MPLS and RSVP-TE
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MPLS Guide
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3.4 RSVP-TE Signaling
RSVP-TE-based signaling provides a means to establish tunnels dynamically.
RSVP-TE uses the Downstream on Demand (DOD) label distribution mode, sending
PATH messages from the ingress LER node to the egress LER and RESV messages
in the reverse direction. DOD label distribution is a router’s response to an explicit
request from another router for label binding information. The DOD mode is in
contrast to LDP on the 7705 SAR, which uses the Downstream Unsolicited (DU)
label distribution mode for both PWs and LSPs. A router in DU mode will distribute
label bindings to another router that has not explicitly requested the label bindings.
RSVP-TE signaling is supported when the 7705 SAR is deployed as an LER and as
an LSR. When used as an LER, the 7705 SAR uses RSVP-TE signaling to set up
constrained paths because only the LER knows all the constraints imposed on the
LSP. When used as an LSR, the 7705 SAR uses RSVP-TE to interpret the
RSVP-TE messages (including all the constraints).
With RSVP-TE, users can choose which services and PWs may use a particular
LSP. One-to-one or many-to-one scenarios for binding PWs to RSVP-TE LSPs is
supported, which is similar to binding PWs to static LSPs. Furthermore, each
RSVP-TE LSP can be configured with its own set of attributes and constraints.
3.4.1 General Attributes of RSVP-TE
The following general attributes of RSVP-TE on the 7705 SAR are supported:
• Bidirectional Forwarding Detection
• Timers
• LSP Resignal Limit
• RSVP-TE Message Pacing
• RSVP-TE Overhead Refresh Reduction
• RSVP-TE Reservation Styles
• Implicit Null Label
• RSVP-TE Entropy Labels
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