[cisco-voip] QoS for Day to Day traffic

[Brantley Richbourg]

Hello,
 
I have some thoughts on your policy-map.
 
You are not going to get 8 Mbps on your day2day class.  First off, you
give 3% priority to voice, which leaves 97Mbps remaining.  The next
class  in your policy-map (DR) is saying to use 89% of the remaining
97Mbps (84.39Mbps), and finally you have day2day traffic can have 8% of
the remaining BW.  So your DR replication I assume will be using a good
bit of bandwidth all day long, so you are only going to get 157Kbps for
DR traffic (if DR and Voice are using 100% of what they can get),
because the "remaining" keyword tells the IOS to allocate that
percentage of bandwidth that has not been allocated to other classes.  I
would do this:
 
policy-map DRandVoice
 class voice
  priority percent 3
 class day2day
  bandwidth percent 8
 
Your DR traffic will hit the "class-default" will be get the rest of the
pipe if both classes are being matched on.  That will give you 89% for
DR, 8% for day2day and 3% for voice (LLQ).
 
More information here:
http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a
0080103eae.shtml#summaryofdifferences
 
Thanks,
 
Brantley
 
Brantley Richbourg, MCSE, CCNAS, VCP
Network Engineer
Medical Mutual Insurance Company of North Carolina
919.878.7564 
919.878.7550 (F)
Brantley.Richbourg at mmicnc.com
www.medicalmutualgroup.com
    

________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Kevin Dunn
Sent: Monday, October 12, 2009 10:41 AM
To: Cisco Voice
Subject: [cisco-voip] QoS for Day to Day traffic


Hello my Pundits
 
I have a 100Meg Ethernet WAN connection between two towns for DR
purposes, and we are going to run "day to day" traffic (voice and data)
over this circuit as well, now when replication and SAN to SAN traffic
hits I don't want it to mess with the "day to day" traffic.   The DR
traffic will either source or destination to 10.31.0.0.  So I made a
couple of ACL's to match that IP to.  The end result is I want to voice
traffic to have priority and 3Megs of bandwidth, Day to Day traffic
around 8 Megs of traffic and DR (San to San) the remaining 89%.... 
 
1.  Do you think this will work?
2.  Do you think it is set up right?
 
 
 
class-map match-any voice
 match  dscp ef 
 match protocol rtp audio 
class-map match-any DR
 match access-group 100
class-map match-any day2day
 match access-group 101
 
policy-map DRandVoice
 class voice
  priority percent 3
 class DR
  bandwidth remaining percent 89
 class day2day
  bandwidth remaining percent 8
 
access-list 100 permit ip 10.31.0.0 0.0.255.255
access-list 101 deny ip 10.31.0.0 0.0.255.255
access-list 101 permit ip any any

 
 
 
Kevin Dunn
Marathon Cheese Corporation
 


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