MPLS and RSVP
7450 ESS MPLS Guide Page 117
5. The signaled CT, setup priority and holding priority of a detour LSP matches those of the
primary LSP path it is associated with.
6. The operator can also configure the setup and holding priorities for each LSP path.
7. An LSP which does not have the CT explicitly configured will behave like a CT0 LSP
when Diff-Serv is enabled.
If the operator configured a combination of a CT and a setup priority and/or a combination of a CT
and a holding priority for an LSP path that are not supported by the user-defined TE classes, the
LSP path will be kept in a down state and error code will be shown within the show command
output for the LSP path.
Diff-Serv TE LSP Class Type Change under Failure
An option to configure a main Class Type (CT) and a backup CT for the primary path of a Diff-
Serv TE LSP is provided. The main CT is used under normal operating conditions, for example,
when the LSP is established the first time and when it gets re-optimized due to timer based or
manual re-signal. The backup CT is used when the LSP retries under failure.
The use of backup Class Type (CT) by an LSP is enabled by executing the
config>router>mpls>lsp>primary>backup-class-type ct-number command at the LSP primary
path level.
When this option is enabled, the LSP will use the CT configured using the following commands
(whichever is inherited at the primary path level) as the main CT:
• config>router>mpls>lsp>class-type ct-number
• config>router>mpls>lsp>primary>class-type ct-number
The main CT is used at initial establishment and during a manual or a timer based re-signal Make-
Before-Break (MBB) of the LSP primary path. The backup CT is used temporarily to signal the
LSP primary path when it fails and goes into retry.
Note that any valid values may be entered for the backup CT and main CT, but they cannot be the
same. No check is performed to make sure that the backup CT is a lower CT in Diff-Serv Russian-
Doll Model (RDM) admission control context.
The secondary paths of the same LSP are always signaled using the main CT as in existing
implementation.
LSP Primary Path Retry Procedures
This feature behaves according to the following procedures.
To Next Page
Loading...
