QoS in a Campus Network with IP Telephony Solution

From: Antonio Soares (amsoares@netcabo.pt)
Date: Mon Oct 01 2007 - 22:17:53 ART

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Hello group,

I need to configure QoS in a Campus Network composed of several 3750s, 4500s
and 6500s. I'm looking for the minimal config in order to avoid potential
voice quality issues. Right now i have this:

##############################
Catalysts 3750:
##############################
4Q3T (or 1P3Q3T)
##############################
Ports with PC+IP Phone:
##############################
mls qos trust cos
mls qos trust extend cos 0
priority-queue out
##############################
Uplinks:
##############################
mls qos trust dscp
priority-queue out
##############################

##############################
Catalysts 4500:
##############################
4Q1T (or 1P3Q1T)
##############################
Ports with PC+IP Phone:
##############################
qos trust cos
qos trust extend cos 0
tx-queue 3
  priority high
##############################
Uplinks:
##############################
mls qos trust dscp
tx-queue 3
  priority high
##############################

##############################
Catalyst 6500:
##############################
Ports with PC+IP Phone:
##############################
WS-X6148-45AF
2Q2T
WS-X6348-RJ-45
2Q2T
##############################
mls qos trust cos
mls qos trust extend cos 0
##############################
Uplinks:
##############################
WS-X6724-SFP
1P3Q8T
##############################
mls qos trust dscp
priority-queue cos-map 1 5
##############################
Voice Servers:
##############################
WS-X6748-GE-TX
1P3Q8T
##############################
mls qos trust dscp
priority-queue cos-map 1 5
##############################

I know that Cisco provides a QoS Network Design Guide:

http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigrati
on_09186a008049b062.pdf

But i really wonder if i need to implement all those complex configurations
to accomplish my goal.

Any sugestions are welcome.

Thanks.

Regards,

Antonio Soares
CCIE #18473, CCNP, CCIP
http://pwp.netcabo.pt/amsoares/

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