GRZ061@DBNGMD21.BITNET (Detlef Straeten +49 228 81996-48) (08/03/90)
Hello everybody, hello experts,
here are some questions concerning the X.25 functionality
of the CISCO router in a specific environment:
I am not an IP expert, but I have to deal with the connection of
a CISCO box to a X.25 Public PSDN in germany.
Here is the proposed configuration:
---- other connections
IP / X.25 +-----+ /
Source A 64KBit ---------------->| |/
Source B 64KBit ---------------->| | native IP > 384 KBit
Source C 64KBit ---------------->|CISCO|=================>
Source D 64KBit ---------------->| |
Source E 64KBit ---------------->| |
(i.e. 5 x 64 KBit) +-----+
The german PTT uses X.25 standard 1984 with variable X.25 packet size
and negotiable level3 (packet level) window sizes.
As far I am informed CISCO supports only packet sizes up to 1024 Bits
and window sizes up to 7.
Here the questions:
1.) Does anybody know something about the switching rates, i.e.
how many X.25 packets can be switched from one CISCO (X.25 port)
to another port? As far as I am informed 'high performance
switching' (like CISCO-IP-switching) is not supported
because of the CISCO X.25 software solution.
2.) What impact will the substitution of the five 64KBit X.25 ports
in one 2 Mbit X.25 port have concerning throughput ...
3.) Will CISCO support PVC (permanent virtual circuits) in the
future ?
4.) Will CISCO (or has CISCO) implement(ed) some X.25 capabilities to
manipulate X.25 source or destination addresses in an incoming
call packet ?
5.) What are the minimum soft- and hardware requirements
for a cisco router to support the configuration mentioned above.
I would appreciate it if some of you can give me some hints how
to deal with this situation in a efficient way.
Please send your answer to GRZ061@DBNGMD21.BITNET or on the list.
I will summaries the incoming mail and send it back on the list.
Many thanks in advance
Detlef
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