Brocade TurboIron 24X Series Configuration Guide - Manual (Page 407)

Brocade TurboIron 24X Series Configuration Guide 373
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VLAN overview
SUBNET Ports in a new protocol VLAN that do not receive traffic for the VLAN protocol age out after
10 minutes and become candidate ports.
Figure 42 shows what happens if a candidate port
receives traffic for the VLAN protocol.
FIGURE 42 VLAN with dynamic ports—candidate ports become active again if they receive
protocol traffic
Static ports
Static ports are permanent members of the protocol VLAN. The ports remain active members of
the VLAN regardless of whether the ports receive traffic for the VLAN protocol. You must explicitly
identify the port as a static port when you add it to the VLAN. Otherwise, the port is dynamic and is
subject to aging out.
Excluded ports
If you want to prevent a port in a port-based VLAN from ever becoming a member of a protocol, IP
subnet, IPX network, or AppleTalk cable VLAN configured in the port-based VLAN, you can explicitly
exclude the port. You exclude the port when you configure the protocol, IP subnet, IPX network, or
AppleTalk cable VLAN.
Excluded ports do not leak broadcast packets. Refer to “Broadcast leaks” on page 374.
Ports that time out remain candidates
for membership in the VLAN and become active
again if they receive traffic for the VLAN’s
protocol, IP sub-net, IPX network, or
AppleTalk cable range.
When a candidate port rejoins a VLAN,
the timeout for that port becomes 20 minutes.
Thus, the port remains an active member of
the VLAN even if it does not receive traffic
for 20 minutes. After that, the port becomes
a candidate port again.
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