From: Brian McGahan (brian@cyscoexpert.com)
Date: Sat May 31 2003 - 14:59:31 GMT-3
Daniel,
No, configuring your routing protocols to unicast updates is not
required over ATM CLIP SVCs. The ATM arp-server will periodically send
inverse-arp requests to all endpoints of the network, causing these
endpoints to setup the SVC. One the VC is setup, broadcast and
multicast traffic will automatically flow over the VCs as a replicated
unicast.
I *have* however seen some issues with running
broadcast/multicast traffic over CLIP VCs, most likely due to version or
hardware problems. In theory, it should automatically work though.
However, the difference between in theory and in practice is that in
theory, there is no difference ;)
'debug ip packets' and you will see encapsulation failing for
the broadcast or multicast packets if there is an issue. Also, 'debug
atm arp' to make sure that the inarp/arp requests are successful.
<quote>
broadcast
To configure broadcast packet duplication and transmission for an ATM
PVC, SVC, or VC class, use the broadcast command in the appropriate
command mode. <snip>
Defaults
Disabled. For classical IP SVCs, broadcast is enabled.
</quote>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/w
an_r/wratmtxb.htm#1017539
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Toll Free: 866-CyscoXP
Outside US: 847.674.3392
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Daniel Cisco Group Study
> Sent: Saturday, May 31, 2003 5:54 AM
> To: ccielab@groupstudy.com
> Subject: ATM SVCs + Routing Protocols
>
> Unfortunately I don't have any further access to ATM equipment. This
is
> something that I didn't test when I did.....
>
> Maybe someone could try this out, or knows the answer.....
>
> I've seen some ATM configs using Classical IP over ATM (ie ARP
Servers),
> where they specified neighbor commands under the routing protocol
> configuration. The config I saw today was specifically for RIP V2, but
I
> think that I've seen it for other routing protocols as well.
>
> Question: Are neighbor commands required?
>
> My guess is probably yes.....
>
> Why?
>
> My guess is that since we are relying on ARP, there's no way for
classical
> IP over ATM to know WHERE to initiate the SVC to..... ie how can we
find
> the NSAP address of a routing protocol's multicast or broadcast
packet????
>
> Of course, if you bring up the SVC with a ping, and then run the
routing
> protocol, everything should work..... Reboot (or kill the SVC), and my
> theory would suggest that the routing protocol will not bring up the
> SVC....
>
> Am I correct? Can someone try this out, correct, or agree with me?
>
> Thanks in advance.
>
> Daniel
>
>
>
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