Specifications

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Cisco Aironet 1200 Series Access Point Installation and Configuration Guide
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Chapter 7 Configuring Radio Settings
Configuring the Ethernet Encapsulation Transformation Method
Configuring the Ethernet Encapsulation Transformation Method
When the access point receives data packets that are not 802.3 packets, the access point must format the
packets to 802.3 using an encapsulation transformation method. These are the two transformation
methods:
• 802.1H—This method provides optimum performance for Cisco Aironet wireless products. This is
the default setting.
• RFC1042—Use this setting to ensure interoperability with non-Cisco Aironet wireless equipment.
RFC1042 does not provide the interoperability advantages of 802.1H but is used by other
manufacturers of wireless equipment.
Beginning in privileged EXEC mode, follow these steps to configure the encapsulation transformation
method:
Enabling and Disabling Reliable Multicast to Workgroup
Bridges
Reliable multicast messages from the access point to workgroup bridges allow approximately 20 Cisco
Aironet Workgroup Bridges to associate to the access point. The default setting, disabled, allows more
than 20 workgroup bridges to associate to the access point.
Access points and bridges normally treat workgroup bridges not as client devices but as infrastructure
devices, like access points or bridges. Treating a workgroup bridge as an infrastructure device means that
the access point reliably delivers multicast packets, including Address Resolution Protocol (ARP)
packets, to the workgroup bridge.
The performance cost of reliable multicast delivery—duplication of each multicast packet sent to each
workgroup bridge—limits the number of infrastructure devices, including workgroup bridges, that can
associate to the access point. To increase beyond 20 the number of workgroup bridges that can associate
to the access point, the access point must reduce the delivery reliability of multicast packets to
workgroup bridges. With reduced reliability, the access point cannot confirm whether multicast packets
reach the intended workgroup bridge, so workgroup bridges at the edge of the access point's coverage
area might lose IP connectivity. When you treat workgroup bridges as client devices, you increase
performance but reduce reliability.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface dot11radio { 0 | 1 } Enter interface configuration mode for the radio interface. The
2.4-GHz radio is radio 0, and the 5-GHz radio is radio 1.
Step 3
payload-encapsulation
snap | dot1h
Set the encapsulation transformation method to RFC1042
(snap) or 802.1h (dot1h, the default setting).
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.