Users Guide

778 VLANs
forward received traffic to the promiscuous ports and other community ports
using the same secondary VLAN. Isolated ports transmit received traffic to
the promiscuous ports only.
The ports to which the broadcast traffic is forwarded depend on the type of
port on which the traffic was received. If the received port is a host port,
traffic is broadcast to all promiscuous and trunk ports. If the received port is a
community port, the broadcast traffic is forwarded to all promiscuous, trunk,
and community ports in the same secondary VLAN. A promiscuous port
broadcasts traffic to other promiscuous ports, isolated ports, and community
ports.
Table 21-2. Forwarding Rules for Traffic in Primary VLAN
Table 21-3. Forwarding Rules for Traffic in Community 1 VLAN
To
From promiscuous community 1 community 2 isolated stack (trunk)
promiscuous allow allow allow allow allow
community 1 N/A N/A N/A N/A N/A
community 2 N/A N/A N/A N/A N/A
isolated N/A N/A N/A N/A N/A
stack (trunk) allow allow allow allow allow
To
From promiscuous community 1 community 2 isolated stack (trunk)
promiscuous N/A N/A N/A N/A N/A
community 1 allow allow deny deny allow
community 2 N/A N/A N/A N/A N/A
isolated N/A N/A N/A N/A N/A
stack (trunk) allow allow deny deny allow