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1-10 Cisco BPX 8600 Series Reference
BPX Switch Operation
Routing Hubs and Interface Shelves
In a tiered network, interface shelves at the access layer (edge) of the network are connected to
routing nodes via feeder trunks (Figure 1-4). Those routing nodes with attached interface shelves are
referred to as routing hubs. The interface shelves, sometimes referred to as feeders, are non-routing
nodes. The routing hubs route the interface shelf connections across the core layer of the network.
The interface shelves do not need to maintain network topology nor connection routing information.
This task is left to their routing hubs. This architecture provides an expanded network consisting of
a number of non-routing nodes (interface shelves) at the edge of the network that are connected to
the network by their routing hubs.
For detailed information about tiered networks, refer to Chapter 13, “Tiered Networks”.