Hi,
Need some reassurance I'm on the right track.
We just switched our ATM PVCs over to a 7507 using a PA-A3-T3 card and running in a VIP4-80 and dual RSP4 processors. We upgraded the circuit from a full T-1 to a fractional T3 running at 25meg.
We were experiencing a lot of output drops on the 3662 we had the PVCs on before the move and continue to have a lot of output drops on the 7507. These drops occur on our high volume/speed CIR PVCs and do not on our low volume/speed CIR PVCs.
Router is running IOS version 12.3(13)T1.
Now, all the research I've done so far shows I need to enable some form of queueing (we only use FIFO currently) and it seems DWRED Per-VC is the way to go. This way I can utilize the processing capability of the VIP4-80 we have the PA-A3 installed in.
We did not use anything other than FIFo queueing on the 3662.
So, now onto my questions. Is Per VC-DWRED the way to go (I already have the Cisco doc on this, so no link necessary)? What pitfalls should I lookout for (particularly in the configuration of the individual ATM subinterfaces and globally)?
I'm sure someone out there has had similar experiences and what results should I look for?
To sum up the scope of the problem, I've had 603035 output drops on the main interface in 1d16h since last counter reset.
Here's the current interface and subinterface config:
interface ATM0/1/0
description *** AT&T DNAC/80/ATI ***
mtu 1500
bandwidth 25024
no ip address
no atm auto-configuration
no atm ilmi-keepalive
no atm address-registration
no atm ilmi-enable
interface ATM0/1/0.40 point-to-point
description *** PVC to W L, CT ***
ip address 10.222.0.41 255.255.255.252
ipx network 222A400F
ipx type-20-propagation
pvc 2/40
protocol ip 10.222.0.42 broadcast
vbr-nrt 1244 1244
oam-pvc manage
As you can see, we are routing IP and IPX. Is there something I need to look for for IPX as well?
I thank you for your help in advance.
