Long-Distance, High-Bandwidth Transport Configuration - Cisco Catalyst 2975 Software Configuration Manual

Network Configuration Examples
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 destination VLAN. In this network, the routers are providing
inter-VLAN routing. VLAN access control lists (VLAN maps) on the switch provide intra-VLAN
security and prevent unauthorized users from accessing critical areas of the network.
In addition to inter-VLAN routing, the routers provide QoS mechanisms such as DSCP priorities to
prioritize the different types of network traffic and to deliver high-priority traffic. If congestion occurs,
QoS drops low-priority traffic to allow delivery of high-priority traffic.
Cisco CallManager controls call processing, routing, and Cisco IP Phone features and configuration.
Users with workstations running Cisco SoftPhone software can place, receive, and control calls from
their PCs. Using Cisco IP Phones, Cisco CallManager software, and Cisco SoftPhone software integrates
telephony and IP networks, and the IP network supports both voice and data.
The routers also provide firewall services, Network Address Translation (NAT) services, voice-over-IP
(VoIP) gateway services, and WAN and Internet access.
Figure 1-4
Catalyst 2975
switch stack

Long-Distance, High-Bandwidth Transport Configuration

Figure 1-5
Catalyst 2975 switches have coarse wavelength-division multiplexing (CWDM) fiber-optic SFP
modules installed. Depending on the CWDM SFP module, data is sent at wavelengths from 1470 to
1610 nm. The higher the wavelength, the farther the transmission can travel. A common wavelength used
for long-distance transmissions is 1550 nm.
Catalyst 2975 Switch Software Configuration Guide
1-20
Collapsed Backbone Configuration
Cisco 2600 or
3700 routers
IP IP
Cisco IP
Workstations
phones
Cisco SoftPhone
shows a configuration for sending 8 Gigabits of data over a single fiber-optic cable. The
Internet
Aironet wireless
access points
running
software
Chapter 1 Overview
Gigabit
servers
OL-19720-02