All platforms except the VIP-enabled Cisco 7500 series router and the Catalyst 6000 have default min threshold values shown in the table referenced above and default max threshold of 40.
40 is a long way from some values I've seen in Catalyst 6500's, like 512, and the max configurable value is 4096.
1) Does anyone have any guidance, references, tips, real-world experience with tuning the max threshold value?
2) Does max threshold _need_ to be tuned in the real world?
3) Is the maximum value for max threshold platform dependent?
Any feedback or insight would be appreciated...
"Got it. There is a class of traffic I wouldn't mind starving out--scavenger class. Hmmm... "
Perhaps, but if there is traffic that can be totally starved, why not block it with an ACL.
Personally, I prefer to configure scavenger with the very minimal bandwidth possible, yet since I'm not blocking it, it can have the whole circuit's bandwidth, if available. (You could still rate limit it or shape it, but if the bandwidth is available, and if there's no additional usage charge, why not use it?)
Also, gee I'm really, really sorry your backup traffic is only getting 8 Kbps during peak traffic loads during the day. Have you considered scheduling that for overnight?
Also if scavenger shares a queue with other traffic, it will delay that other traffic even while your RED is dropping scavenger excess packets.