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Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
OL-12189-01
Chapter 1 Overview
Network Configuration Examples
QoS and policing on the switches provide preferential treatment for certain data streams. They
segment traffic streams into different paths for processing. Security features on the switch ensure
rapid handling of packets.
Fault tolerance from the server racks to the core is achieved through dual homing of servers
connected to dual switch stacks or the switches, which have redundant Gigabit EtherChannels and
cross-stack EtherChannels.
Using 10-Gigabit Ethernet uplinks from the switches provides redundant uplinks to the network
core.
The various lengths of stack cable available, ranging from 0.5 meter to 3 meters, provide extended
connections to the switch stacks across multiple server racks, for multiple stack aggregation.
Figure 1-2 Expanded Data Center
Small to Medium-Sized Network
Figure 1-3 shows a configuration for a network of up to 500 employees. This network uses a Layer 3
switch stack with high-speed connections to two routers. For network reliability and load-balancing, this
network has HSRP enabled on the routers and on the switches. This ensures connectivity to the Internet,
WAN, and mission-critical network resources in case one of the routers or switches fails. The switches
are using routed uplinks for faster failover. They are also configured with equal-cost routing for load
sharing and redundancy. A Layer 2 switch stack can use cross-stack EtherChannel for load sharing.
The switches are connected to local servers. The server farm includes a call-processing server running
Cisco CallManager software. Cisco CallManager controls call processing and routing. The switches are
interconnected through Gigabit interfaces.
This network uses VLANs to logically segment the network into well-defined broadcast groups and for
security management. Data and multimedia traffic are configured on the same VLAN. Voice traffic is
configured on separate VVIDs. If data, multimedia, and voice traffic are assigned to the same VLAN,
only one VLAN can be configured per wiring closet.
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Campus
core
Catalyst
6500 switches
Catalyst 6500
multilayer switches
Blade switch
StackWise
switch stacks
Blade server
enclosures