Technical data

Dual-Ethernet Operation

Configuring a Redundant Interface

See the chapter Implementing Redundancy.

Configuring an Active Interface

The following commands configure Ethernet port 2 as an active interface that can be

used to support a VLAN or GRE (Generic Routing Encapsulation) tunneling. The ip

address specifies the IP address of the VLAN or GRE local endpoint followed by the

associated netmask. The gw command specifies the gateway address, and is a manda-

tory field.

default# configure terminal

default(config)# interface FastEthernet 2

default(config-if-FastEth)# ip address 172.26.16.200 255.0.0.0

default(config-if-FastEth)# gw 172.26.16.1

default(config-if-FastEth)# type active

default(config-if-FastEth)# exit

default(config)# exit

Note that when changing from redundant to dual active operation, a controller

reboot is required.

After completing the interface configuration above, to configure a GRE tunnel, see

Configure GRE Tunnels in the Security chapter.

Viewing FastEthernet Interface Information

To view the FastEthernet interface 1 configuration, use the show interfaces FastEth-

ernet controller or show interfaces FastEthernet ap commands to display informa-

tion relating to each type of interface.

To view the FastEthernet interface 2 redundant configuration, use the command

show second_interface_status.

Note:

Do not insert an Ethernet cable into the second Ethernet port until it has been

configured as active or redundant.

Note:

In the active configuration, the second Ethernet interface must be configured

with a static IP address (not DHCP) to a different L2 domain than the primary

interface.