CCIE Pursuit Blog

October 30, 2008

Question Of The Day: 30 October, 2008

The WordPress polling application seems to be down at the moment, so I’ll unleash the first of the Friday Questions of the Day one day early:

Your co-worker has been tasked with limiting the amount of traffic inbound on interface fa0/0 from a device with the MAC address of 11-11-22-22-33-33 to 5Mbits/second.  Your boss has just informed him that there is more than 20Mbits/second inbound on that port from the device with that MAC address.  He turns to you and asks you to look at his configuration:

interface FastEthernet0/0
 rate-limit input access-group 100 5000000 2500 2500 conform-action transmit exceed-action drop
!
access-list rate-limit 100 1111.2222.3333

Why are you receiving significantly more than 5Mbps inbound on interface f0/0 from the device with the MAC address of 1111.2222.3333?

—–

Yesterday’s QoD:

Which of the following is NOT a shaping feature supported by Cisco IOS?

Here are the results:

Answer %
Flow-Based Traffic Shaping (FBTS) 64%
Class-Based Shaping 18%
Generic Traffic Shaping (GTS) 16%
Frame Relay Traffic Shaping (FRTS) 2%

The answer: Flow-Based Traffic Shaping (FBTS)

For traffic shaping, Cisco IOS QoS includes Generic Traffic Shaping (GTS),Class-Based Shaping, and Frame Relay Traffic Shaping (FRTS). These features allow you to regulate packet flow (that is, the flow of traffic) on your network.

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1 Comment »

  1. $BOSS forgot to add the rate-limit keyword when referencing the access-list thus referencing a regular ip access-list number 100.

    The correct configuration would be:

    interface FastEthernet0/0
    rate-limit input access-group rate-limit 100 5000000 2500 2500 conform-action transmit exceed-action drop

    access-list rate-limit 100 1111.2222.3333

    Reference found here:
    http://www.cisco.com/en/US/docs/ios/12_2/qos/command/reference/qrfcmd1.html#wp1017391

    -Brandon Bennett

    Comment by nemith — October 30, 2008 @ 2:30 pm | Reply


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