Kobel,
In my opinion, you should only retain the "frame-relay ip rtp
header-compression" under the frame-relay DLCI if you are asked to
compress the rtp packets. Because we're dealing with a slow-speed link,
auto qos tries to be helpful by adding in this command.
My general stance when it comes to answering the QoS lab questions is to
only configure what they ask you to setup. Using auto qos is helpful to
rough-in a configuration, but leaving in unnecessary elements does not
demonstrate a mastery of the knowledge you are being tested on. I will
provide another example:
When you type "auto qos voip" several classes will be created. One of
those classes, called something like "remark," will set DSCP values on
so-called rogue traffic masquerading as media or signaling traffic. If
the question does not ask you to perform that task, you'll want to
remove the remark class.
I'm not sure if this helps, but it's my take on the subject. My guess
is that the lab would be specific whether they wanted class-based cRTP
or not.
*Matthew Berry*
/A+, CCENT, CCNA, CCNA Voice, CCVP, CCIE Voice Written/
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Cisco Cert Journey Began: Jan 1, 2009
1st Lab Attempt: Aug 16, 2010
On 6/15/2010 4:23 AM, kobel wrote:
Also, after the Auto QOS generates a lot of classes etc. We do
edit few things here and there. Just wanted to confirm that is it
a good practice to remove rtp header compression?
I use to remove it always but now I am getting conflicting
feedback that should we remove it or not?
interface Serial0/2/0.1 point-to-point
bandwidth 256
frame-relay interface-dlci 301 CISCO
class AutoQoS-FR-Se0/2/0-301
auto qos voip trust
* frame-relay ip rtp header-compression*
I would appreciate any input in this regard.
you can configure cRTP in two ways. if the task doesn't explicitly ask
for CB cRTP, I keep auto qos config - why waste time? I'm not aware of
any drawback of this method.
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