Chapter 2: Network Setup
Figure 2-4 L3 Switch for MOTOMESH Duo 2.1 - VLAN View
MODE
STACK
SPEED
DUPLX
STAT
MASTR
RPS
SYST
12345678910 1112
1X
2X
11X
12X
1314 15 16 17 18 19 20 21 22 23 24
13X
14X
23X
24X
Catalyst 3750
SERIES
1 2

VLAN Examples
In order to better understand how VLANs are used in our small system reference design let’s examine
how traffic traverses these VLANs. In the example below the One Point Wireless Manager™ server is
connected to port 1 and our IAP is connected to port 18. Management VLAN 24 has been configured on
our IAP as well as DHCP. When the IAP is powered on it obtains an IP address in the follow steps:
1. The IAP requests an IP address via DHCP. This request is sent over VLAN 24.
2. The 3750 switch receives the DHCP request on Port 18 which is configured to accept packets on
VLAN 24. VLAN 24 is configured on the L3 switch to forward DHCP requests to the One Point
Wireless Manager™ server via the configured IP helper address 172.31.0.20. Since the One
Point Wireless Manager server™ is connected to port 1, and ports 1-4 are a part of untagged
VLAN 31, the tag is removed and the DHCP request is forwarded out port 1 to the One Point
Wireless Manager™ server.
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