Event: RIPE 52, April 2006, Istanbul, Turkey
Author(s): Thomas Telkamp, Director of Network Consulting (Cariden)
For most Internet service providers, the majority of their traffic enters or leaves the network via BGP-enabled peerings or upstream providers. Not only do these links need to have enough capacity during normal operation, but they also need to provide redundant capacity during link failures. For the egress traffic this can be easily verified by simulating the rerouting under failure since the topology of the network is completely known. The return traffic, however, cannot be simulated because the behaviour of the remote network is unknown. This creates a gap in the planning process for external peering links.
This presentation offers a simple methodology for creating failover matrices that describe the traffic redistribution under peering link failure conditions. These matrices provide a useful mechanism for sharing information and improving the mutual planning process without disclosing any proprietary information.
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