[j-nsp] DSL Aggregation - ATM vs. ATM2

[David Sinn]

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On Dec 23, 2008, at 11:46 PM, Charles Sprickman wrote:

> interface ATM3/0.1163 point-to-point
> ip unnumbered Loopback1
> atm route-bridged ip  <<<<---- SECRET SAUCE HERE
> pvc 0/1163
>  encapsulation aal5snap
> !
>
> The above is what Cisco calls "route bridged encapsulation" or some  
> such thing.  It is a very cool feature that replaced the old model  
> using BVI interfaces which had a whole slew of problems including  
> sending broadcasts where they shouldn't, letting customers grab as  
> many IPs as they could, and letting them steal each other's IPs if  
> you didn't do static ARP entries for everyone.
>
> So given the above, are those configs possible in JunOS?  And if  
> they are, can I get away with the non-ATM2 card?  What interesting  
> stuff does ATM2 add that might be useful for our very narrow  
> application?


I've not tried to see if it works, but at least the client DSL  
interface for a J-series will let you set a unnumbered-address:

dsinn at jrtr# set interfaces at-3/0/0.0 family inet unnumbered-address ?
Possible completions:
   <[Enter]>            Execute this command
   <source>             Interface from which to take local address
   destination          Destination address
   destination-profile  Profile to use for destination address
   |                    Pipe through a command

Similarly the encap method you need is 'ether-over-atm-llc':

dsinn at jrtr> show configuration interfaces at-3/0/0
atm-options {
     vpi 0;
}
dsl-options {
     operating-mode auto;
}
unit 0 {
     encapsulation ether-over-atm-llc;
     vci 0.35;
     family inet {
         address x.x.x.x/24;
     }
}


David
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