FR Traffic Shaping Tc

From: "Hoonpongsimanont
Date: Wed Nov 10 2004 - 04:23:06 GMT-3

Hi all,

I am confused with Frame Relay Traffic Shaping Tc interval. I think router
will automatically calculate Tc from configured CIR and Bc by

Bc = CIR * Tc

This is not working as expected on my router.

Rack1R5#show traffic-shape serial0/0.35

Interface Se0/0.35
       Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
503 768000 6048 96000 0 63 6048 -

I configured target rate of 768000, Bc of 96000, therefore I expected to see
Tc of 96000/768000 = 1/8 second = 125 ms. But on my router, Tc is 64 ms.

It's working fine on another subinterface.

Rack1R5#show traffic-shape serial0/0.54

Interface Se0/0.54
       Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes)
Active
504 768000 960 7680 0 10 960 -
 
Could this be a software bug? I'm using 12.2(15)T14.
Thanks in advance,

Cheers,
David

Here's configuration.

!
 class-map match-all voice
  match dscp cs5
!
!
 policy-map voice-go-first
  class voice
   priority 256
  class class-default
   fair-queue
 policy-map mark-default
  class class-default
   set dscp cs1
!
!
interface Serial0/0
 no ip address
 encapsulation frame-relay
 frame-relay traffic-shaping
 no frame-relay inverse-arp
!
interface Serial0/0.35 point-to-point
 ip address 163.1.35.5 255.255.255.0
 ip router isis
 isis circuit-type level-2-only
 frame-relay interface-dlci 503
  class R3R5
!
interface Serial0/0.54 point-to-point
 ip address 163.1.54.5 255.255.255.0
 ip router isis
 ip pim dense-mode
 backup interface BRI0/0
 isis circuit-type level-2-only
 frame-relay de-group 1 504
 frame-relay interface-dlci 504
  class R4R5
!
!
map-class frame-relay R4R5
 frame-relay end-to-end keepalive mode request
 frame-relay cir 768000
 frame-relay bc 7680
 frame-relay be 0
 service-policy output voice-go-first
 frame-relay fragment 960
!
map-class frame-relay R3R5
 frame-relay cir 768000
 frame-relay bc 96000
 frame-relay be 0
 service-policy input mark-default

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