Re: Voice Traffic

Hello Experts,

Adam you are right regarding the parent/child thing..Kazi this means you
need to apply a hierarchical policy of the form

policy-map INNER_POLICY
class VOIP
priority <upper limit>
exit

policy-map OUTER_POLICY (Shape to the agreed rate with the ISP)
class class-default
shape average
service-policy INNER_POLICY
exit

int fa0/0.XYZ (interface connected to ISP)
service-policy OUTER_POLICY

As for matching Voice traffic, as per my knowledge you can match the RTP
stream however the guys may be right..However there is no harm in matching
DSCP/COS values (DSCP 40/46) and COS 5 for instance in the class-map.

HTH,

Karim
On Mon, Sep 6, 2010 at 2:23 AM, Kazi Junaid <junaidkazi76_at_gmail.com> wrote:

> Hi,
>
> Does this looks ok?
>
> Voice_Gateway : 10.255.1.100/24
> access-list 100 permit udp host 10.255.1.100 any range 16384 32767
>
> class-map match-all VG
> match ip access-group 100
>
> policy-map VG
> class VG
> priority percentage 60
> class class-default
> fair-queue
>
>
> int f 0/0.99
> service-policy output VG
>
>
>
>
>
> On Mon, Sep 6, 2010 at 2:20 AM, Ryan West <rwest_at_zyedge.com> wrote:
>
>> Kazi,
>>
>> > -----Original Message-----
>> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
>> > Behalf Of karim jamali
>> > Sent: Sunday, September 05, 2010 7:05 PM
>> > To: Kazi Junaid; Cisco certification
>> > Subject: Re: Voice Traffic
>> >
>> > Hi Kazi,
>> >
>> > I guess you are looking for LLQ solution and what it does is the
>> following:
>> > 1.Gives priority to voice traffic by putting it inside a priority queue
>> which gets
>> > serviced first.
>> > 2.You wouldn't want your voice traffic to kill other applications, thus
>> you will
>> > need to put an upper limit to this prioritized traffic, i.e. you are
>> saying I will
>> > guarantee voice is service first with an upper limit of 1Mbps, if this
>> limit is
>> > exceeded, well it depends on how the link is doing, if it is fine than
>> than you
>> > will still have it working perfectly, if the link is congested, you are
>> only
>> > guaranteed up to 1Mbps of excellent service, more than that you will
>> lose
>> > the guarantee.
>> >
>> > Steps:
>> > 1.You will need to match the traffic which I guess is the RTP (udp 16384
>> > 32767)
>>
>> Assuming this a standards based VoIP solution, you could match on protocol
>> RTP audio, DSCP 40/46, or ACL that specifies voice IP ranges and the UDP
>> range listed above.
>>
>> However, above this all this, you need to work with your MPLS provider to
>> ensure they are treating your voice as a gold/real-time/insert your favorite
>> most expensive marketing term for priority traffic here. You can queue
>> outbound as much as like, but if your provider isn't doing the same it could
>> be in vain
>>
>> For LLQ:
>>
>>
>> http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfwfq_ps1835_TSD_Products_Configuration_Guide_Chapter.html#wp1022204
>>
>> From a carrier's perspective:
>>
>>
>> http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBIQFjAA&url=http%3A%2F%2Fwww.globalcrossing.com%2Fdocs%2Fipkc%2Fmpls_qos.ppt&ei=ViWETOjLB4L88Abs_6nzAQ&usg=AFQjCNGr2ego_xozF_67wXLO7RUwGVrmWw
>>
>> -ryan
>>
>
>

-- 
KJ
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