From: Greg Wendel (gwendel@gmail.com)
Date: Sun Feb 24 2008 - 19:31:46 ARST
Thanks Marvin,
That is exactly what I was looking for.
On Sun, Feb 24, 2008 at 4:16 PM, <mgreenlee@ipexpert.com> wrote:
> Regarding T1 bandwidth, my "opinion" isn't the one that matters, the
> "opinion" of their answer key is what matters. J
>
>
>
> This would be an excellent example of when to ask the proctor for
> clarification. Make sure that you question demonstrates an understanding of
> the technologies, perhaps something like.
>
>
>
> "The question states to use T1 speeds", are you looking for the commonly
> used rate of 1544K, or the rate of 1536K, which excludes the 8k in framing
> bits.
>
>
>
> Marvin Greenlee, CCIE #12237 (R&S, SP, Sec)
> Senior Technical Instructor - IPexpert, Inc.
> A Cisco Learning Partner - We Accept Learning Credits!
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
>
> Mailto: mgreenlee@ipexpert.com
>
>
>
> IPexpert - The Global Leader in Self-Study, Classroom-Based, Video On
> Demand and Audio Certification Training Tools for the Cisco CCIE R&S Lab,
> CCIE Security Lab, CCIE Service Provider Lab, CCIE Voice Lab and CCIE
> Storage Lab Certifications.
> ------------------------------
>
> *From:* Greg Wendel [mailto:gwendel@gmail.com]
> *Sent:* Sunday, February 24, 2008 1:05 PM
> *To:* mgreenlee@ipexpert.com
> *Cc:* Todd, Douglas M.; Radioactive Frog; Cisco certification; ccie forum
> *Subject:* Re: Frame-relay trafic shaping
>
>
>
> Marvin,
> Thanks for the good info. Could you tell me your opinion on whether to
> use
>
> int serial x/x
> bandwidth 1536
> or
> int serial x/x
> bandwidth 1544
>
> when asked to specify T1 speeds on a QOS task?
>
> Thanks,
>
> On Fri, Feb 22, 2008 at 9:38 PM, <mgreenlee@ipexpert.com> wrote:
>
> Slight correction
>
> 1. Applying QoS to a circuit doesn't "take" 75% of the bandwidth.
>
> The limitation of the max-reserved is to prevent someone from applying a
> policy that is asking for a value higher than the max-reserved value. The
> max-reserved value only affects whether or not your policy can be applied
> to
> the interface, it doesn't affect the calculation.
>
> So if you have a policy asking for 20%, and someone set your max reserved
> to
> 30%, the 30% is not used in the calculation, and only comes into play if
> your policy was asking for more than 30%, in which case, the router gives
> you a nice message, and doesn't take the command when you try to apply the
> policy to the interface.
>
> (Also, to be specific, bandwidth is reserved in policy-map statements, not
> class-map statements)
>
> The value could be from CIR, or it could be from line rate, I would expect
> them to tell you in the question.
>
> As mentioned before, make sure that your interface bandwidth matches the
> bandwidth of the circuit. With a serial line default of 1544, if the
> actual
> circuit is only 128k, then a reservation of 10% can overwhelm the circuit,
> as the router "thinks" that 154k is 10%
>
> However, the answer also is "it depends". There were some IOS versions
> between 12.1t and 12.2 / 12.2T where they changed things around a bit, and
> some versions actually did the calculations based on the 'max-reserved'
> value, so asking for 20% with max-reserved set to 75% would really
> allocate
> 15%. So if you're on a device with an older IOS version, the results may
> vary a bit from what the newer code will do. Make sure to take a close
> look
> at your show commands - show policy-map int, etc. to see what the router
> is
> telling you.
>
>
>
>
>
>
>
>
>
> Marvin Greenlee, CCIE #12237 (R&S, SP, Sec)
> Senior Technical Instructor - IPexpert, Inc.
> A Cisco Learning Partner - We Accept Learning Credits!
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> Mailto: mgreenlee@ipexpert.com
>
> IPexpert - The Global Leader in Self-Study, Classroom-Based, Video On
> Demand
> and Audio Certification Training Tools for the Cisco CCIE R&S Lab, CCIE
> Security Lab, CCIE Service Provider Lab, CCIE Voice Lab and CCIE Storage
> Lab
> Certifications.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Todd, Douglas M.
> Sent: Thursday, February 21, 2008 12:56 PM
> To: Radioactive Frog; Cisco certification
> Cc: ccie forum
> Subject: RE: Frame-relay trafic shaping
>
> Hmm -- some light heading your way I hope and not a dark spot...
>
>
> Some correct me if I'm incorrect:
>
> When you apply QoS to a circuit it takes 75% of the bandwidth, 25% is set
> for
> control and IGP (etc). If you need to reserve %20 percent, I would assume
> that
> it's 20% of the interface bandwidth, thus a max-bandwidth statement must
> be
> applied. Then you are taking %20 of the interface bandwidth and not %20 of
> %75
> of the interface bandwidth.
>
> Thus you are working with 75% of the interface bandwidth (sh int | i BW)
> (no
> max-bandwidth statement).
>
> Q2: If you are not using max-bandwidth then its %20 of the %75 interface
> BW.
> CIR
> is just the threshold of where you want the DE bit to be set. But
> obviously
> it's
> part of the Bc/Be formulas.
>
> Douglas
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Radioactive Frog
> Sent: Wednesday, February 20, 2008 7:13 PM
> To: Cisco certification
> Cc: ccie forum
> Subject: Frame-relay trafic shaping
>
> FRTS question folks,
>
> Q1. in QoS class-map statement, if we have to reserve 20% bandwidth - will
> that
> be calculated from Frame-relay CIR???? (CIR=95% of BW). I am not sure....
>
> Q2. Also if we have to allocate 20% bandwidth for signaling traffic -
> will
> that
> be calculated from CIR? or Total Bandwidth?
>
> can someone shed some light on this please....
>
>
> Frog
>
>
> interface Serial6/0
> description Parent FR Link for BRANCH#60 no ip address encapsulation
> frame-relay
> frame-relay traffic-shaping !
>
>
> interface Serial6/0.60 point-to-point
> description FR Sub-Interface for BRANCH#60 bandwidth 256
>
> frame-relay interface-dlci 60 ppp Virtual-Template60 ! Enables MLPoFR
> class
> FRTS-256kbps ! Binds the map-class to the FR DLCI
>
>
>
> !
> interface Virtual-Template60
> bandwidth 256
> ip address 10.200.60.2 255.255.255.252
> service-policy output WAN-EDGE ! Attaches MQC policy to map-class ppp
> multilink
> ppp multilink fragment-delay 10 ! Enables MLP fragmentation ppp multilink
> interleave ! Enables MLP interleaving !
>
> !
> map-class frame-relay FRTS-256kbps
> frame-relay cir 243200 ! CIR is set to 95% of FR DLCI rate frame-relay bc
> 2432 !
> Bc is set to CIR/100 frame-relay be 0 ! Be is set to 0 frame-relay mincir
> 243200
> ! MinCIR is set to CIR
>
>
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> --
> Gregory Wendel
> Springfield VA, 22153
>
-- Gregory Wendel Springfield VA, 22153
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