Broadcast leaks, Figure 7, Static ports – Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) User Manual
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Brocade Virtual ADX Switch and Router Guide
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Overview
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FIGURE 7
VLAN with dynamic ports—candidate ports become active again if they receive protocol traffic
Static ports
Static ports are permanent members of the IP subnet VLAN. The ports remain active members of
the VLAN regardless of whether the ports receive traffic for the VLAN’s 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 an IP subnet
VLAN configured in the port-based VLAN, you can explicitly exclude the port. You exclude the port
when you configure the IP subnet VLAN.
Excluded ports do not leak broadcast packets. Refer to
Broadcast leaks
A dynamic port becomes a member of a Layer 3 protocol VLAN when traffic from the VLAN's
protocol is received on the port. After this point, the port remains an active member of the protocol
VLAN, unless the port does not receive traffic from the VLAN's protocol for 20 minutes. If the port
does not receive traffic for the VLAN's protocol for 20 minutes, the port ages out and is no longer
an active member of the VLAN.
To enable a host that has been silent for awhile to send and receive packets, the dynamic ports
that are currently members of the Layer 3 protocol VLAN "leak" Layer 3 broadcast packets to the
ports that have aged out. When a host connected to one of the aged out ports responds to a leaked
broadcast, the port is added to the protocol VLAN again.