True - if you do set it as an Access VLAN on the adjacent switch -
DSCP would be your only option at that point.
--
Mark Snow
CCIE #14073 (Voice, Security)
Senior Technical Instructor - IPexpert, Inc.
Telephone: +1.810.326.1444
Fax: +1.309.413.4097
Mailto: ms...@ipexpert.com
--
Join our free online support and peer group communities:
http://www.IPexpert.com/communities
--
IPexpert - The Global Leader in Self-Study, Classroom-Based, Video-On-
Demand and Audio Certification Training Tools for the Cisco CCIE R&S
Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and
CCIE Storage Lab Certifications.
--
On Feb 12, 2009, at 3:51 PM, Alex wrote:
Mike,
COS bits are present only in 802.1Q frames (or ISL, if you are old
enough to remember such thing :-). Whereas I have read somewhere
that recent ATA SW can acquire its Voice VLAN membership via CDP
from the switch and tag the outgoing voice packets with Voice VLAN
tag value I doubt we will see this ATA SW version in the v2 lab. And
there is no ATA in v3 lab anymore.
BTW, I always set the ATA port as access port in Voice VLAN meaning
no 802.1Q tagging and no COS.
HTH
Rgds
Alex
----- Original Message -----
From: Mike Brooks
To: ccie_voice@onlinestudylist.com
Sent: Thursday, February 12, 2009 5:47 PM
Subject: [OSL | CCIE_Voice] ATA COS ?
Does the ATA send a cos value or just DSCP values ? If so, what is
the signaling and media set to by default ? I believe DSCP AF31 for
signaling and EF for media, but what about cos values ?
Thx,
Mike
