Avaya Configuring Ethernet, FDDI, and Token Ring Services Instrukcja Użytkownika Pobierz pdf (Strona 40)

Configuring Ethernet, FDDI, and Token Ring Services

3-4 117020-A Rev. A

Enabling or Disabling Hardware Filtering

When you add a FDDI circuit for a link module with hardware ﬁlter capability,

Site Managers displays the prompt

Do you want to enable Hardware Filters on this circuit?

Hardware ﬁltering is disabled by default, but changes to enabled if you reply OK

to this prompt.

With hardware ﬁltering enabled, the FDDI interface drops local frames instead of

copying them into system memory to be processed by the bridge software. Local

frames are frames that contain both destination and source MAC addresses that

the router has learned on the interface. Bridge software teaches the hardware ﬁlter

which MAC addresses are local to an interface.

Enabling hardware ﬁltering improves bridging software performance, since the

router software does not need to determine whether to receive and reject local

frames.

You can enable or disable hardware ﬁltering on an interface. Set to Enable only if

the FDDI link module has hardware ﬁlters and you enabled bridge software.

Editing FDDI SMT Attributes

The FDDI Station Management (SMT) standard deﬁnes the protocols for

managing the Physical Layer Media Dependent (PMD), the Physical Layer

Protocol (PHY), and the Media Access Control (MAC) components of FDDI. The

SMT protocols monitor and control the activity of each node on the ring. Bay

Networks routers support Version 7.2 of the SMT protocol. SMT contains three

components:

• Connection Management (CMT)

• Ring Management (RMT)

• SMT frame services

Site Manager: Hardware Filter parameter: page A-7

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Avaya Configuring Ethernet, FDDI, and Token Ring Services Instrukcja Użytkownika Strona 40