ZyXEL Communications VES-1012 - Guia do Utilizador descarregar pdf (Página 44)

VES-1000 Series Ethernet Switch

5-4 Getting Started Screens

Age), the bridge assumes that the link to the root bridge is down. This bridge then initiates negotiations with other

bridges to reconfigure the network to re-establish a valid network topology.

5.4.3 STP Port States

STP assigns five port states (see next table) to eliminate packet looping. A bridge port is not allowed to go directly

from blocking state to forwarding state so as to eliminate transient loops.

Table 5-3 STP Port States

PORT STATE DESCRIPTION

Disabled STP is disabled (default).

Blocking Only configuration and management BPDUs are received and processed.

Listening All BPDUs are received and processed.

Learning All BPDUs are received and processed. Information frames are submitted to the learning

process but not forwarded.

Forwarding All BPDUs are received and processed. All information frames are received and forwarded.

5.5 GARP Timer

GARP (Generic Attribute Registration Protocol) allows network devices to register and de-register attribute values

with other GARP participants within a bridged LAN. GARP is a protocol that provides a generic mechanism for

protocols that serve a more specific application, for example, GVRP (GARP VLAN Registration Protocol). GARP

and GVRP are the protocols used to automatically register VLAN membership across switches.

Switches join VLANs by making a declaration. A declaration is made by issuing a Join message using GARP.

Declarations are withdrawn by issuing a Leave message. A Leave All message terminates all registrations. GARP

timers set declaration timeout values.

5.6 Switch Setup Screen

Use the Switch Setup screen to set up and configure the line card’s switching features such as IGMP snooping and

priority queues.

Click Switch Setup in the navigation panel to open this screen.

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ZyXEL Communications VES-1012 - Guia do Utilizador Página 44