This is some information that I found that may help you...
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.
frame relay adaptive-shaping becn
Implies that the PVC adapts the rate of transmit in response to the BECNs
received. The behaviour is as below:
If the PVC receives any BECNs during the current time interval (it
doesn't matter if this is one or 1000) the transmit rate is decreased by 25
percent.
It continues to drop with each BECN (limit one drop per time interval)
until the traffic rate gets to the mincir (guaranteed rate) where it stops.
Once the traffic rate has decreased, it must allow 16 time intervals of
receiving no BECNs before starting to increase traffic again. The amount it
increases by
is the byte limit that shows up in the show frame pvc x output divided
by 16. This increase occurs only if traffic shaping is active. Thus, it
takes much longer
to get back to the CIR than it did to drop to mincir.
Non-Configurable Parameters
interval (Tc)
The time interval during which you send the Bc bits in order to maintain the
average rate of the CIR in seconds.
Tc = Bc/CIR in seconds.
The range for Tc is between 10 ms and 125 ms. The router internally
calculates this value based on the CIR and Bc values in the map class. If
Bc/CIR is more than
or equal to 125 msec, it uses the internal Tc value. If Bc/CIR is less than
125 ms, it uses the Tc calculated from that equation.
byte increment
The actual number of committed bytes sent per Tc. We can calculate this
using the following formula:
Cir * Tc / 8.
byte limit
The actual number of bytes sent in the first Tc. We can calculate this using
the following formula:
byte increment + Be/8 (measured in bytes)
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