From: Nick Shah (nshah@xxxxxxxxxxxxxx)
Date: Wed Jun 12 2002 - 21:53:16 GMT-3
Michael,I always refer to this formula, when I am in doubt, about FRTS .
frame relay mincir
The actual guaranteed rate obtained from service provider in bps. This value
should be the minimum rate you should drop to in the event of congestion
(dropping below this rate implies you are not getting the bandwidth you are
paying for). In certain cases (listed above) the mincir and cir values must
be the same. The value of mincir is half of the CIR value in bps by default.
frame relay bc
The amount of data to send per each Tc interval in bits. Ideally for data
PVCs Bc = CIR/8 so that Tc = 125msec. If we are doing voice on the PVC, then
Bc = CIR/100 is preferable, so that the interval Tc = 10msec (as voice
packets cannot tolerate a longer delay). The value of Bc by default is the
CIR in bits.
frame relay be
The amount of excess data allowed to be sent during first Tc interval in
bits once credit is built up. Configure Be only if the Frame Relay CIR value
is less than the AR. For PVCs carrying voice packets, the Be must be set to
zero to ensure best possible voice quality. The router only bursts (Be) when
there are tokens in the token bucket. The token bucket does not accrue
tokens unless the amount of traffic being sent out is less than the CIR. The
router can only burst for the first Tc, after which the token bucket is
empty. The value of Be by default is zero bits.
So in your case, Bc = 32/8 = 4k, (considering Tc = 125ms, which is true for
data traffic, for voice it will be 10ms)
Be should be provided, if not, consider 0. Also follow the rule of
"configure Be only if CIR < AR". The *unofficial* standard is Bc * 2.
rgds
Nick
----- Original Message -----
From: "Michael Popovich" <m.popovich@mchsi.com>
To: "CCIE GROUPSTUDY" <ccielab@groupstudy.com>
Sent: Thursday, June 13, 2002 10:06 AM
Subject: FRTS Question
> If given the requirement to set the cir to 32K. How would you figure out
the
> correct values for the Bc and Be?
>
> TIA
>
> MP
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