infrastructure for peak performance?
the network traffic is contained on the LAN. Performance problems at WeServeData quite
likely started when new and existing user applications started moving to centralized
sources of data storage and retrieval. No longer an 80/20 model, the traffic pattern has
moved toward what is now referred to as the 20/80 model. In the 20/80 model, the new
application requirements are considered because only 20% of the traffic is assumed to be
local to the workgroup LAN, and 80% of the traffic is assumed to be leaving. The
recommended design assumed the 20/80 model.
traffic model. The two components of multilayer switching on the Catalyst 5000 family
are the RSM and the NetFlow feature card. The RSM is a Cisco IOS-based multiprotocol
router on a card. Keep in mind that no performance penalty is associated with Layer 3
switching versus Layer 2 switching with the NetFlow feature card. The distribution layer
consists of the Catalyst 5000 family of multilayer switches. The multilayer design takes
advantage of the Layer 2 switching performance and features of the Catalyst family
switches in the access layer and backbone and uses multilayer switching in the
distribution layer. The multilayer model keeps the existing logical network design and
addressing as in the traditional hub and router model. Access-layer subnets terminate at
the distribution layer. From the other side, backbone subnets also terminate at the
distribution layer. The distribution layer forms a broadcast boundary so that broadcasts
won't be passed from area to area.
every part within a layer performs the same logical function. One key advantage of
modular design is that different technologies can be deployed with no impact on the
model's logical structure. For example, Fast Ethernet can be substituted for ATM LANE.