Here's a sample section of a map-class config that I wrote up for VoIP FRTS,
complete with running commentary on the commands (including min CIR and
CIR). Scott Keagy's Integrating Voice and Data Networks (Cisco Press) was
great for frame relay traffic shaping.
map-class frame-relay theframeclass
{Do not use the command frame-relay fragment , as this is recommended to
reduce serialization delay for speeds of 768K or less.}
frame-relay mincir out 1536 {This is the provisioned CIR assigned by
service provider}
frame-relay cir out 1536 {Technically, this is higher than min CIR, since
traffic can be sustained at a higher rate thats CIR. But make CIR=Minimum
CIR here.}
frame-relay be out 0 {Set excess burst to 0 since we dont want to burst
over CIR for voice.}
frame-relay bc out 15360 {Set committed burst, which is 15360 bits, or
1/100 of CIR (1536K CIR). This makes serialization delay=10ms, a reasonable
value. Serialization Delay = frame size (bits) / link bandwidth (bps).}
no frame-relay adaptive-shaping {Turn off because we do not want the frame
relay circuit to throttle back. If the router receives BECNs on the
interface, the router would start to throttle back to the Min CIR value.
This is why we turn it off and lock the Min CIR to the actual CIR value.}
service-policy output thepolicy {attach policy here for the queuing. If you
dont put a policy here, frame relay traffic shaping defaults to FIFO. In
that case, you would override with the preferred frame-relay fair-queue.}
- Jennifer Mellone
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