7705 SAR software will not switch back between
secondary paths.
The 7705 SAR software starts signaling all non-standby secondary paths at the same time.
Retry counters are maintained for each unsuccessful attempt. Once the retry limit is reached
on a path, software will not attempt to signal the path and administratively shuts down the
path. The first successfully established path is made the active path for the LSP.