Ref: http://www.cisco.com/en/US/docs/ios/12_1t/12_1t3/feature/guide/rsvp_llq.html

  • Admission Control Combined with Low Latency Queueing
  • LLQ provides a means to forward voice traffic with strict priority
  • The LLQ is not supported on any tunnels.
  • RSVP support for LLQ on Frame Relay permanent virtual circuits (PVCs) and Asynchronous Transfer Mode (ATM) PVCs is currently not available. Support is planned for future releases.


•RFC 2205 (Resource Reservation Protocol)
•RFC 2210 (RSVP with IETF Integrated Services)
•RFC 2211 (Controlled-Load Network Element Service)
•RFC 2212 (Specification of Guaranteed Quality of Service)
•RFC 2215 (General Characterization Parameters for Integrated Service Network Elements)

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