HP Switch 6208M-SX Manual de usuario descargar pdf (Pagina 602)

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Configuring VLANs

16 - 9

Dynamic, Static, and Excluded Port Membership

When you add ports to a protocol VLAN, IP sub-net VLAN, IPX network VLAN, or AppleTalk cable VLAN, you can

add them dynamically or statically:

• Dynamic ports

• Static ports

You also can explicitly exclude ports.

Dynamic Ports

Dynamic ports are added to a VLAN when you create the VLAN. owever, if a dynamically added port does not

receive any traffic for the VLAN’s protocol 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 protocol, the device

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 protocol, 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.

NOTE: You cannot configure dynamic ports in an AppleTalk cable VLAN. The ports in an AppleTalk cable VLAN

must be static. However, ports in an AppleTalk protocol VLAN can be dynamic or static.

Figure 16.7 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 other protocol types to “leak” through the VLAN.

See “Broadcast Leaks” on page 16-10.

Figure 16.7 VLAN with dynamic protocol ports—all ports are active when you create the VLAN

Ports in a new protocol VLAN that do not receive traffic for the VLAN’s protocol age out after 10 minutes and

become candidate ports.

User-configured port-based VLAN

Active Dynamic Ports

Active Ports

Candidate Ports

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