QoS - packets arriving on the interface

[kunal-united]

Hi,

In have a cisco 2801 router, fast 0/0 - internal network and fast 0/1 - internet

I have packets coming into fast 0/0 with dscp values ef, cs3, cs5, etc ... going the the internet thru fast 0/1.

I only have basic configuration on fast 0/1 - no service-policy, no class-map, configured

Scenario: packets with dscp values arriving in fast 0/0 will exit fast 0/1 to the internet.

Question: Will these packets will be tagged the same dscp values when they exit to the internet?

Is this true or do I have make some configuration changes at my end to have this scenario configured.

Please provide reference. All are fastethernet interfaces.

class-map match-any VoIP-Signalling

match ip dscp af31

match ip dscp cs3

match ip dscp cs5

class-map match-any VoIP

match ip dscp ef

!

!

policy-map VOIP-QoS

class VoIP-Audio

priority 2500

class VoIP-Sig

bandwidth 100

class class-default

fair-queue

[Edison Ortiz · Accepted solution]

Question: Will these packets will be tagged the same dscp values when they exit to the internet? 

The tags will be preserved as they traverse the router unless you create a policy that alters it.

do I have make some configuration changes at my end to have this scenario configured.
Please provide reference. All are fastethernet interfaces.
class-map match-any VoIP-Signalling
match ip dscp af31
match ip dscp cs3
match ip dscp cs5
class-map match-any VoIP
match ip dscp ef
!
!
policy-map VOIP-QoS
class VoIP-Audio
priority 2500
class VoIP-Sig
bandwidth 100
class class-default
fair-queue

Your policy-map is not configured properly.

class VoIP-Audio != VoIP

class VoIP-Sig != VoIP Signalling

You have to make sure whatever name used in the class-map matches the class used under the policy-map.

Regards,

Edison