From: Greg Ferro (gferro@xxxxxxxxxxxxxxxxxxx)
Date: Sun Apr 08 2001 - 06:11:49 GMT-3
For the router to autodiscover VP/VC you must be using UNI V3.1 or later on
BOTH switch and router. ILMI sets up the relationship between the two
devices and does a DLSW-like capabilities exchange (more or less). ILMI is
standardised on VP 0 VC 16.
QSAAL is only required when you are using SVC's as this is the signalling
for circuit setup and tear down. The standards define QSAAL on VP 0 VC 5.
Note that VP 0 and VC 0 - 16 are reserved by the standards.
So if you have a Cisco Lightspeed A100 (like I did) which supports UNI 3.0,
PVC autodiscovery does not work. More modern switches work just fine.
To test this set the UNI on the router to be UNI 3.0. The autodiscovery
commands are all present, it just doesn't work.
At 10:13 AM 7/04/2001, you wrote:
>Leah,
>
>My understanding is that you don't need any of "pvc 0/5 q" and "pvc 0/16
>ilmi" if you are doing PVC and you know VP/VC pair. However as the example
>shows - you need pvc 0/16 ilmi (not qsaal though) if you don't know your
>VP/VC pair and using pvc discovery. After you have the VP/VC pair you can
>remove pvc 0/16 and configure your pvc with found VP/VC pair. I guess ATM
>switch and your ATM card must support this feature. It may be handy if you
>are asked to configure PVC and not given PVC parameters (VP/VC).
>
>My ATM knowledge is limited so somebody correct me please if I am off
>track.
>
>Nodir
>
>
>On Fri, 6 Apr 2001, Leah Lynch wrote:
>
> > I do not have access to ATM on my home lab so I am just reading about it to
> > learn. I am looking at Lab 13 from CCbootcamp and I have noticed that they
> > are using qsaal for the point-to-point subinterface PVCs. I am also looking
> > at the Doc CD and I notice that they only use qsaal for LANE and SVCs.
> Is it
> > necessary to specify qsaal on a PVC?
> >
> > CCbootcamp:
> >
> > interface ATM0/0
> > no ip address
> > no ip directed-broadcast
> > atm pvc 1 0 5 qsaal
> > atm pvc 2 0 16 ilmi
> > no atm ilmi-keepalive
> > atm ilmi-pvc-discovery subinterface
> > !
> > interface ATM0/0.5 point-to-point
> > ip address 172.16.2.1 255.255.255.0
> > no ip directed-broadcast
> > ip pim sparse-dense-mode
> >
> > Doc CD:
> >
> > interface atm 2/0
> > pvc RouterA 0/16 ilmi
> > exit
> > atm ilmi-pvc-discovery subinterface
> > exit
> > !
> > interface atm 2/0.1 multipoint
> > ip address 172.21.51.5 255.255.255.0
> >
> > Leah Lynch
Regards
Greg Ferro | |
Senior Network Engineer, CCIE #6920, CCNP ||| |||
NetStar Australia Pty Ltd. .|||||. .|||||.
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