jw,
When using Frame Relay the router will have:
- a physical access circuit (this is the circuit between the router and the
Frame Relay provider, i.e. T1)
- a PVC or SVC (this is the "virtual" circuit through the Frame Relay cloud
to the other router)
The physical access circuits can be different for each router. However, a
PVC connected between Router A and Router B will be the same speed. I think
you may be confusing the two types of circuits.
Example:
Router A (main branch router) can have a single T1 to the Frame Relay
provider (CO). This would be the Physical Access Circuit. Router A could
then have multiple PVC mappings, let's say 256k each, to multiple branch
office routers (i.e. Rtr B, Rtr C, Rtr D, Rtr E, Rtr F, etc.). All of these
branch offices may have 512k physical access circuits to the Frame Relay
cloud, but it's the PVC's that will have the same transmission rate (256k
each) back to Router A.
Traffic shaping comes in handy when you have multiple PVC's that basically
oversubscribe your T1 (meaning the cumulative amount of PVC's, in bps, is
more than the bps of the physical access circuit of Router A). Traffic
shaping allows you to keep from oversubscribing your central router by
throttling the amount of traffic transmitted by all of the other branch
offices.
Hope this helps.
Best Regards,
--Mike
-----Original Message-----
From: jeongwoo park
To: Groupstudy
Sent: 12/1/00 1:12 PM
Subject: newbie question on Frame Relay!!
Hi all
I have a quick question.
On the traffic between central router and branch
office router on frame relay, how could central
router's connection rate to FR cloud be different from
branch office router's connection rate to FR cloud?
I could understand if cloud had traffic congestion.
But when there are no traffic congestions, how could
they be different?
These two routers are using same mechanism, Frame
Relay, which gives relatively high-speed transfer
rate.
I happened to ask myself this question while I was
reading about FR traffic shaping. Traffic shaping
could be useful under this situation. ( according to
the book)
Could anyone give clear answer?
I appreciate your reply.
jw
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