From: Jonathan V Hays (jhays@jtan.com)
Date: Fri Sep 19 2003 - 21:17:50 GMT-3
Sorry about the late reply. See bottom of email.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
MADMAN
Sent: Wednesday, September 17, 2003 11:55 AM
To: ccie2be
Cc: Group Study; swm@emanon.com
Subject: Re: ATM addressing - PVC discovery
ccie2be wrote:
> Hey Scott,
>
> Just as I figured (I was 99.999% sure that you would know about this.
How you
> and people like Fred, Brian McGahan and Brian Dennis are able to amass
and
> keep such a detailed knowledge of so many things - that still remains
a
> mystery to me).
>
> Please see comments in-line
>>Actually, you have to use the 'subinterface' parameter on that line in
>>order for subinterfaces to be created.
>>
>>However, you need to remember that subinterface numbers are merely a
>>logical representation of what the PVC is. Whether you have atm
1/0.32
>>or atm1/0.1 representing whatever PVC you choose, it doesn't matter to
>>anyone but you!
>
>
> This seems to contradict what Pildush writes on page 568 in Solie's
book,
> Practical Studies and what's in the cisco documentation ie. the vpi #
must =
> the subinterface #. For example, suppose that there are 3 PVC's
configured on
> the switch which have the following vpi/vci values:
>
> vpi vci
> pvc1 1 25
> pvc2 2 35
> pvc3 3 45
>
> You seem to be saying that it's OK to create a single atm multipoint
> subinterface, for example,
> interface atm 0.32 multipoint, for all 3 pvc's even though they each
have
> different vpi values. By using the atm ilmi-pvc-dicovery subinterface
command,
> all 3 pvc's will be put on the int atm 0.32 multipoint subinterface.
Am I
> understanding you correctly?
As the previous person mention the subinterface number has absolutely
nothing to do with the vpi/vci. I always match the vci with the
subinterface, same with frame relay and DLCIs, just makes looking at and
troubleshooting easier. I'm not familiar with te book you referance but
I hope your missreading it;)
And yes you can use a multipoint interface and simply map all the
vci's, don't know why you have several differant vpi's though there is
no reason you can't. BTW the physical interface is multipoint, no need
to subinterface to "create" a multipoint.
Dave
David Madland
CCIE# 2016
Sr. Network Engineer
Qwest Communications
612-664-3367
Dave,
I think "absolutely nothing to do with the vpi/vci" might be a bit too
strong.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fwan_c/wcfatm.htm#1001188
<quote>
Use the subinterface keyword in Step 4 if you want the discovered PVCs
to reside on an ATM subinterface that you specify in Step 6. The
discovered PVCs are assigned to the subinterface number that matches the
VPI number of the discovered PVC. For example, if subinterface 2/0.1 is
specified using the interface atm command in Step 6, then all discovered
PVCs with a VPI value of 1 will be assigned to this subinterface. For an
example, see the section "Configuring PVC Discovery Example" later in
this chapter.
</quote>
Jonathan
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