From: Georg Pauwen (pauwen@hotmail.com)
Date: Wed Nov 10 2004 - 12:50:26 GMT-3
Hello Chalermchai,
for speeds below 650kbps, the Bc defaults to 1/8 of the configured CIR. For
speeds above 650kbps, the Bc defaults to 1/16 of the configured CIR.
Check this link to a very excellent explanation from Internetwork Experts
(slide 7 talks about the various defaults for the Bc).
http://www.internetworkexpert.com/resources/01700368.htm
Regards,
Georg
>From: "Hoonpongsimanont, Chalermchai"
><chalermchai.hoonpongsimanont@atosorigin.com>
>Reply-To: "Hoonpongsimanont, Chalermchai"
><chalermchai.hoonpongsimanont@atosorigin.com>
>To: "'Group Study'" <ccielab@groupstudy.com>
>Subject: FR Traffic Shaping Tc
>Date: Wed, 10 Nov 2004 14:23:06 +0700
>
>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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