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Cisco Wide Area Virtualization Engine 594 and 694 Hardware Installation Guide
OL-24619-02
Chapter 5 WAVE Interface Modules
Network Adapter Cabling Requirements
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 WAVE 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 5-6. For illustrations and examples, see the “Installation Scenarios and Cabling Examples for Fast
Ethernet Connections” section on page 5-10.)
To connect the inline network adapter using the correct cables for Fast Ethernet connections, follow
these steps:
Step 1 Determine the type of cable that you would use for a direct connection between your two end devices
(without a WAVE 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.
Note Because the inline network adapter has an internal crossover connection that becomes active
when the InlineGroup interface is placed in mechanical bypass mode, you must decide which
cable you would use to connect the two network devices directly, and then you must install the
other cable type (on one side, usually the WAN side of the inline appliance) instead.
Table 5-6 shows the cable requirements for WAVE and non-WAVE connections when you are using Fast
Ethernet end to end.
Table 5-6 Cable Requirements for WAVE Connections Using Fast Ethernet
Connection Required Cable
Switch to switch (no WAVE) Crossover
Switch to router (no WAVE) Straight-through
Router to router (no WAVE) Crossover
Switch to WAVE and
WAVE to Router
Straight-through
Crossover
Switch to WAVE and
WAVE to Switch
Straight-through
Straight-through
Router to WAVE and
WAVE to Router
Straight-through
Straight-through
WAVE to WAVE Crossover