Nokia 7705 SAR-W Series Manual page 220

MPLS and RSVP-TE
Description This command initiates a graceful shutdown of the specified RSVP interface (referred to as
a maintenance interface) or all RSVP interfaces on the node (referred to as a maintenance
node). When this command is executed, the node performs the following operations in no
specific order.
A PathErr message with an error sub-code of "Local Maintenance on TE Link required" is
generated for each LSP that is in transit at this node and is using a maintenance interface as
its outgoing interface. A PathErr message with the error code "Local node maintenance
required" is generated if all interfaces are affected.
A single make-before-break attempt is performed for all adaptive CSPF LSPs that originate
on the node and whose paths make use of the maintenance interfaces listed in the PathErr
message. If an alternative path for an affected LSP is not found, the LSP is maintained on its
current path. The maintenance node also tears down and resignals any bypass or detour LSP
that uses the maintenance interfaces as soon as they are not active. The maintenance node
floods an IGP TE LSA/LSP containing a Link TLV for the links under graceful shutdown with
the Traffic Engineering metric set to 0xffffffff and the Unreserved Bandwidth parameter set to
zero (0).
Upon receipt of the PathErr message, an intermediate LSR tears down and resignals any
bypass LSP whose path makes use of the listed maintenance interfaces as soon as no
associations with a protected LSP are active. The node does not take any action on a detour
LSP whose path makes use of the listed maintenance interfaces.
Upon receipt of the PathErr message, a head-end LER performs a single make-before-break
attempt on the affected adaptive CSPF LSP. If an alternative path is not found, the LSP is
maintained on its current path.
A node does not take any action on the paths of the following originating LSPs after receiving
the PathErr message:
Upon receipt of the updated IPG TE LSA/LSP for the maintenance interfaces, the head-end
LER updates the TE database. This information will be used at the next scheduled CSPF
computation for any LSP whose path might traverse any of the maintenance interfaces.
The no form of the command disables the graceful shutdown operation at the RSVP interface
level or at the RSVP level. The configured TE parameters of the maintenance links are
restored and the maintenance node floods the links.
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• an adaptive CSPF LSP for which the PathErr indicates a node address in the address
list and the node corresponds to the destination of the LSP. In this case, there are no
alternative paths that can be found.
• an adaptive CSPF LSP whose path has explicit hops defined using the listed
maintenance interfaces or node
• a CSPF LSP that has the adaptive option disabled and whose current path is over the
listed maintenance interfaces in the PathErr message. These are not subject to make-
before-break.
• a non-CSPF LSP whose current path is over the listed maintenance interfaces in the
PathErr message
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MPLS Guide
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