qos issue

[chenleish]

if one of my customers want to qos and wish I can guarantee all of his application to go around in my network. can I promise him? I think i can only assure his outside traffic , i can mark it and do some qos policy, but for inside trafiic , I have no way to do. right?

[thisisshanky]

Traffic going outbound can be definitely guaranteed during congestion using CBWFQ or LLQ. You can even classify packets and mark packets based on DSCP or IP. Typically you apply this policy on the outbound serial interfaces connecting to an IP WAN.

For traffic coming inbound you could mark the inbound packets based on DSCP/Precedence (apply the service-policy on the lan interface in the outbound direction. Your internal LAN switches or other routers can use these marked (classified) packets for QOS in the LAN. Essentially using Outbound QOS policy maps you can achieve Outbound and Inbound QOS.

policy-map Outbound

class Voice

priority 512

class Data

bandwidth 256

int s0

service-policy output Outbound

int e0

service-policy output Inbound

policy-map Inbound

class Voice

set cos 5

class Data

set cos 3

(These cos values are set at the router and the internal equipments - Lan switches/Routers can use these marked packets for further QOS)

Hope that helps!

[chenleish]

maybe I didn't explain clearly.

em.......

let's suppose we have A user who want us to offer QOS for all his application, and b,c,d.....zzz user (thousands of them) doesn't want qos .

then A want to ftp-get from b,c,d....zzz, we can marking the packets from A base on dcsp for example.

but for packets to A, how we do? marking it on the PE which connect to b,c,d...zzz base on destination IP address?

so what if there are many qos user and nonqos user?

that will be a terrible job!

[chenleish]

no one know?