From: James.Jackson@broadwing.com
Date: Mon Jul 14 2003 - 17:27:50 GMT-3
The requirements (under QoS) state to set CoS value to 1 for all frames
received from IP Phone-1 regardless whatever IP Phone or PC transmits.
-----Original Message-----
From: Jason Cash [mailto:cash2001@swbell.net]
Sent: Monday, July 14, 2003 3:15 PM
To: ccielab@groupstudy.com
Subject: 3550 Config - vocie Vlan, mls qos. etc.
I am working on IPE Section 36 and the Advanced 3550 section instructs:
IP Phone - 1 will be on VLAN 101 & connecting device to IP Phone will be on
VLAN
102. IP Phone will be using 802.1Q encapsulation.
IP Phone - 2 will be on VLAN201 & connecting device to IP Phone will be on
VLAN202. FastEthernet0/12 will be statically configured to 802.1Q trunking
mode
for IP Phone-2 connectivity.
The solution is provided as such:
interface FastEthernet0/11
switchport access vlan 102
switchport voice vlan 101
switchport trunk encapsulation dot1q
switchport priority extend cos 0
no ip address
mls qos cos 1
mls qos cos override
spanning-tree portfast
!
interface FastEthernet0/12
switchport trunk encapsulation dot1q
switchport trunk native vlan 202
switchport mode trunk
switchport voice vlan 201
no ip address
spanning-tree portfast
I understand the commands entered now, but that still does not explain how
the values were arrive at. In particular the '1' in 'mls qos cos 1'. I
take this to be that the CoS value is set to 1 on all incoming packet to the
interface, but why 1? Can someone provide me with a ToS/ CoS/DSCP chart?
Also, it seems that the same instruction is given for IP Phone 2, but the
config is not identical. Any explanations are appreciated
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