Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 44)

30 Brocade Virtual ADX Switch and Router Guide
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Overview
3
• Static ports
You also can explicitly exclude ports.
Dynamic ports
Dynamic ports are added to a VLAN when you create the VLAN. However, if a dynamically added
port does not receive any traffic for the VLAN’s IP subnet within ten minutes, the port is removed
from the VLAN. However, the port remains a candidate for port membership. Thus, if the port
receives traffic for the VLAN’s IP subnet, the Virtual ADX adds the port back to the VLAN.
After the port is added back to the VLAN, the port can remain an active member of the VLAN up to
20 minutes without receiving traffic for the VLAN’s protocol. If the port ages out, it remains a
candidate for VLAN membership and is added back to the VLAN when the VLAN receives protocol
traffic. At this point, the port can remain in the VLAN up to 20 minutes without receiving traffic for
the VLAN’s IP subnet, and so on.
Unless you explicitly add a port statically or exclude a port, the port is a dynamic port and thus can
be an active member of the VLAN, depending on the traffic it receives.
Figure 6 shows an example of a VLAN with dynamic ports. Dynamic ports not only join and leave
the VLAN according to traffic, but also allow some broadcast packets of the specific protocol to
“leak” through the VLAN. Refer to
“Broadcast leaks” on page 31.
FIGURE 6 VLAN with dynamic ports—all ports are active when you create the VLAN
Ports in a new IP subnet VLAN that do not receive traffic for the VLAN’s protocol age out after 20
minutes and become candidate ports.
Figure 7 shows what happens if a candidate port receives
traffic for the VLAN’s protocol.