Lsp Resignal Limit; Rsvp-Te Message Pacing - Nokia 7705 SAR-W Series Manual

MPLS and RSVP-TE
3.4.1.3
When an LSP fails, an LER node tries to resignal it. The following limit can be
configured:
3.4.1.4
RSVP-TE message pacing provides a means to limit the overwhelming number of
RSVP-TE signaling messages that can occur in large MPLS networks during node
failures. RSVP-TE message pacing allows the messages to be sent in timed
intervals.
To protect nodes from receiving too many messages, the following message pacing
parameters can be configured:
Message pacing needs to be enabled on all the nodes in a network to ensure the
efficient operation of tier-1 nodes. Message pacing affects the number of RSVP-TE
messages that a particular node can generate, not the number of messages it can
receive. Therefore, each node must be paced at a rate that allows the most loaded
MPLS nodes to keep up with the number of messages they receive.
Note: Typically, a tier-1 node is an aggregator of tier-2 node transmissions, which is an
aggregator of tier-3 node transmissions. Tier-1 nodes are often installed at an MTSO, while
tier-3 nodes are often installed at cell sites.
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• retry-timer — the retry timer defines a period of time before a resignal attempt is
made after an LSP failure. This delay time protects network resources against
excessive signaling overhead.

LSP Resignal Limit

• retry-limit — the retry limit defines the number of resignaling attempts in order to
conserve the resources of the nodes in the network. There could be a serious
loss of capacity due to a link failure where an infinite number of retries generate
unnecessary message overhead.

RSVP-TE Message Pacing

• msg-pacing — message pacing can be enabled or disabled
• max-burst — maximum burst defines the number of RSVP-TE messages that
can be sent in the specified period of time
• period — period defines the interval of time used in conjunction with the max-
burst parameter to send message pacing RSVP-TE messages
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MPLS Guide
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