From: p729@xxxxxxx
Date: Sun Jun 09 2002 - 18:49:34 GMT-3
I don't have Solie's book, but a useful way to think about CIR vs. port speed i
s CIR is the commited data rate _through_ the network, while port speed sets th
e rate that data is clocked _into_ the network.
Another way to think of it is in terms of an Ethernet connection. Ethernet's "p
ort speed" is 10 mbit/s, but many other factors contribute to overall end-to-en
d throughput of much less than 10 mbit/s. It essentially boils down to a TDM-ty
pe function where data is bursted on to the media at the port speed, but typica
lly with "a lot of open time slots," which cuts down on overall throughput.
With that said, I would contend that the CIR should be set to 64000 on both end
s of a point-to-point PVC between the two referenced sites. Hopefully, if multi
ple PVCs are converging into the T1-side, you have the latitude to differentiat
e between the PVCs and assign CIRs accordingly. If not, then maybe you do have
to set the CIR equal to the port speed for the aggregate and flow-control each
using BECNs.
Regards,
Mas Kato
https://ecardfile.com/id/mkato
============================================================
From: "David Ham" <ccieau@hotmail.com>
Date: 2002/06/09 Sun AM 06:42:38 EDT
To: ccielab@groupstudy.com
Subject: FRTS verfication
Hi all,
Can someone verify that P366 Solie's book.
Frame-relay cir -- set this speed to be the physical port seed of the
circuit.
Is this should be " set this speed to be the lower end of physical port
speed of the circuit?
Since Solie's book has example with one-end has 1.544 mbps and other end has
64k bps and used frame-relay cir 1544000.
I think it should be frame-relay cir 64000.
Let me know
Regards,
David Ham
This archive was generated by hypermail 2.1.4 : Tue Jul 02 2002 - 08:12:29 GMT-3