1) It depends. If you have RSRB configured then the virtual ring number must
be the same on both the bridges whereas this virtual ring number can be
different if you are using DLSW.
2) Yes you are right about the ARP requests. When a LEC receives an ARP
request it forwards the request to the BUS using the multicast send VCC. The
BUS then forwards the request to all the LECs through the multicast forward
VCC. The LEC with the destination device attached will also receive this ARP
request and will forward the request to all ports in the corresponding VLAN.
The destination device will service the request and then the LEC will have
to uni cast this reply back to the oriiginator. Here is where the
LE_ARP_REQUEST is generated in order to map the MAC address of the source to
a NSAP address. In short the IP ARP request is serviced by the BUS while the
LE_ARP_REQUEST is serviced by the LES. Eventually a Data Direct VCC will be
established between the two LECs. There are some other issues before the
successfull establishment of a data direct vcc but i should rather not go
into the details :)
My recommendation is that if you need more insight into ATM LANE and other
advanced switching concepts get a hold of Cisco LAN Switching by Kenedy
Clark.
Regards
Atif
-----Original Message-----
From: Kristopher B. Climie <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Sunday, September 17, 2000 9:09 AM
Subject: Re: Obscure (?) questions
>Sorry, suppose I should have mentioned that-
>
>In the Exam Cram for CCIE, on pp. 396, the question asks what the rif is
>from PC-a to PC-c. PC-a is on a token ring and pc-c isn't, it is on
>etherenet. Well, that is great I understand that the RIF will be removed.
>However, the question got me thinking, what about the RIF from PC-a to PC-b
>which is on a seperate token ring. The disparraging part is that the
>virtual ring on bridge 1 is 10 and the virtual ring on bridge 2 is 0x10 (or
>16). My question is this -- doesn't the virutal ring number need to be the
>same among all bridges?
>
>
>Also, while going over ATM LANE, I began to wonder exactly how broadcasts
>are handled. I understand that the BUS is supposed to handle all
>broadcasts, and also that an LE_ARP request is maps MAC address to ATM
>addresses. That got me wondering how an IP ARP request is handled. Does
>the client send the ARP to the BUS, which then forwards it via its
>point-to-Multicast Forward vcc, or does the BUS just handle it on its own?
>
>Thanks,
>K
>
>-----
>Kristopher B. Climie, CCNP, CCDP
>
>""Atif Awan"" <[EMAIL PROTECTED]> wrote in message
>005001c0203d$538828a0$291a87cb@atifawan">news:005001c0203d$538828a0$291a87cb@atifawan...
>> Can you please tell us from where did you get hold of these questions ?
>> Something wrong here :-)
>>
>
>
>
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