From: Glenn Johnson (gj7@comcast.net)
Date: Sun Aug 03 2003 - 02:22:27 GMT-3
If you use this on any given 3550 switchport:
1) mls qos cos 5
mls qos cos override
[ Presumably overrides whatever is
coming into the switch port (voice and data)
from the phone/pc and sets COS to 5 ]
and then enter this:
2) switchport priority extend cos 5
[ Presumably instructs the IP phone(?) to
override whatever cos might be coming from
an attached PC and sets COS to 5 ]
Is command 2 superfluous?
Could voice traffic theoretically suffer, relative to data, on the way to
the 3550 switch port if an attached PC had all data traffic set at COS 7 and
command 2 was not used. I guess it comes down to what level of COS
processing/prioritization, if any, can be done by the IP phone with its
integrated switch before info is forwarded on to the 3550 switch. Thanks in
advance for any comments. I have seen
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550scg/s
wvoip.htm
and
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550scg/s
wqos.htm
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