Small To Medium-Sized Network Using Catalyst 3750 Switches - Cisco WS-C3750-48PS-S Software Configuration Manual

Chapter 1 Overview
Figure 1-5 Linux Server Cluster
Etherchannel
Campus
across uplinks
core

Small to Medium-Sized Network Using Catalyst 3750 Switches

Figure 1-6
Catalyst 3750 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 workstations, local servers, and IEEE 802.3af compliant and
noncompliant powered devices (such as Cisco IP Phones). The server farm includes a call-processing
server running Cisco CallManager software. Cisco CallManager controls call processing, routing, and
IP phone features and configuration. 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 from
the Cisco IP Phones are 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.
When an end station in one VLAN needs to communicate with an end station in another VLAN, a router
or Layer 3 switch routes the traffic to the appropriate destination VLAN. In this network, the switch
stack is providing inter-VLAN routing. VLAN access control lists (VLAN maps) on the switch stack
provide intra-VLAN security and prevent unauthorized users from accessing critical pieces of the
network.
78-16180-02
Catalyst 3750
Redundant
StackWise switch stack
SFP uplinks
Linux cluster
parallel-
processing
server farm
32-Gbps ring
Catalyst 3750
StackWise switch stack
shows a configuration for a network of up to 500 employees. This network uses a
Network Configuration Examples
Catalyst 3750 Switch Software Configuration Guide
1-17