Basic QoS config

Hi Guys,

I came up with the bellow doubt in my mind while labing some QoS stuff,
appreciate if you can share your opinion on this
R1 & R2 connected with a 512 Kbps link, We need to gurantee snmp will get
256Kbps in a congested scenario. Between two methods bellow what do you
think most appropriate method? Issue I see with method 2 is bandwidth
command on the interface will not limit the traffic as a result traffic can
go up to the physical interface rate. So I believe option 1 is more
accurate. Please let me know what your openion on this.

*Methos 1*

access-list extended SMTP_TO_SERVER
permit tcp any host any eq smtp

class-map match-all SMTP_TO_SERVER
match access-group name SMTP_TO_SERVER

*policy-map CBWFQ
class class-default
shape-average 512000
class SMTP_TO_SERVER
bandwidth 256
*
interface Serial0/0/0
bandwidth 512
service-policy output CBWFQ

interface Serial0/0/0
bandwidth 512
service-policy output CBWFQ

---------------------------------------------------------------------------------------
*Method 2*

interface Serial0/0/0
bandwidth 512
service-policy output CBWFQ
ip access-list extended SMTP_TO_SERVER
permit tcp any host any eq smtp

class-map match-all SMTP_TO_SERVER
match access-group name SMTP_TO_SERVER

*policy-map CBWFQ
class SMTP_TO_SERVER
bandwidth 256*

interface Serial0/0/0
bandwidth 512
service-policy output CBWFQ

Thanks
Sara

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Received on Sun Mar 10 2013 - 22:43:43 ART