[c-nsp] Priority Queueing

[Oliver Boehmer (oboehmer)]

Steve,

please use the new MQC-way to configure LLQ instead of legacy PQ. I'd do
something like this:

ip cef
!
class VOICE
 match access-group 110
 ! or match on ip precedence right away
class MEDIUM
 match access-group 111
...

policy-map OUTQOS
 class VOICE
  priority percent 10
 class MEDIUM
  bandwidth percent 20
...
 class class-default
  random-detect

int serial0
 bandwidth 2048
 service-policy output OUTQOS

this reserves 10 percent of your bandwidth for voice which will get
priority treatment. For the other classes, you will be able to guarantee
a minimum-bandwidth for each, but each class can get more if they need
it. on all other traffic, you perform wred (as an example).

Please check QoS configuration guides on CCO for the glory details.

	oli

Steve Van Eck <> wrote on Monday, October 17, 2005 3:59 PM:

> I am trying to implement Priority Queuing on my network. The config
> is as follows:
> 
> priority-list 1 protocol ip high list 110
> priority-list 1 protocol ip medium list 111
> priority-list 1 protocol ip normal list 112
> priority-list 1 default lo
> 
> 
> 
> access-list 110 remark QOS hi (voip)
> access-list 110 permit ip host yyy.yyy.yyy.1 any dscp ef       !voip
> server 1
> access-list 110 permit ip host yyy.yyy.yyy.2 any dscp ef       !voip
> server 2
> access-list 111 remark QOS medium (web)
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 111 permit ip host zzz.zzz.zzz.zzz host xxx.xxx.xxx.xxx
> precedence flash-override
> access-list 112 remark QOS normal (web)
> access-list 112 permit ip ttt.ttt.ttt.ttt any precedence flash
> 
> int s0/1
> priority group 1
> 
> 
> zzz.zzz.zzz.zzz is the ip of my serial interface.
> xxx.xxx.xxx.xxx are ipsec connection with sites.
> yyy.yyy.yyy.1 are voip servers
> ttt.ttt.ttt.ttt  is the range my webservers are on.
> 
> 
> My traffic in order of precedence should be:
> 1.	VOIP
> 2.	IPSEC with outlying sites
> 3.	Webservers
> 4.	All other traffic low ( mail, outgoing web browsing)
> 
> 
> 
> I must have something fundamentally wrong with this config, when
> applied the quality of the VOIP goes down dramatically and my "Total
> Output Drops" rises substantially.  Can someone please point out the
> error of my ways? And is there a way to log what the output drops are?
> 
> Thanks for your time,
> 
> Steve Van Eck