I need to trouble shoot some apparent packet loss on a 7206VXR with a
NSE-1.

Weve had some folks downstream of us say that doing traceroutes to their
network through us that packets are dropping on our router. I'd like to
find a way to actually see if this is the case. I'm kind of concerned that
it handling too much traffic for the backplane. 

It has 6 Faste connections, one of which is going to our upstream that
handles on avg about 15 Megs out and about 18 Megs in.

One item of note is this router is connected to our upstream providers
router via faste connection to their 7204vxr which handles a radio based
DS3 for our primary connectivity. 

They have told us to config our ethernet port to half duplex so packets
will be retransmitted if they get lost in their ATM cloud so we have a
fairly high collison rate on this port. I dont know enough about ATM to
say if this is good or bad...?

We policy route and use ip route-cache policy on each interface. Main
interfaces show no drops on the input side on the two busiest faste ports:

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

Output queue 0/40, 1466359 drops; input queue 0/75, 0 drops

Output side here we rate-limit outgoing P2P stuff a bit.

CPU usage is about 20-25% on avg depending on time of day. 

Been hunting on CCO about the NSE-1 to find out what it can handle PPS
wise but nothing so far except stuff on PXF and CEF and how great the
NSE-1 is. Anyone know PPS for this device? CEF is not turned on but
wondering if it would make a diff?

Customer is doing traceroutes from http://visualroute.visualware.com and
doing our own it does indeed show packet loss starting at our router.
Though I'm not one to take that at face value.

Anyway to acutally tell for certain if the router is dropping packets?

thanks for any input.
Keith




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