User Manual Part 2

Wi-Fi Array
Configuring the Wi-Fi Array 183
primary link. Gigabit2 is the backup link and is passive. Gigabit2
assumes the IP properties of Gigabit1. If Gigabit 1 fails the Array
automatically fails over to Gigabit2. When a failover occurs in this
mode, Gigabit2 issues gratuitous ARPs to allow it to substitute for
Gigabit1 at Layer 3 as well as Layer 2. See Figure 89 (a).
b. Aggregate Traffic from gig1 & gig2 using 802.3ad — The Array sends
network traffic across both gigabit ports to increase link speed to the
network. Both ports act as a single logical interface (trunk), using a
load balancing algorithm to balance traffic across the ports. For non-
IP traffic (such as ARP), the last byte of the destination MAC address
is used to do the calculation. If the packet is a fragment or not TCP or
UDP, the source and destination IP addresses are used to do the
calculation. If the packet is TCP or UDP over IP then the source IP
address, destination IP address, source port number and destination
port number are all used to do the calculation. The network switch
must also support 802.3ad. If a port fails, the trunk degrades
gracefully — the other port still transmits. See Figure 89 (b).
Figure 89. Port Modes (a-b)
Gig1 Gig2
Primary Link
Secondary Link :
carries all traffic
if primary fails
Switch
Gig1 Gig2
Switch
Links split traffic based on
destination address , using
802.3ad link aggregation
Destinations
(a) Active backup (b) Aggregate using 802.3ad