From: Pavel Bykov (slidersv@gmail.com)
Date: Sat Dec 13 2008 - 18:23:02 ARST
I think it's not possible to configure Tc lower than 10ms.
As far as I can remember, with such configuration "show policy-map
interface" showed bogus results.
Can you post show policy-map with such config? In #4 output you sent the tc
is 10ms.
On Sat, Dec 13, 2008 at 3:01 AM, Ivan Walker <ivan@itpro.co.nz> wrote:
> 1. When shaping using MQC on a interface that also passes VoIP traffic
> (priority queuing of voice traffic via child policy) what are the pros and
> cons of using a Tc of 4ms (minimum possible as far as I understand) compared
> with a Tc of 10ms (Cisco recommended value for voice in some documents I
> have seen). For example the impact on CPU or possible delay.
>
> 2. If shaping is configured as follows how are packets larger than Bc
> accommodated? (no interleaving configured).
>
> CIR = 1000000bps
> Bc = 4000bits (500bytes)
> Be = 0
> Tc = 4ms
>
> 3. Again with the above shaping configuration, if only packets of size
> 400bytes were sent does that mean it will never be possible to utilise the
> full 1000000bps but rather only 400/500 * 1000000 = 800000bps?
>
> 4. Using IOS 12.4.13b it was possible to see the stats for delayed packets
> and other values such as Tc.
>
> router#show policy-map interface gi0/0
> GigabitEthernet0/0
>
> Service-policy output: SHAPE
>
> Class-map: class-default (match-any)
> 7522946 packets, 1961480754 bytes
> 30 second offered rate 66000 bps, drop rate 0 bps
> Match: any
> Traffic Shaping
> Target/Average Byte Sustain Excess Interval Increment
> Rate Limit bits/int bits/int (ms) (bytes)
> 5000000/5000000 6250 50000 0 10 6250
> Adapt Queue Packets Bytes Packets Bytes Shaping
> Active Depth Delayed Delayed Active
> - 0 7518711 1956530048 118002 129484844 no
>
> I can't seem to get the same stats from 12.4.22T
>
> router#show policy-map interface fa0/0 output
> FastEthernet0/0
>
> Service-policy output: SHAPE
>
> Class-map: class-default (match-any)
> 13 packets, 2184 bytes
> 30 second offered rate 0 bps, drop rate 0 bps
> Match: any
> Queueing
> queue limit 64 packets
> (queue depth/total drops/no-buffer drops) 0/0/0
> (pkts output/bytes output) 13/2366
> shape (average) cir 3000000, bc 12000, be 12000
> target shape rate 3000000
>
> Any ideas?
>
> Thanks
>
> Ivan
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>
-- Pavel Bykov ---------------- Don't forget to help stopping the braindumps, use of which reduces value of your certifications. Sign the petition at http://www.stopbraindumps.com/Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Thu Jan 01 2009 - 12:53:08 ARST