Re: (ASCEND) Poor TNT performance?

[Tim Basher <basher@ces.cwru.edu>]

> We typically see around one call coming up or going down per second on
> each primary rate.
...
> Every site demands their full bandwidth and our observations are that
> most of them do indeed saturate their links almost continously during
> the day.

Since there are 32 channels in an E1 circuit, this would mean that each
connection is lasting only about 30 seconds on average.  This is at odds
with the idea that the links are continously saturated.  If they are
saturated, they should not be going up and down twice a minute.

> am I right in assuming that the TNT's IP routing is all done by the
> main CPU rather than by a hardware routing engine?

No, the routing table is maintained by the shelf router and distributed
to each slot card, where the IP routing is done.

> Performing a throughput test revealed that we could only get 20kbps over
> a 64kbps connection.

What type of traffic (ICMP, TCP, UDP) with what size packets (64, 1500)?

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