Intermec 6710 - Manual (Page 232)

APPENDIX E
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OWL/IP
E-10 6710 Access Point User’s Guide
If a super root candidate receives a hello from an access
point with a higher root priority (or equal root priority from
a higher MAC address), it stops sending hellos. This root
election protocol continues until only one super root access
point sends hellos. After the super root is established, other
access points attach to the super root forming the spanning
tree.
Establishing and Maintaining Tunnels
Once a super root is elected, it begins to forward hello
messages to IP addresses configured in the OWL/IP menu.
Designated bridge candidates on a remote subnet use
bridge priority in a similar election procedure to determine
which access point serves as designated bridge for that
subnet.
Once a designated bridge is elected, it attaches to the super
root, indicating that it is the designated bridge for the
subnet. Designated bridges are responsible for forwarding
hellos to other access points on the local subnets. These
hellos indicate to other access points that they are the
designated bridge for that subnet.
Redundancy
The super root and designated bridge election procedure are
repeated if the current super root or designated bridge stops
sending hellos. This provides redundancy in the event of an
isolated access point, router, power, or cabling failure.
Normally, one primary and one or two fallback super root
candidates are sufficient for super root redundancy. One
primary designated bridge and one fallback are recommend
for most remote subnet installations. The number of
remote subnets and redundancy needs on each subnet
influences the selection of address types in the [IP
Addresses] menu. See the configuration examples on page
E-13.