We run auto qos in a few sites aorund the place, mainly on 2960s.
On IOS version 12.2(25)FX after you enter the auto quos voip trust command, it puts the srr-queue bandwitdh share and srr-queue bandwidth shape commands under each interface.
I recently deployed an new 2960 running 12.2(53)SE2. after entering the auto qos voip trust command i noticed that the srr-queue bandwidth shape command is missing from the interface config. Only the bandwidth share command is there.
Also the command show mls qos interface queuing shows that the shaped queue weights is now 25 0 0 0 where in earlier versions it was 10 0 0 0
So, with the new version, is shaping enabled on the interface, even though the command is not specifically applied to the interface. If not, does it need to be manually typed in?
The final 0 0 0 in the shape command means that the other 3 queues do not operate in shaped mode, but are in shared mode.
If Priority queue is enabled queue 1 gets all the bandwidth if there is a packet in that Q. So there is no point in having shape command with priority-queue out command enabled.
if you look again the older version did not have "priority-queue out" enabled when you turn on quto qos. Hence they had share and shape command turn on, now they enable "priority-queue out" with auto qos hence shape is out.
It is always good that queues operate in shared mode. so you do have to enable anything at this point.
When you use the shape command you gurantee the % bandwidth that you mention in the shape command, ideally you give some value to queue 1 which is the priority queue where your voice-traffic maps (with out the priority-out command its just another queue) this is to make sure that the voice traffic gets the enough bandwidth all the time and share the remaining bandwidth among the other 3 queues.
priority-queue out gives you the best (low) jitter and latency.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...