182
C
HAPTER
10: C
ONFIGURING
MAP A
CCESS
P
OINTS
Distributed MAPs and DHCP Option 43
The option 43 field in a DHCP Offer message can provide a simple and
effective way for MAPs to find WX switches across an intermediate Layer
3 network, and is especially useful in networks that are geographically
distributed or have a flat domain name space. You can use the DHCP
option 43 field to provide a list of WX IP addresses, without the need to
configure DNS servers.
To use DHCP option 43, configure the option to contain a
comma-separated list of WX IP addresses or fully qualified hostnames
(host name and domain name; for example,
host.domain.com
), in the
following format:
ip:
ip-addr1
,
ip-addr2
,...
or
host
:
hostname1
,
hostname2
,...
You can use an IP address list or a hostname list, but not both. If the list
contains both types of values, the MAP does not attempt to use the list.
The
ip
and
host
keywords can be in lowercase, uppercase (
IP
or
HOST
),
or mixed case (example:
Ip
,
Host
, and so on.) You can use spaces after
the colon or commas, but spaces are not supported within IP addresses or
hostnames. Leading zeroes are supported in IP addresses. For example,
100.130.001.1 is valid.
Valid characters in hostnames are uppercase and lowercase letters,
numbers, periods (
.
), and hyphens (
-
). Other characters are not
supported.
If you use the
host
option, you must configure the network’s DNS server
with address records that map the hostnames in the list to the WX IP
addresses.
After receiving a DHCP Offer containing a valid string for option 43, a
Distributed MAP sends a unicast Find WX message to each WX switch in
the list. See “How a Distributed MAP Contacts a WX Switch
(DHCP-Obtained Address)” on page 190 for a description of this process.
No configuration is required on the WX.
Summary of Contents for 3CRWX120695A
Page 138: ...138 CHAPTER 6 CONFIGURING AND MANAGING IP INTERFACES AND SERVICES ...
Page 272: ...272 CHAPTER 11 CONFIGURING RF LOAD BALANCING FOR MAPS ...
Page 310: ...310 CHAPTER 13 CONFIGURING USER ENCRYPTION ...
Page 322: ...322 CHAPTER 14 CONFIGURING RF AUTO TUNING ...
Page 350: ...350 CHAPTER 16 CONFIGURING QUALITY OF SERVICE ...
Page 368: ...368 CHAPTER 17 CONFIGURING AND MANAGING SPANNING TREE PROTOCOL ...
Page 412: ...412 CHAPTER 19 CONFIGURING AND MANAGING SECURITY ACLS ...
Page 518: ...518 CHAPTER 21 CONFIGURING AAA FOR NETWORK USERS ...
Page 530: ...530 CHAPTER 22 CONFIGURING COMMUNICATION WITH RADIUS ...
Page 542: ...542 CHAPTER 23 MANAGING 802 1X ON THE WX SWITCH ...
Page 598: ...598 CHAPTER 26 ROGUE DETECTION AND COUNTERMEASURES ...
Page 706: ...706 GLOSSARY ...