Core IP Routing and Switching Technology - Cvt-dallas.org

Next Generation Backbone
Network Issues - 3
• VPN requires cost/performance tradeoff knobs
(gold, silver, bronze)
– Approaches
– Supply an entire λ (very expensive)
– Electrical multiplexing (expensive, inflexible)
– Packet multiplexing (efficient, flexible, but large
management effort)
– Use packet QoS markers for drop probability,
packet rate-limiting to assure service
– Mark at the edge, tunnel through the core
– Tandem switching architectures scale better
for large networks than a flat core
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