Cisco Cisco IOS Software Release 12.0(22)S
MPLS Traffic Engineering (TE)—Scalability Enhancements
Prerequisites for MPLS Traffic Engineering (TE)—Scalability Enhancements
2
Cisco IOS Releases: Multiple Releases (see the Feature Information Table)
Prerequisites for MPLS Traffic Engineering (TE)—Scalability
Enhancements
Enhancements
Your network must support the following Cisco IOS features before you enable MPLS traffic
engineering:
engineering:
•
MPLS
•
IP Cisco Express Forwarding
•
Intermediate System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF)
Restrictions for MPLS Traffic Engineering (TE)—Scalability
Enhancements
Enhancements
The number of tunnels that a particular platform can support can vary depending on:
•
The types of interfaces that the tunnels traverse
•
The manner in which the Resource Reservation Protocol (RSVP) message pacing feature is
configured
configured
Information About MPLS Traffic Engineering (TE)—Scalability
Enhancements
Enhancements
Scalability performance is improved for large numbers of traffic engineering tunnels, and includes the
following enhancements:
following enhancements:
•
Increase the number of traffic engineering tunnels a router can support when configured as a tunnel
headend and when configured as a tunnel midpoint
headend and when configured as a tunnel midpoint
•
Reduce the time required to establish large numbers of traffic engineering tunnels
The following sections describe user-observable scalability enhancements:
•
•
•
•
•
Pacing for RSVP Messages
A burst of RSVP traffic engineering signaling messages can overflow the input queue of a receiving
router, causing some messages to be dropped. Dropped messages cause a substantial delay in completing
label-switched path (LSP) signaling.
router, causing some messages to be dropped. Dropped messages cause a substantial delay in completing
label-switched path (LSP) signaling.