[c-nsp] ME3600 IOS / SPAN

[Tassos Chatzithomaoglou]

We migrated from ME-3400 to ME-3800X and we noticed that we started getting output drops 
on 1G interfaces, while the traffic was ~700 Mbps.
I know about bursts and so on, but the same traffic wasn't causing any drops on the older 
platform.
We tried some output shaping service policies under the interface, but the drops were 
still there, and then on the policy-map too.
We also noticed that the rate counters on the policy-map were totally wrong.
Then we applied shaping service policies under the service instances and increased the 
queue-limit to the max available, and the drops got very low (but still existent).
Tac concluded that this is due to the default egress buffers being too small, and we're 
waiting for the developers to come up with a solution.
Another issue we met, is that any match of non-default classes under the service policies 
under the service instances wasn't working at all, when there was no ingress L2 control 
traffic from the other side. I know it sounds very strange, but this was the conclusion we 
came to, after doing many different tests.

To summarize, we have quite a few of strange cases with tac on this platform.

--
Tassos


Nick Hilliard wrote on 22/11/2011 22:29:
> On 22/11/2011 18:44, Tassos Chatzithomaoglou wrote:
>> Unfortunately there are still a lot of features missing + some things that
>> don't work well (primarily the -hardcoded- small egress buffers)
> Can you elaborate on this?
>
> Nick
>