3com WX1200 Note De Mise

W

IRELESS

 LAN S

WITCH

 

AND

 C

ONTROLLER

 MSS V

ERSION

 3.0 R

ELEASE

 N

OTES

If the Mobility Domain contains intermediary switches 
or routers that use a router redundancy protocol, WX 
switches that communicate through those intermedi-
ary devices might lose communication with one other 
due to the way some router redundancy protocols 
handle MAC addresses. If this issue occurs, log mes-
sages appear periodically on the seed WX switch indi-
cating that member WX switches are entering or 
leaving the Mobility Domain.

Set the FDB timer (default 300 seconds) and the ARP 
timer (default 1200 seconds) to the same values on 
the WX switches. 3Com recommends using 300 sec-
onds as the value for both timers. To set the FDB 
timer, use the set fdb agingtime command. To set 
the ARP timer, use the set arp agingtime command.

If you configure a port group containing ports that 
are already in a VLAN that is running STP, and you 
then add the port group to the VLAN, a Layer 2 loop 
can occur in the VLAN. This can occur when the WX 
switch is not the root bridge.

Instead of adding the port group’s ports to the VLAN 
individually, configure the port group before you add 
the groups ports to the VLAN, then add the port 
group to the VLAN.

Ports 7 and 8 on the WX1200 are uplink ports and do 
not support PoE. However, the CLI allows you to con-
figure these ports as MAP access ports, for directly 
connected MAPs, with an external PoE source to 
power the MAPs. Even though the MAPs boot, clients 
associated with the MAPs might not receive network 
access. This issue does not occur if the MAPs con-
nected to ports 7 and 8 are configured as Distributed 
MAPs.

To use a MAP that is directly connected to port 7 or 8 
on a WX1200, configure the MAP as a Distributed 
MAP (set dap command), not as a directly connected 
MAP (set port type ap command).

To become fully active, a Distributed MAP does a full 
restart after downloading its software image. The first 
time the MAP is powered up, it sends a DHCP dis-
cover for an IP address, uses DNS to find its config-
ured WX switch, then downloads its software image 
from that WX. After downloading the image, the 
MAP restarts itself with the downloaded image and 
sends a second DHCP discover to again obtain its IP 
address. In a network containing more than one 
DHCP server, it is possible for the MAP to use one IP 
address when downloading the image, but end up 
with a second IP address after rebooting the second