The MQC commands (class-maps, policy-maps, etc) can only be applied on
ingress with switches. Although, you can also rate limit in the egress
direction as well, just not using the MQC . To rate limit in the egress
direction you can use the following commands:
Lets say you had a 1Gb/s link on interface gig 0/1
config-if# srr-queue bandwidth limit 10
config-if# srr-queue bandwidth shape 25 0 0 0
config-if# srr-queue bandwidth share 30 20 25 25
config-if# no priority-queue out
1) the bandwidth limit statement limits the available bandwidth to 10%
of the link speed (in this case 10% of 1Gb/s is 100 Mb/s).
2) the srr-queue bandwidth shape 25 0 0 0 statements set a maximum of
1/25 (or 4%) of the available bandwidth which results in 4% of 100Mb/s
or 4Mb/s maximum bandwidth for queue 1.
3) the srr-queue bandwidth Shared 30 20 25 25 statement sets a minimum
bandwidth guarentee for queues 2 at 28%, Q3 at 35% and Q4 also at 35% of
the available bandwidth. The % are calculated as follows Q2 =
20/20+25+25 Q3&Q4 = 25/20+25+25
This will result in a maximum of 4Mb/s on Q1, a minimum of 28Mb/s on Q2,
and a minimum of 35Mb/s on Q3 and Q4.
Brian
On 6/29/2011 5:25 PM, Emin Guliyev wrote:
Adam,
I have had the same exact question. As far as I know,
you could only assign bandwidth to inbound priority queue. If someone
sheds a light on this, it would be appreciated.
Thank,
Emin
*From:*ccie_voice-boun...@onlinestudylist.com
[mailto:ccie_voice-boun...@onlinestudylist.com] *On Behalf Of *adam
compton
*Sent:* Wednesday, June 29, 2011 5:43 PM
*To:* <ccie_voice@onlinestudylist.com>
*Subject:* [OSL | CCIE_Voice] 3750 egress priority queue
I've had practice questions that state to guarantee traffic for the
priority queue, but it also says shape queue 1 to 30%. As I would
normally understand it, to enable the priority queue you need the
following command on a port:
priority-queue out
If you use this command SRR shaping and sharing is ignored for the
priority-queue. priority-queue with that command is serviced until
empty, so no srr involved at all. So how can I "guarantee traffic for
the priority queue" while also shaping queue 1 to 30%. Seems like
conflicting statements...
Adam Compton
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_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com
