From: sumit.kumar@comcast.net
Date: Fri May 06 2005 - 16:48:20 GMT-3
Groupies,
CCIE Prac studies vol-2 : Cisco recommends the Bc vlaue should be equal to CIR*1.5 seconds. and Be= Bc*2.
The earlier recommendation for FRTS are Tc= (125ms)
To test the router defaults I specified a CIR of 2 Mbps w/o Bc and Be with CB-Policing, CB-shaping and GTS on interface. Here's what it shows:
For CB-shaping;
IER7#show policy-map interface
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
2000000/2000000 12500 50000 50000 25 6250
Adapt Queue Packets Bytes Packets Bytes Shaping
For CB-Policiing :
Serial0/0:0
Service-policy output: test
cir 2000000 bps, bc 62500 bytes
For GTS on interface:
#Show run int serial 0/1
interface Serial0/1
traffic-shape rate 2000000 50000 50000 1000
Looks like the default Tc for CB-shaping and GTS is set to 25ms
but for CB-policing is 250 ms
Anyone can explain this, what value should we use in Lab ?
thanks
Sumit
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