The Routing Over Large Clouds Mailing List Archive by date

[rcoltun@sura.net]

NHRP looks quite reasonable to me except for the fact that routers
will have to periodically send out requests:

>8.1 Router-to-Router Operation
>
>   In practice, the initiating and responding stations may be either
>   hosts or routers.  However, there is a possibility under certain
>   conditions that a stable routing loop may occur if NHRP is used
>   between two routers.  This situation can be avoided if there are no
>   "back door" paths between the entry and egress router outside of the
>   NBMA network, and can be ameliorated by periodically reissuing the
>   NBMA network, and can be ameliorated by periodically reissuing the
>   NHRP request.  If these conditions cannot be satisfied, the use of
>   NHRP between routers is not recommended.

In my mind this a bit of a hand-wave although I certainly don't have
better solution; doesn't look like it will scale all
that well. Does it give anyone else heartburn?

One additional (implementatin related) question - suppose a NHS has more
than one ATM port.  How is it supposed to determine if both ports are on
than one ATM port.  How is it supposed to determine if both ports are on
the same NBMA network? It certainly can look at either IP or P-NNI and
the same NBMA network? It certainly can look at either IP or P-NNI and
make some determinations...

Thanks,
---rob