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DTUS065 rev A.7 – June 27, 2014
Root mode:
This indicates whether this station is a root node, and how it advertises this
fact to other stations. A root node sends periodical broadcasts to inform all
the other nodes of its existence. This can speed up routing decisions in some
cases. Several stations can be set in root mode in the same mesh, but the
broadcast messages overhead reduces useable bandwidth.
Three root modes are available. For details on how they work, see the IEEE
802.11-2012 standard, chapter 13.
Proactive PREQ: the root station periodically sends out a broadcast
HWMP PREQ frame that establishes a data path from any node to
the root.
Proactive PREQ with PREP: the root station periodically sends out a
broadcast HWMP PREQ frame that establishes a data path from any
node to the root, and requires the nodes to answer back with a
HWMP PREP frame that establishes the reverse data path from the
root to any node.
Proactive RANN: the root station periodically sends out a broadcast
HWMP RANN frame advertising its address (receiving stations then
request a path to the root with a unicast PREQ).
The next parameters vary depending on the exact root mode.
Enable gate announcements (root mode only):
This flag should be set if this product has access to a network outside the
mesh, which holds always true since bridging networks is the purpose of
these products. The flag is sent to all other nodes to advertise the fact that
MAC addresses outside the mesh might be reached through this root node.
Active path to root timeout (root mode only):
This is the same as “Active path timeout” but is used only in proactive
PREQ sent by this root node.
PREQ root interval (PREQ root modes only):
This value represents the time between proactive PREQ broadcasts.
RANN root interval (RANN root mode only):
This value represents the time between proactive RANN broadcasts.