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Chapter 1 Introducing the Cisco Wide Area Application Engine
Hardware Features
1-20
Csico Wide Area Application Engine 7326 Hardware Installation Guide
OL-6831-02
Some switches support automatic medium-dependent interface crossover
(MDIX). You can configure MDIX by using the mdix auto global configuration
switch command. If your switch supports MDIX, you do not need to follow these
cabling rules because MDIX automatically adjusts transmit and receive pairs
when an incorrect cable type (crossover or straight-through) is installed on a
10/100 Fast Ethernet port. However, when you configure MDIX, you must also
configure the port to use autosense (not manual selection of speed/duplex).
Caution If you are connecting to Fast Ethernet ports on both the LAN and the WAN sides
of the WAE inline appliance, you must consider the types of devices that are being
connected, and you must use the correct cables. You must follow these cabling
instructions for the inline network adapter to work properly. (See Table 1-8. For
illustrations and examples, see the “Installation Scenarios and Cabling Examples
for Fast Ethernet Connections” section on page 1-22.)
To connect the inline network adapter using the correct cables for Fast Ethernet
connections, follow these steps:
Step 1 Determine which type of cable you would use for a direct connection between
your two end devices (without a WAE inline network appliance connected
between them) by using the following standard cabling rules:
• When you are directly connecting two network devices that are similar, such
as two switches, use a crossover cable.
• When you are directly connecting two network devices that are different, such
as a switch and router, use a straight-through cable.
Router to WAE and
WAE to Router
Crossover or Straight-through
Crossover or Straight-through
WAE to WAE Crossover or Straight-through
Table 1-7 Cable Requirements for WAE Connections Using Gigabit
Ethernet (continued)
Connection Required Cable