From: Brian McGahan (brian@cyscoexpert.com)
Date: Tue Jul 15 2003 - 15:06:14 GMT-3
The LLQ does not police all traffic in excess of the configured
rate. Traffic in excess of the configured rate may be sent, but it is
not guaranteed low latency. The policing function of the LLQ only kicks
in when there is congestion on the line. Therefore, traffic in the LLQ
*can* consume the entire bandwidth of a link, but only when there is no
other traffic to be sent, and only traffic up to the configured rate is
dequeued first.
As for the answer to the sample exam question, it depends on
what they are asking specifically. If they want you to police all
traffic as an aggregate to 1Mbps but still provide voice with 128Kbps of
priority, the outer policy should specify the policing while the inner
policy should specify the voice.
An example config would be as follows:
Ip access-list extended VoIP
Permit tcp any any eq 1720
Permit udp any any range 16384 32767
!
class-map VoIP
match access-group name VoIP
!
policy-map OUTER_POLICY
class class-default
police 1000000 187500 375000 conform transmit exceed drop
service-policy INNER_POLICY
!
policy-map INNER_POLICY
class VoIP
priority 128
!
interface Ethernet 0
service-policy output OUTER_POLICY
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Toll Free: 866-CyscoXP
Outside US: 847.674.3392
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Hossam
> Sent: Tuesday, July 15, 2003 11:43 AM
> To: Mustafa Bayramov (ICT/IT); Shane Marquis; 'ccielab@groupstudy.com'
> Subject: RE: Voice QOS question
>
> Mustafa,
> I see it the other way arround. As there is no point (my point of
view) to
> do policying to 1M after priorty to 128 (remember Priority unlike
Bandidth
> does policying by default).
>
> I am thinking of :
>
> class-map match-all voice
> match ip rtp 16384 16383
> policy-map policing
> class class-default
> police 1000000 187500 375000 conform-action transmit exceed-action
drop
> service-policy main
>
> policy-map main
> class voice
> priority 128
>
>
> "Mustafa Bayramov (ICT/IT)" <mustafa@azercell.com> wrote:
> class-map match-all voice
> match ip rtp 16384 16383
>
> policy-map policing
> class class-default
> police 1000000 187500 375000 conform-action transmit exceed-action
drop
>
> policy-map main
> class voice
> priority 128
> service-policy policing
>
>
> What about this ?
>
> Regards
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Shane Marquis
> Sent: Tuesday, July 15, 2003 1:42 AM
> To: 'ccielab@groupstudy.com'
> Subject: Voice QOS question
>
> All,
>
> I hope this is not a stupid question, but as I've always been told -
there
> are no stupid questions only stupid people so here goes :-)
>
>
>
> I have a question on a sample exam that asks me to give a priority
queue
> of
> 128kb/s to voice but then goes on to ask for me to limit the outgoing
> traffic to 1mb/s - the outgoing interface is Ethernet.
>
> I have configured a service policy giving 128kb/s but I am unsure how
to
> then limit the traffic to 1mb/s I've been unable to find a solution on
> CCO.
> Can anyone offer any ideas?
>
>
>
> Shane
>
>
>
This archive was generated by hypermail 2.1.4 : Wed Aug 06 2003 - 06:52:40 GMT-3