Re: [Pppext] [Int-area] PPP-to-ethernet

[Mark Townsley <townsley at cisco.com>]

Taking this to the pppext mailing list.

- Mark

Derick Winkworth wrote:
>
> All:
>
>  
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> Mulitple router vendors have a feature in which you can essentially 
> "bridge" a PPP link to an ethernet link. Cisco calls this feature 
> "local-switching." Juniper calls it "translational cross-connects."
>
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> I find that both of these vendors implementations have their 
> shortcomings, and I think there could be some benefit to creating a 
> standard for accomplishing this. I am not aware of any standard for 
> doing this.
>
>  
>
> My thought was essentially using the address field as defined in RFC 
> 1662. Differing addresses in this field would be used by the 
> translating router to forward traffic to differing neighboring routers 
> on the ethernet segment. So there would effectively be a 
> PPP-address-TO-Ethernet-MAC table. Neighboring routers would be 
> discovered via IGMP or IRDP (as Cisco kind of does it today, but "not 
> really") on the ethernet segment. Routers responding would have PPP 
> addresses created for them in a state-table, which is link-scoped. So 
> there would be a different table for every PPP link.
>
>  
>
> At the IP layer, the remote-end PPP device would obviously have an 
> address that is native to the IP subnet of the ethernet link.
>
> Anyway, anyone have any thoughts on this?
>
>  
>
> Derick
>
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