Pages

1/16/2009

Change priority of DNS SRV records

 
 
 

 


IRS Circular 230 disclosure: To ensure compliance with requirements imposed by the IRS, we inform you that any tax advice that may be contained in this communication (including any attachments) is not intended or written to be used, and cannot be used, for the purpose of (i) avoiding any penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction(s) or tax-related matter(s) that may be addressed herein.

 

This e-mail communication (including any attachments) may contain legally privileged and confidential information intended solely for the use of the intended recipient. If you are not the intended recipient, you should immediately stop reading this message and delete it from your system. Any unauthorized reading, distribution, copying or other use of this communication (or its attachments) is strictly prohibited.

1/05/2009

Application
       Layer
 3
Classification
Layer 2 COS
 
IPP
PHB
DSCP
 
IP Routing
6
CS6
48
6
Voice
5
EF
46
5
Interactive Video
4
AF41
34
4
Streaming Video
4
CS4
32
4
Critical Application
3
AF31
26
3
Call-Signaling
3
CS3
24
3
Network-Management
2
AF21
18
2
Bulk Data
1
AF11
10
1
Scavenger
1
CS1
8
1
Best Effort
0
0
0
0
 
 
 
 
 
 

Below is an example of a  quick start quality of service configuration.  We will walk through this configuration over the phone.

 

Apply the below under global configuration mode:

 

Config t

 

class-map match-any Voice
 match ip dscp ef

class-map match-any Routing

  match ip dscp cs6

class-map match-any Call-Signaling

  match ip dscp cs3



policy-map QOS
 class Voice
  priority percent 5
 class Routing
  bandwidth percent 5

class Call-Signaling

   bandwidth percent 5
 class class-default
  bandwidth percent 60

  queue-limit 256

 

Then apply the qos policy, in the outbound direction, to the interface:

 

interface "interface-name"

service-policy output QOS

 

We set DSCP CS3 for call-signaling. Some older devices use AF31 instead.  If this is the case then add AF31 to your call-signaling class-map.

 

class-map match-any Call-Signaling

  match ip dscp cs3

  match ip dscp af31

 

 

Also please reference the Cisco Solutions Reference Network Design (SRND) Guide for specific questions to best practice deployments within the enterprise.  Please click on the link below to access our SRND for QOS.

 

 

http://www.cisco.com/univercd/cc/td/doc/solution/esm/qossrnd.pdf