Avaya Configuring LLC Services Uživatelský manuál stáhnout pdf (Strana 20)

Configuring LLC Services

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117357-A Rev. A

Using LLC2 with SNA and NetBIOS

SNA needs a connection-oriented datalink layer for end-to-end packet sequencing

and error control. Over wide area networks (WANs), the Synchronous Data Link

Control (SDLC) protocol has traditionally met this need. However, in a LAN

environment, front-end processors (FEPs), controllers, and NetBIOS client/server

stations commonly use an LLC2 layer for this purpose. To support

communication among these devices, you can add LLC2 interfaces to a router

conﬁguration.

SNA devices and NetBIOS PCs use LLC when they establish sessions through a

LAN topology. SNA and NetBIOS need LLC2 connection-oriented circuits to

provide higher-layer sequencing and error control in bridged LAN environments.

LLC2 works much like SDLC in terms of packet sequencing and

acknowledgment. Unlike SDLC, it does not impose unbalanced,

primary/secondary relationships between communicating nodes. Any LLC station

can initiate a peer-to-peer conversation with any other LLC station.

Supported Connections

You conﬁgure LLC2 on any interface requiring local termination. These interfaces

include

• Interfaces conﬁgured with APPN

• Interfaces conﬁgured with DLSw

When you connect over an IP backbone in dual-switch DLSw conﬁgurations,

the interface attached to the IP backbone does not use LLC2. When you

connect over an LLC2 backbone in DLSw single-switch conﬁgurations, the

interface attached to the backbone uses LLC2.

• Token Ring interfaces running LNM

You can enable LLC2 on any LAN or WAN interface that supports APPN, DLSw,

and LNM. These interfaces include

• LAN interfaces

-- Token Ring

-- Ethernet

-- Any other LAN media supporting Source Route Bridge, including FDDI

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Avaya Configuring LLC Services Uživatelský manuál Strana 20