RSVP-TE Global Tasks

Typically, you do not configure anything for RSVP-TE at the global level, but you can perform the following optional tasks.

(Optional) Enable RSVP-TE. Any RSVP-TE–related command creates RSVP-TE implicitly, negating the need to issue this command.host1(config)#mpls rsvp
(Optional) Configure a global RSVP-TE profile that specifies the timeout period in milliseconds between generation of RSVP refresh messages, the number of refresh messages that can be lost before the PATH or RESV state is ended, or both.host1(config)#mpls rsvp interface profile rsvp4 host1(config-rsvp)#refresh-period 60000 host1(config-rsvp)#cleanup-timeout-factor 9
(Optional) Configure retry timer options globally (to apply to all tunnels) to set up an LSP after a setup failure (a failure other than one due to no available route). Specify the number of attempts to be made to set up an RSVP-TE tunnel or the interval in seconds between attempts.host1(config)#mpls lsp retries 35 host1(config)#mpls lsp retry-time 55
(Optional) Configure retry timer options globally (to apply to all tunnels) to set up an LSP after a failure due to no available route. Specify the number of attempts to be made to set up an RSVP-TE tunnel or the interval in seconds between attempts.host1(config)#mpls lsp no-route retries 3200 host1(config)#mpls lsp no-route retry-time 45
(Optional) Configure the interval at which the bandwidth values are flooded.host1(config)#mpls traffic-eng link-management timers periodic-flooding 10

(Optional) Configure reoptimization—the frequency at which MPLS searches for better paths for existing tunnels.

Note: Low timer values lead to frequent reoptimization of LSPs, which is undesirable for the following reasons:

Frequent changes to the LSPs increases packet loss.
Frequent reoptimization increases the load on the router, especially when the router acts as the LSP head end. The load is particularly noticeable in a scaled network, resulting in high CPU utilization on the router.



host1(config)#mpls reoptimize timers frequency
180

You can also force an immediate search for better paths for all existing LSPs.



host1#mpls reoptimize

(Optional) Enable refresh reduction and message bundling.host1(config)#mpls rsvp refresh-reduction host1(config)#mpls rsvp message-bundling
(Optional) Configure the egress router to advertise the explicit null label.host1(config)#mpls rsvp egress-label explicit-null