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A 7600 SIP-400 isn't a 28xx and 7600s (and 6500) often have fewer features then software only routers. (NB: actually if I remember correctly, the SIP-400 [and SIP-200 and FlexWAN] supports more QoS features then most other 7600 interfaces, but unfortunately it might still not support all the QoS features found on software based routers.)
Also, in practice, full featured QoS isn't often as critical on the faster interfaces likely used on a 7600 vs. the slower interfaces found on a 28xx.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...