From: Devender Singh (devender.singh@xxxxxxxxxxxxxx)
Date: Sun Jul 01 2001 - 22:51:34 GMT-3
Can you please post your configs. I had not same but similar problem. I had
to switch os fast switching on PSTN.
Devender Singh
BE(Hons), CCNP
IP Solution Specialist
-----Original Message-----
From: Don Dettmore [mailto:don@donshouse.com]
Sent: Saturday, 30 June 2001 5:35
To: CCIE Lab List
Subject: problem in my lab
Having a problem in my lab today that i cant figure out - getting tired of
banging my head on the wall and would like to move on - anyone have any
ideas?
R1 -----Ethernet----- R2 -----PSTN----- R3 -----Serial -----R4
R2 and R3 are connected over PSTN (R2 has modem attached to aux port, R3 has
modem attached to Async port).
Problem - Ping times routed THROUGH R2 very unstable (about 50% in the
100-1000 ms range - about 50% in the 2000 - 10000 ms range). All packets
get
delivered - but many LONG delays.
This issue DOES NOT occur directly from R2 to R3, or from R4 to R2 - or from
R1 to R2 - these pings are a consistent 140-160 ms over the dialup link and
2
ms over ethernet.
The issue DOES occur when R1 pings R3 or R4 and vice versa - whenever
packets
are routed THROUGH R2 response is EXTREMELY slow (but not always - some get
through at 200 - 300 ms, some at 8-10 seconds).
Routing protocol is BGP - all routes are stable - no dropped connections.
Don't think routing is an issue.
The only thing I can think of is that I recently added 4 serial ports to R2
-
it is now acting as a frame switch for other parts of the lab. It
definitely
seems like R2 is the bottleneck - but debug ip packet isnt telling me
anything
- CPU usage is fine.
I've used the same modem/PSTN config for many other tests - it has always
worked fine - I've done numerous dialup labs over this same phone link with
the same modems and async configs.
Any ideas on where to start?
Thanks to anyone with the patience (or lack of life) to have read through
this
entire email :)
Don Dettmore
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