class-map + IP precedence

Unanswered Question
Jun 13th, 2008
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Hi Guys,

I'm configuring my router to guaranteed minimum bandwidth of 512K for all traffic leaving E0/0 of R3 with IP Precedence 2.

solution I:

On R3

class-map match-all Pr2

match input-interface Ethernet0/0

match ip precedence 2

policy-map P1

class Pr2

bandwidth 512

interface Ethernet0/0

service-policy output P1

solution II:

on R3

all config the same except match precedence 2 instead of match ip precedence 2.

what's the diffrence between both statements!!

--> match ip precedence 2

--> match precedence 2

which solution is the most correct !!

appreciate any helpful inputs..

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Jon Marshall Fri, 06/13/2008 - 13:36
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match precedence = matches both IPv4 & IPv6 packets

match ip precedence = matches IPv4 packets only.

One other thing. If you are matching traffic leaving e0/0 why the "match input-interface e0/0" ?


balsheikh Sun, 06/15/2008 - 10:07
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Hi Jon,

it make scenes now, do u thing "match input-interface e0/0" command isn't required to achieve the goal !!



thotsaphon Sun, 06/15/2008 - 10:13
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You are trying to use congestion management method and the policy is applied to the e0/0 interface for doing outbound queuing. It's not properly to match inbound packets from the e0/0 interface.

Note: If the interface doesn't get congestion then the policy will not be applied.It's not easy to make the ethernetinterface to get congestion.Seems you need to use shaping and child-policy to beat this requirement.



balsheikh Wed, 06/18/2008 - 23:12
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Hi Thot,

u r right It's not easy to make the ethernet interface to get congestion but I just configured it for testing purpose to figure out if this is only required config commands to achieve the requirement.

it seems as u had said no need to match the physical interface.

many thx..


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