Aerohive Networks AP121 Hardware Reference Manual page 69

Chapter 7 The AP340 Platform
Switch(config)#interface fastEthernet 0/1
Switch(config-if)#switchport mode access
Switch(config-if)#channel-group 1 mode on
Switch(config-if)#spanning-tree portfast
Switch(config-if)#exit
Switch(config)#int fastEthernet 0/2
Switch(config-if)#switchport mode access
Switch(config-if)#channel-group 1 mode on
Switch(config-if)#spanning-tree portfast
Switch(config-if)#exit
Switch(config)#exit
Switch#wr mem
Finally, you must cable the Cisco switch and the AP together: Cisco 0/1 to AP eth0, and Cisco 0/2 to AP eth1.
Redundant Interface
If a single Ethernet link provides sufficient bandwidth and speed, such as a 1000 Mbps link, but you want to
ensure link redundancy, you can connect the two Ethernet ports to the same switch—or to two different
switches—and configure them to act as a redundant interface called "red0". In this mode, only one Ethernet
interface is actively forwarding traffic at any one time. If eth0 is active and eth1 is passive and eth0 loses its
connection, the AP switches over to eth1. To configure a redundant interface, enter the following
commands:
interface eth0 bind red0 primary
interface eth1 bind red0
The interface that you specify as primary is the one that the AP uses when both interfaces have network
connectivity. Because the AP uses eth0 as the primary interface by default, it is unnecessary to specify
"primary" in the first command above. However, it is included to make the role of eth0 as the primary
interface obvious.
No extra configuration is necessary on the connecting switch or switches to support a redundant
interface.
Interface Selection for the Default Route
In cases where there are multiple active interfaces in backhaul mode, the AP uses the following logic to
choose which interface to use in its default route:
• If there is an Ethernet interface and a wireless interface in backhaul mode, the AP uses the Ethernet
interface in its default route.
• If there are multiple Ethernet interfaces in backhaul mode, the AP chooses which one to use in its default
route in the following order:
• It uses red0 or agg0 if either has at least one member interface bound to it and its link state is UP.
• It uses ETH0 if neither red0 nor agg0 has any member interfaces and the link state for ETH0 is UP.
• It uses ETH1 if neither red0 nor agg0 has any member interfaces, the link state for ETH0 is DOWN, and
the link state for ETH1 is UP.
68 Aerohive