From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Sat Aug 04 2001 - 00:39:49 GMT-3
I've been wrestling with this a bit myself lately, more because of some
customer designs than for the lab, but it all applies ;->
first of all, the configuration guide on CCO or the doc CD is worth reading.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_
c/wcdatm.htm
watch the wrap
secondly, conceptually speaking, ATM behaves just like frame relay. the
concepts, the behaviors, the "tricks" are about the same. that's why Caslow
states in his book that a firm grasp of frame relay is critical to the
understanding of ATM.
some comments below:
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Michael Locke
Sent: Friday, August 03, 2001 7:28 PM
To: ccielab@groupstudy.com
Subject: ATM PVC config.
Hi all,
Sorry if this is basic, but I don't have access to ATM
equipment and would like some thoughts on this issue.
With LANE out of the lab, it seems as the only two
options left on the exam for ATM config are PVCs and
classical IP. I can config. classical IP with no
problem. My questions are with PVCs.
If you are doing PVCs should you configure 0 16 and 0
5 pvcs in addition to the PVC for passing data or
leave them out. I know these are mainly/basically for
SVCs.
CL: the pair 0/16 is for ILMI and ILMI PVC discovery. if you choose this
option your ATM interface will detect and load the VPI/VCI pairs for you.
this can be used in conjunction with ATM inarp ( inverse arp ) for mapping
of the protocol address to the ATM VC's.
CL: in the real world, you have to be sure that your carrier is providing
ILMI to you. it is my understanding that some of them do not automatically
do so.
If you do not want to rely on atm inverse arp then you
need a map - same as with frame rely. Can someone
show me an example of a basic atm map.
CL: just as with frame relay. if you use the physical interface, or if you
use a point to multipoint subinterface, you have to map.
CL: the config guide on CCO gives some basic examples.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_
r/wratm/wrdoampv.htm#xtocid179303
definitely watch the wrap
protocol protocol {protocol-address | inarp} [[no] broadcast]
protocol ipx inarp no broadcast
etc
CL: note that like with frame relay, the broadcast option can be of great
benefit
The reason I
ask this is I can't find one in print, don't have
practice equipment. Another side to this same
question is if you are configuring only 1 PVC, then do
you have to use a map class for is there an
easier/more basic way to do this.
CL: I'm not sure if this is where you are going, but as with frame relay, if
you have point-to-point subinterfaces, there is no need for protocol
mapping. some kind soul beat me over the head with a 2x4 to get this point
to sink through. :->
HTH
Chuck
thanks,
michael
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:31:45 GMT-3