[j-nsp] ATM <-> Ethernet TCC or VPLS, converting from cisco

[Rafał Szarecki]

I do not think cisco supports _IP_ interworking, what is TCC.

I rather expect that on ATM pvc there is ethernet frame encapsulated 
into snamp aal5 frame (ethrenet over ATM).
So this cisco setup is regular layer2 ethernet cross-connect, where one 
of etherent ports is on top of atm.
In orther works all ATM related headers are terminated and Ethernet 
frame, which was received within ATM is relayed to FE.

Junos can also do this. But this is regular CCC/L2circuit.

Will Orton napisał(a):
> Hey all,
>
> I have a working config running on a Cisco 7206 I've inherited.
> It looks like a TCC between an ATM DS3 PVC and a fast-E VLAN:
>
> ----
> interface ATM1/0
>  no ip address
>  atm scrambling cell-payload
>  atm framing cbitplcp
>  no atm ilmi-keepalive
>  no atm enable-ilmi-trap
>  pvc 1/100 l2transport
>   ubr 44209
>   encapsulation aal5snap
>
> interface FastEthernet2/0
>  description Trunk to switch
>  no ip address
>  duplex full
>
> interface FastEthernet2/0.101
>  encapsulation dot1Q 101
>
> connect foo ATM1/0 1/100 FastEthernet2/0.101 interworking ethernet
> ------
>
> The ATM PVC is a feed into a VPLS cloud (all IP addressed in a /24).
> The ethernet VLAN feeds to another router (also with an address in the 
> /24). So ARP and IPv4 packets are getting switched between this 
> ethernet and the VPLS cloud out on the ATM (out of my control).
>
> Now, I want to replace this with an M20 with a 4FE PIC and a DS3 ATM
> PIC. It really seems like I just want a ATM PVC - ethernet TCC:
>
> unit 910 {
>     encapsulation vlan-tcc;
>     vlan-id 910;
>     family tcc {
>         proxy {
>             inet-address 10.1.1.1;
>         }
>         remote {
>             inet-address 10.1.1.2;
>         }
> [...]
>
> but in my case, the proxy and remove inet-addresses don't make sense. I 
> need ARP to get passed through the TCC since there's 200 other IPs 
> (remote site routers) on the provider side of the ATM.
>
> Do I need to do something like a 2-port VPLS setup locally on my M20
> instead (so as to handle the ARP correctly, with multiple IPs out on the
> ATM)?. That seems like it would work, but then I need a ATM2 DS3 card
> instead of an ATM1 ($$), and suddenly it becomes cheaper to leave the 
> Cisco in place.
>
> Any ideas?
>
> --
> -Will Orton :: http://www.loopfree.net/
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