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Multi-tenanted vRF based WAN router and Security

Hi Guys,              

Looking for some ideas/suggestions around multi-tenanted vRF based WAN router security. So lets say you have MPLS edge that terminates on a high end router and is vRF based to segregate each customer into virtual routing tables. What security elements would you enable to prevent user X within vRF RED from attacking the shared router and performing a denial of service attack? The end goal is to protect the router with it being multi-tenanted. Some would say stick a pair of Cisco ASA5550’s behind the router(s) and present a context per customer per vRF. We've been looking at tcp-intercept, disabling all local service, locking down ssh etc.. Any ideas?

Cheers

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