From: Scott Morris (swm@emanon.com)
Date: Thu Dec 18 2003 - 20:57:17 GMT-3
The difference is REQuested versus ACCeptable quality of service.
The three levels are:
Guaranteed-delay - uses RSVP to indicate bandwidth as well as
preferential treatment
Controlled-load - uses RSVP as well but presumes that bandwidth may be
statistically overloaded (single preference)
Best-effort - Indicates that RSVP makes no guarantees (default)
So I may ask for guaranteed-delay (best), but accept best-effort.
That's the default method which allows your call to take place even
without the RSVP session (you need gatekeeper to prohibit). Otherwise,
if you set it to request guaranteed delay, and accept controlled load,
if RSVP can make no guarantees, then the call will not be placed.
So if you NEED to make sure that a call goes through, and that if
reservable bandwidth is not available, to ensure you will not make the
call (no sense having crappy connectivity), then use acc-qos to set a
minimum acceptable level of guarantee for that particular dial peer.
You can also use this with your preference commands to create multipath
capabilities for your voice traffic. While one path may be technically
reachable, it may become undesireable.
Hope that helps.
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
CISSP, JNCIS, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Soup Shi
Sent: Thursday, December 18, 2003 6:44 PM
To: ccielab@groupstudy.com
Subject: req-qos vs. acc-qos
Hi, group,
I thought they are combination commands, however, I was wrong when I
tried
to test it yesterday.
It seems the command req-qos works really well and rsvp bandwidth is
reserved when I picked up the phone. However, the acc-qos does not. What
is the difference between the two commands? The document cd does not
help.
Thanks in advance.
Soup
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