From: Richard Wagner (Richard.Wagner@xxxxxxxxxxxx)
Date: Tue Feb 22 2000 - 13:26:37 GMT-3
A PC that is an ATM LEC has only an ATM interface, so the "LAN
Emulation" is the emulation of a broadcast network (ethernet/token
ring LAN) over ATM's non-broadcast-multi-access network type.
Since you can't broadcast on ATM, without creating virtual circuits to
all endpoints (kinda like frame relay), you need to emulate the
broadcast function. The BUS (broadcast/unknown server) does just
that. All LECs have a virtual connection to the BUS (which is located
on the save device as the LES). So if you have a LAN broadcast that
needs to go out, the LEC hands it to the BUS (broadcast server).
Since all LEC's have a virtual circuit connection to the BUS, the BUS
gives it to all LECs.
Let's say that an ARP goes out and the reply has to go back to a MAC
address that the LEC doesn't know about. The LEC hands it to the BUS
(unknown server) and the frame goes to all LECs. Once the LEC that
serves the MAC is found, a direct virtual circuit between the two LECs
is created and the traffic stream is no longer handled by the BUS.
So the ARP broadcast (and ALL MAC broadcasts, Layer2) are handled by
the BUS.
I have no idea about your second question... sorry.
-----Original Message-----
From: Muhammad Afaq Khan [mailto:afaqk@super.net.pk]
Sent: Sunday, December 31, 1995 11:13 AM
To: ccielab
Subject: Two Qs
hello,
I'm confused with these TWO, can anyone please help me out, or just
give his/her opinion!!
Q1.
How a PC(an ATM LEC, client) performs the IP ARP(Layer2->Layer3) ?
Actually I know that BUS is involved with, when resolving a MAC to its
corresponding ATM address for an unknown LEC(client).But what about
the IP ARP broadcast, will it be handled by BUS too??
Q2. Can we use "schedular interval <msec>" command to lessen the
burden on CPU, considering CPU is under heavy loads, e.g., handling
too much debug traffic.Is there any other method we can reduce the
burden on CPU in this situation?
Thanx in advance,
- Muhammad Afaq Khan
CCIE-candidate(ccna,ccnp,ccda)
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