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Motorola 2.1 ユーザーズマニュアル

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Chapter 2: Network Setup  
3.  The DHCP server observes that the request originates from the 10.24.0.0/16 network.  It answers 
this request with a 10.24.X.X/16 IP address.  Please recall that this DHCP pool has been 
configured on the DHCP server running on the One Point Wireless Manager
™
 server. 
4.  The 3750 switch receives this reply and forwards it out back on VLAN 24 to the IAP. 
 
Figure 2-5 
VLAN Example 1 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In our next example 
 
 
IAP
Layer 3 Switch
VLAN 24 10.24.0.1
IP helper address 172.31.0.20
Wireless Manager
172.31.0.20
MODE
STACK
SPEED
DUPLX
STAT
MASTR
RPS
SYST
1
2
3
4
5
6
7
8
9 10
11 12
1X
2X
11X
12X
13 14
15 16
17 18
19 20
21 22
23 24
13X
14X
23X
24X
Catalyst 3750
SERIES
1
2
Management 
VLAN 24
1
2
3
4
IAP
Layer 3 Switch
VLAN 24 10.24.0.1
IP helper address 172.31.0.20
Wireless Manager
172.31.0.20
MODE
STACK
SPEED
DUPLX
STAT
MASTR
RPS
SYST
1
2
3
4
5
6
7
8
9 10
11 12
1X
2X
11X
12X
13 14
15 16
17 18
19 20
21 22
23 24
13X
14X
23X
24X
Catalyst 3750
SERIES
1
2
Management 
VLAN 24
1
2
3
4
 
In the next example an 802.11 client has associated to a virtual access point on our IAP.  The DHCP 
exchange is as follows: 
 
1.  The client sends a DHCP request.   
2.  The IAP tags this request with VLAN 49 and forwards it to the 3750 switch. 
3.  The 3750 switch receives the DHCP request on Port 18 which is also configured to accept 
packets on VLAN 49.  VLAN 49 is configured on the 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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