All:
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."
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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