Mechanisms in gathering Traffic Matrix in Service Provider networks
We are planning to gather traffic matrix in our network. Our network comprises of Cisco devices (NPE-G1, NPE-G2, GSR, CRS, 7600, ISR-G1/2). Currently there is no traffic matrix calculation per service/COS that has been done in our network for capacity planning. We would like to start an exercise of gathering traffic matrix to account for POP to POP, PE to PE traffic for better visibility into our network.
I tried doing MPLS traffic counters but that is not giving the correct value. BGP Policy Accounting is another option but I dont think it will work for MPLS VPN customers as majority of our traffic is through MPLS VPN.
Our network do not have point to point TE tunnels built between POP to POP to gather this information.
I am exploring the option of "MPLS Aware Netflow" in "P" routers to gather this information.
I would like to hear from others who have done such kind of traffic matrix in their network along with its pros and cons in the interim which would help me in effectively working out?
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