Tc minimum QoS vs Task working vs Lab

Hi list,

Task: Adjust policy so that Tc is minimum.

For Tc, 4ms, or 10 ms?

Service-policy output: TESTPOL

Class-map: class-default (match-any) 1 packets, 24 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: any Traffic Shaping Target/Average Byte Sustain Excess Interval Increment Rate Limit bits/int bits/int (ms) (bytes) 512000/512000 512 2048 2048 4 256

Example is INE lab solution guide says 10ms (via setting the Bc) I think 4ms is less then 10, but 10 is the “optimal” often quoted.

Of course I would ask the proctor but this is playing on my mind, so im wondering what the group thinks.

Cheers

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This entry was posted on Friday, October 2nd, 2009 at 11:37 am and is filed under Cisco. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

  1. Nathan Richie says:
    October 3, 2009 at 3:40 pm

    According to Cisco’s website, 10ms is minimum Tc – http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a00800d6788.shtml#frame_rel_traffic

    However, with distributed traffic shaping on the 7500, 4ms is the minimum Tc – http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800a3a25.shtml

    “The range for Tc is between 10 ms and 125 ms. With distributed traffic shaping (DTS) on the Cisco 7500 series, the minimum Tc is 4 ms.”

    Hope this helps!

    Regards,

    Nathan Richie

  2. Iwan Hoogendoorn says:
    October 3, 2009 at 10:02 pm

    Just like Nathan said … 10ms is minimum TC

  3. Martin Hogan says:
    October 4, 2009 at 2:07 am

    Thanks Iwan, Nathan for the posts.

    Just as a side note, for anyone searching, the device im using is an emulated 3600 but the same output was achieved via INE racks 2611.

    I guess I should ask the proctor “Should I set Tc to the actual minimum, or what the website says is the minimum?”

    Cheers, Martin

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