QOS Implementation

[m.dridi89]

Hello,

Recently ,I've been studying about qos  for a project our client  have multiple ISP connection  in my case :

LAN--------ROUTER1-------400M----------------------WAN--------------100M--------------ROUTER2-----------LAN

AS you can see  we have 400M in one side and 100M in the other 

My initial configuration is 

policy-map  parent

class class-default 

service-policy child

shape average  ----------> here come the issue  should i write it 400000k  and then i can experience a congestion in router 2 or 100000k and then the client will loss 300M ????

is there a solution to overcome this issue??

[Philip D'Ath]

The parent policy on each router should match the actual circuit size.  So 400M on router 1, and 100M on router 2.

Then you create a child policy on each router guaranteeing how much bandwidth to use for the VPN.  So if you wanted to guarantee 80% for the VPN, you would make the child policy 80Mb/s on both ends.

[Joseph W. Doherty]

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Posting

You would shape router1 to 100 Mbps, for traffic going to router2.  (Actually, I recommend you shape about 15% slower, to allow for L2 overhead.)

This allows you to use your 300 Mbps for other things, but not for traffic to router2, which the other 300 Mbps doesn't exist any way.

BTW, the advantage of shaping, is it allows you to manage congestion, that would otherwise not be managed by you.  If you have no interest in managing your congestion, there's no real reason to shape.