From: MMoniz (ccie2002@tampabay.rr.com)
Date: Mon May 10 2004 - 19:09:04 GMT-3
Well I will attempt to
Q1. Priority extend is for traffic originating on a phone switchport..so it
is not the same
as cos 1 cos overide. If you do both and do have a phone connected, the
overide will take precedence.
Q2. You shouldn't have to do anything on the egress port connecting the
switches, as they should use
the same dscp map info by default. You will most likely need to do trust
COS on the ingress of the other switch.
Q3. You can do policy map QOS to distinguish between the different traffic.
(just learned that it actually works
even though show commands for it are not going to work unless you do mls
qos monitor on the ports)
Well that is my opinion.
mike
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Yasser Aly
Sent: Monday, May 10, 2004 5:39 PM
To: ccielab@groupstudy.com
Subject: End-to-End Switch QoS
Hello,
Scenario is as follows: VLAN 4 is configured on many ports on the switch.
One of the ports is connected to a server providing multicast feeds with a
CoS value of 4.
Required:
1) Maintain multicast feed CoS value received at this port as it enters the
switch block.
2) Other ports that belongs to VLAN 4 should be marked with a CoS value of 1
to avoid getting any better treatment.
Solution Provided:
---------------
mls qos
!
int f0/4 ( Where the server is connected )
mls qos trust cos
!
int f0/8 ( Other port belongs to VLAN 4 )
mls qos cos 1
mls qos cos override
-----------------
My questions:
1) Will there be a difference if I used switchport priority extend cos 1
instead of using mls qos cos 1 + mls qos cos override on other ports
that belongs to this VLAN other than the server port ?
2) If the scenario has 2 switches and this VLAN has ports on both switches,
will there be any configuration needed to the trunk ports to maintain the
CoS value or I just need to care about the entry point and that's it ? What
are the guarantees that the CoS values will be maintained between both
switches ?
3) Finally, on the port having the server. Is it possible to assign two
differnt CoS values on the same port ( One for the mcast feed, and other for
the rest of traffic ) ?
Your feedback is highly appreciated.
Yasser
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