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Chapter 5: Configuring the Spanning Tree
146
away from their root IP subnet.
Unicast frames are not flooded. Unicast frames are only forwarded
outbound through an IP tunnel if the destination address identifies an end
device that has roamed to a remote IP subnet. End devices attach to the
root access point, which maintains entries for these devices in its
forwarding database. The database entries indicate the correct subnet for
outbound forwarding.
For TCP/IP applications, IP and ARP frames must be forwarded through
IP tunnels. An IP or ARP frame is only forwarded outbound if the
destination address identifies an end device on the root IP subnet.
Usually, ARP requests (which are multicast frames) that originate on the
root IP subnet are forwarded outbound to all devices on the network,
including through IP tunnels to remote IP subnets. However, if you enable
ARP flooding, ARP frames are only sent through the IP tunnel to the
destination end device.
MAC frames that are forwarded outbound are encapsulated in the root
access point, forwarded through the network, unencapsulated by the
access point at the remote end of the IP tunnel, and forwarded to the
appropriate access point (if necessary) for delivery to the destination end
device.
Inbound Frames
Frames are forwarded inbound (to the primary LAN) through an IP tunnel
if:
an end device is known to be attached to an access point on a remote
IP subnet.
the frame type is configured to pass.
IP and ARP frames are only forwarded inbound through the IP tunnel if the
source IP address belongs to the root IP subnet. Usually, these frames
originate from wireless end devices that have roamed away from their root
IP subnet. Frames transmitted by servers or wired devices that are
connected to a remote IP subnet are not forwarded inbound through IP
tunnels if the IP address does not belong to the root IP subnet.
MAC frames that are forwarded inbound are encapsulated by the access
point at the remote end of the IP tunnel, forwarded through the IP tunnel to
the root access point, unencapsulated, and placed on the network.