Event: RIPE 52, April 2006, Istanbul, Turkey
Author(s): Thomas Telkamp, Cariden
For most Internet Service Providers the majority of their traffic enters or leaves the network via BGP enabled peerings or upstream provider(s).
Not only do these links need to have enough capacity during normal operation, they also need to provide redundant capacity during link failures. For the egress traffic (service provider to remote peer) this can be easily verified by simulating the rerouting under failure, as the topology of the network is completely known. The return traffic (remote peer to service provider) however can not be simulated, as the behaviour of the remote network is not known. This creates a gap in the planning process for external peering links.
We present a simple methodology for creating ‘Failover Matrices’ that describe the traffic redistribution under peering link failure conditions. The matrices provide a useful mechanism for sharing information and improving the mutual planning process without disclosing any proprietary information. We will describe the principles behind the process as well as walk through a real scenario.
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