Information Technology Reference
In-Depth Information
Ta b l e 5 -1 2
Supported Features and Specifications for Cisco APs
Feature
AP
1130
AP 1140
AP
3500i
AP1240
AP1250
AP 1260
AP
3500e
Antennas
Internal
Internal
Internal
External
External
External
External
WiFi
standards
a/b/g
a/b/g/n
a/b/g/n
a/b/g
a/b/g/n
a/b/g/n
a/b/g/n
DRAM
32 MB
128 MB
128 MB
32 MB
64 MB
128 MB
128 MB
Flash
16 MB
32 MB
32 MB
16 MB
32 MB
32 MB
32 MB
Branch Design Considerations
For branch net works, you need to consider the number and placement of APs, which de-
pends on the location and expected number of wireless clients at the branch office. It may
not be cost-justifiable to place a WLC at each branch office of an enterprise. One require-
ment is that the round-trip time (RTT) between the AP and the WLC should not exceed
300 ms. For centralized controllers, it is recommended that you use REAP or Hybrid
REAP (H-REAP).
Local MAC
CAPWAP supports local media access control (local MAC), which can be used in branch
deployments. Unlike with split-MAC, the AP provides MAC management support for as-
sociation requests and actions. Local MAC terminates client traffic at the wired port of
the AP versus at the WLC. This allows direct local access to branch resources without re-
quiring the data to travel to the WLC at the main office. Local MAC also allows the wire-
less client to function even if a WAN link failure occurs.
REAP
REAP is designed to support remote offices by extending LWAPP control timers. With
REAP control, traffic is still encapsulated over a LWAPP tunnel and is sent to the WLC.
Management control and RF management are done over the WAN. Client data is locally
bridged. With REAP, local clients still have local connectivity if the WAN fails.
WLCs support the same number of REAP devices as APs. REAP devices support only
Layer 2 security policies, do not support Network Address Translation (NAT), and require
a routable IP address.
Hybrid REAP
H-REAP is an enhancement to REAP that provides additional capabilities such as NAT,
more security options, and the ability to control up to three APs remotely. It is the pre-
fer red s olut ion for remote or s mall office APs to connec t to the w irele s s cont roller s over
the WAN.
