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Extra resources for Building Scalable Cisco Internetworks BSCI Student Guide v2.1
2004 Cisco Systems, Inc. All rights reserved. 1 1-13 Corporate reorganizations have little impact on the rest of the network when implemented in a scalable network. For example, assume an example network that uses Frame Relay at the remote sites. The network administrator in the example network would accommodate a corporate reorganization with the following process: Install two additional virtual circuits from router H to routers B and E. Following a successful installation, remove the virtual circuits to routers M and L.
How much bandwidth do you need, and where do you place it to support this network? If router D fails, which pathways handle the new load? © 2004 Cisco Systems, Inc. All rights reserved. 1 1-12 The behavior of a scalable network is predictable. To gain predictability, bandwidth in a scalable network is equal to the higher-level site at each layer. For example, router C in the figure has the same bandwidth as routers B and E, so that router C fulfills load balancing. This load balancing allows access to networks behind routers B and E.
Efficient use of IP addresses: Hierarchical addressing provides the advantage of using all possible addresses because the addresses are grouped contiguously. 1 Copyright © 2004, Cisco Systems, Inc. assignment, addressing conflicts can waste groups of addresses. For example, recall that classful routing protocols automatically create summary routes at a network boundary. These protocols do not support discontiguous addressing, so some addresses are unusable if you do not assign then contiguously.