ME3600X queue buffer utilization

[Octavio Alfageme]

Dear all,

We are running IOS15.3(1) in our ME3600Xs. In some cases we are using the following feature to avoid drops in ME3600X queues due to microbursts:

   Egress default queue limit improvement and percent bandwidth support—QoS feature to increase QoS Buffer depths and default queue limits on the Cisco ME 3800X/ME 3600X. The feature allows setting queue limits as a percentage of the total buffer pool. For details about using this feature, see:

http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.3_1_S/configuration/guide/swqos.html

It's really useful to avoid annoying drops in the customer facing queues.

However, I would like to follow the utilization level of the whole 22MB buffer pool (18MB for queues) that each ASIC has. I would be grateful if somebody could tell me the command to verify it, as I haven't been able to find it.

Thanks in advance

Regards

Octavio

[Adam Vitkovsky]

Dear Octavio,

The only thing I've found is:

sh platform tcam utilization qos det

and

sh platform tcam utilization eqos det

But I don't really understand the outputs

adam

[Octavio Alfageme]

Thank you, Adam. You are right, under the "show platform" tab there is a lot of information, but I haven't found how to interpret it.

I'm attending Cisco Live in Milan next month. Hopefully I'll improve my knowledge of the ME3600Xs. ;-)

Once again, thanks a lot for your help

Octavio

[joshuacmoore]

I have been told that the 3600/3800 have a single ASIC. I went through a lot with Cisco TAC on this stuff.

What I do is set the buffer up to 1mb for ports that tend to have bursty traffic.

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[Octavio Alfageme]

Thank you, Joshua. I take note of the recommendation.

Thank you

Octavio

[mtsb]

But increasing the queue limit might possibly delay the traffic. Yes, ME switches has acutally 2 ASIC called NILE0/NILE1 and they are similar to EARL asic in 6500/7600. When we execute the show platform CLI they will get outputs from NILE asic which is presented in a very different format and it is not very intuitive. If we get to know what exactly to look for and ignore other fields there will be no confusion.

Thanks,

Madhu

[joshuacmoore]

You either drop or delay the traffic or in some cases tell the transmitter to hold off.

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[mtsb]

Yes thats right. If I have voice traffic passing through I wouldn't recommend this increasing to a high value!

Thanks,

Madhu

[joshuacmoore]

If that's a concern then you can always classify the voice traffic and police it accordingly.

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