From: Petr Lapukhov (petrsoft@gmail.com)
Date: Mon Jun 12 2006 - 12:35:10 ART
Dave,
AFAIK, when you put "mls qos cos override" , you actually
override any _trust_ state for a port. So with Fa 0/4 you
will mark with CoS _every_ frame, even those sent by
IP-Phone itself.
You also forgot to configure which option you trust, e.g.
"mls qos trust cos"
AFAIK, by itself "mls qos trust device cisco-phone" does nothing,
just instucts to remove trust state in case of IP-Phone is gone.
--So if you need to force change to PC's CoS you should probably use "legacy-like" switchport priority extend cos command.
HTH Petr
2006/6/12, Schulz, Dave <DSchulz@dpsciences.com>: > > I have a voice vlan question. I have seen that there are two possible > configurations to question that says to trust the cisco phone connected > to the switchport and configure any pc/device connected to the phone to > have it's cos rewritten to 2. I would prefer the configuration for > fa0/4. However, when would we want to use the configuration on port > fa0/3? Do they not accomplish the same thing? Just trying to get a > handle on the differences here. > > interface FastEthernet0/2 > switchport access vlan 10 > switchport mode dynamic desirable > switchport voice vlan 15 > switchport priority extend cos 2 > mls qos trust device cisco-phone > spanning-tree portfast > ! > ! > interface FastEthernet0/4 > switchport access vlan 10 > switchport mode dynamic desirable > switchport voice vlan 15 > mls qos cos 2 > mls qos cos override > mls qos trust device cisco-phone > spanning-tree portfast > > > Dave Schulz > > Email: dschulz@dpsciences.com <mailto:dschulz@dpsciences.com > > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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