I'll take a crack at this:
Think about RIP version 1 - it sends out a broadcast at both the MAC and IP
address layers. On an ethernet LAN, this is fine, and anyone who needs a
RIP update will process it, and anyone who doesn't want it will ignore it.
But everyone who needs it will get it - a one-to-any broadcast.
On a hub-and-spoke Frame Relay topology, though, simply broadcasting the RIP
packet out the serial interface won't work. There are multiple
subinterfaces, each containing a PVC which leads to a spoke on the network.
For this reason, multiple RIP packets must be created, and must be sent out
each subinterface/PVC pair, one by one - which is more of a unicast function
than a broadcast function.
Does this help? Let me know -
Bradley Wilson
CCNA, CCDA, MCSE, NNCSS, CNX-A, MCT, CTT
----- Original Message -----
From: A.Strobel
To: [EMAIL PROTECTED]
Sent: Saturday, September 30, 2000 3:18 AM
Subject: About Frame Relay
Sometimes, understanding just one sentence takes hours.
The following sentence has taken my time for more than a week, still I can
not
get it.
Could somebody please explain and enlighten me please:
"Frame Relay network, like most WANs, is based on star topologies, and does
not support one-to-any broadcasting. "
This is from the CID book by Matthew Birkner, page 302.
TIA
A. Strobel
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