Ascend Archive
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Re: (ASCEND) Virtual IP routing / IP Navigator
> >The Virtual IP routing (splitting the router into multiple independant
> >logical routers) sounds like a very cool, but also very unconventional
> >feature.
>
> If progress in routers is unconventional, then yes.
(As far as I know) no router in history has every had more than one
independant routing table. Now we are talking about having multiple
virtual route tables. Like I said, very cool feature, but you have to
admit it was no one line code tweak :-)
> >I guess this is implemented by assigning each interface on the router
> >(perhaps an ISDN connection, an Ethernet interface, or a Frame/ATM
> >PVC) to exactly one of the multiple different routing groups.
>
> Not to exactly one. Individual routes can be assigned to a given physical
> or virtual circuit. But since they are virtual routes, identical addresses
> can co-exist on the same physical network. In other words, a VPN.
If each interface is not "assigned" to a virtual router, then, for
packets arriving over that interface, how does the box know which
route table to use to forward it?
> Route caching is only for "weak" or "legacy" routers that cannot hold the
> entire route table on a media card. Like a Cisco router. :)
:-) Point taken.
> It seems to work very well, even at high speeds like OC-48/STM-16. FYI, the
> IP Navigator OSPF was designed and implemented primarily by John Moy who
> also invented OSPF.
Great!
-Phil
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