From: Marko Milivojevic (markom@vodafone.is)
Date: Thu Jun 21 2007 - 19:49:21 ART
> Besides how could someone tell me the QOS on 6500s are the same as 3560s?
[rant]
Cisco's switching QoS is endless nightmare. Every platform they have (and I
worked with at least 7), has different approach to QoS. Trying to make them
work together and avoid limitations could be CCIE lab test in itself - CCIE
LAN-QOS. Perfect example is "internal" QoS in which some platforms use
internal DSCP markings, while other use internal COS. Some offer DSCP
mutation, other don't. Some have priority queue, some "have" it, but you
need to dance around carcasses of three dead ravens, holding your ears to
actually activate it.
Unfortunately, 6500 and that ba*tard wannabe-router, 7600 are *particularly*
bad when it comes to QoS limitations and insanity. No outbound policing on
some modules strikes me as an interesting one, for example. Total absence of
shaping on LAN modules on a platform that has 1GB of memory, is also totally
confusing (yes, I know it's TCAM and not "real" memory, but that's just a
bad excuse). For all it's worth, 3550 is *much* better and more comfortable
platform to work with as a pure L2/L3 switching platform, if we exclude the
backplane size ;-). Even 4500 in that respect is much more mature, alas no
fabric and 6 Gb/s per line card make it somewhat limited (apart from small
TCAM and no MPLS support).
[/rant]
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