Intermec 6710 - Manual (Page 231)

APPENDIX E
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OWL/IP
6710 Access Point User’s Guide E-9
Following are three primary differences between secondary
LANs separated by wireless links and secondary LANs
separated by OWL/IP tunnels:
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Any access point on the distribution LAN can provide
wireless connectivity for a designated bridge on a
secondary Ethernet LAN. Only the super root can
originate OWL/IP connections to designated bridges
on remote subnets.
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Flooding parameters for designated bridges on
secondary Ethernet LANs can be adjusted through the
global settings in the super root, or through local
configuration in the designated bridge. Flooding
parameters for OWL/IP tunnels are not adjustable.
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The super root and designated bridges for OWL/IP
tunnels include additional configurable output
(transmit) filters, allowing frame types forwarded
through tunnels to be tightly controlled. These filters
are provided in addition to the standard Ethernet
input filters available in all access points.
Tunnel Origination
Building the Spanning Tree
The open wireless LAN spanning tree is established and
maintained by short hello messages originating at the super
root. “Hellos” are broadcast periodically at intervals of a
few seconds. These frames contain network coordination
information, including root priority.
At power up, all super root candidates listen for hello
messages. If they do not detect hellos, or detect hellos from
a lower priority root candidate, they begin to send hello
messages.