Frame Relay Traffic Shapi ...
    21 January 08

    Frame Relay Traffic Shaping with GTS

    Posted byPetr Lapukhov

    As first and very basic option, you may use Generic Traffic Shaping to implement FRTS. This is a common technique, not unique to Frame-Relay, with the following properties:

    - Configured by using traffic-shape interface command
    - As with standard GTS, internal shaper queue is basic WFQ
    - Configured per inteface/subinteface (no PVC granularity)
    - GTS may adapt to BECNs & reflect FECNs (BECN received at any interface/subinteface PVC will cause shaper rate to throttle back to minCIR)
    - FECN reflection activates sending BECNs in responce to incoming FECN frames. Note, that FECN/BECN responce requires provider to mark frames with FECN/BECN bits
    - You can configure Fancy-Queueing (WFQ/PQ/CQ) at physical interface level with GTS.


    ! Physical Interface, fancy-queueing may apply here

    interface Serial 0/0/0:0
    no ip address
    encapsulation frame-relay

    ! Subinterface, apply GTS here

    interface Serial0/0/0:0.1 point-to-point
    ip address
    ! Shaping rate
    traffic-shape rate 512000
    ! "MinCIR", adapt to BECNs
    traffic-shape adaptive 256000
    ! Reflect FECNs as BECNs
    traffic-shape fecn-adapt
    frame-relay interface-dlci 112


    Rack1R1#show traffic-shape

    Interface Se0/0/0:0.1
    Access Target Byte Sustain Excess Interval Increment Adapt
    VC List Rate Limit bits/int bits/int (ms) (bytes) Active
    - 512000 3200 12800 12800 25 1600 BECN

    Rack1R1#show traffic-shape statistics
    Acc. Queue Packets Bytes Packets Bytes Shaping
    I/F List Depth Delayed Delayed Active
    Se0/0/0:0.1 0 157 10500 0 0 no

    Rack1R1#show traffic-shape queue
    Traffic queued in shaping queue on Serial0/0/0:0.1
    Queueing strategy: weighted fair
    Queueing Stats: 0/1000/64/0 (size/max total/threshold/drops)
    Conversations 0/0/32 (active/max active/max total)
    Reserved Conversations 0/0 (allocated/max allocated)
    Available Bandwidth 512 kilobits/sec

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