From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Sat Aug 05 2006 - 12:13:08 ART
Hi Bajo.
This is talking from this Book:
End-to-End QoS Network Design By Tim Szigeti - CCIE No. 9794, Christina
Hattingh,
Hope to answer a little bit
Hierarchical Policing
It is advantageous to police some applications at multiple levels. For
example, it might be desirable to limit all TCP traffic to 10 Mbps, while at
the same time limiting FTP traffic (which is a subset of TCP traffic) to no
more than 1.5 Mbps. To achieve this nested policing requirement,
hierarchical policing can be used. Two-level hierarchical policing was
introduced in Cisco IOS Software Release 12.1(5)T. Later, in Release
12.2.1(3)T, three-level hierarchical policing was introduced for the 7200
and 7500 platforms.
The policer at the second level in the hierarchy acts on packets transmitted
or marked by the policer at the first level. Therefore, the second level
does not see any packets that the first level drops. The sum of packets that
the lower-level policers see is equal to the sum of packets that the
higher-level policer transmits or marks. This feature supports up to three
nested levels.
Example 4-4 shows the configuration for the nested, two-level, hierarchical
policing of TCP and FTP traffic.
Example 4-4. Nested, Hierarchical Policing Example
Router# sh run
policy-map FTP-POLICER
class FTP
police cir 1500000
conform-action transmit
exceed-action drop
!
policy-map TCP-POLICER
class TCP
police cir 10000000
conform-action transmit
exceed-action drop
service-policy FTP-POLICER
-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de Bajo
Enviado el: Sabado, 05 de Agosto de 2006 09:52 a.m.
Para: ccielab@groupstudy.com
Asunto: Cascading Traffic
Hi GS,
If a vendor lab asks you to allocate say XXX bps for TCP traffic and YYY bps
for FTP traffic how do you approach the problem:
1. Do I use cascading CBWFQ? Or, CAR with a continue option? Or, does not
matter :)
2. If XXX below (<) YYY
3. If XXX above (>) YYY
The two traffic could be DNS and UDP, TCP and Telnet, TCP and FTP, ...etc
Thanks a lot for any input.
-- Kind Regards,Bajo
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