Rsvp igp synchronization – Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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RSVP IGP synchronization
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Enabling both RSVP refresh reduction extensions in a single step
Bundle messages and summary refresh are disabled by default for all interfaces. The user can
enable both extensions with default parameters on an interface by using commands such as the
following.
Brocade(config)# router mpls
Brocade(config-mpls)# mpls-interface eth 3/13
Brocade(config-mpls-if-e1000-3/13)# rsvp-refresh-reduction all
The previous commands enable bundle messages and summary refresh on interface 3/13 with
the default bundle-send-delay setting of 40 milliseconds (or the previously configured value, when
one has been set for this interface) and the refresh interval set for RSVP at the global level.
Syntax: rsvp-refresh-reduction all
When the RSVP neighbor does not support refresh reduction, the interface does not send bundled
messages or summary refresh messages, even though the extensions are enabled. Use the [no]
version of the command to manually disable both extensions on this interface.
Displaying refresh reduction information for an interface
The user can display RSVP refresh reduction settings for an interface by using the following
command at any level of the CLI.
Brocade# show mpls rsvp interface
For detailed information about this command and what it displays, refer to
.
RSVP IGP synchronization
The RSVP IGP synchronization feature enables RSVP to react to an IGP neighbor down event. This
feature can help improve the convergence time of RSVP and reduce the latency in removing the
resource reservations, thereby improving the overall network efficiency.
When an IGP protocol declares a neighbor down, because hello packets are no longer being
received, RSVP brings down all the associated LSPs and sessions that are passing through the
down neighbor. However, the IGP protocols and RSVP still act independently when bringing a
neighbor up.
RSVP sessions are maintained until either the router stops receiving IGP hello packets or the RSVP
Path and Resv messages time out or RSVP states are explicitly torn down by the ingress or egress.
Configuring a short time for the IS-IS or OSPF hello timers allows these protocols to detect node
failures quickly. Also, configuring BFD for IGP interface provides sub-second neighbor down
detection time. When quick discovery of a failed neighbor is needed, short IGP (OSPF or IS-IS) hello
timers could be configured, or BFD could be enabled on IGP interfaces.