Avaya Configuring SMDS Bedienungsanleitung PDF herunterladen (Seite 25)

Implementation Notes

117361-A Rev. A 2-3

Requirements for the Router and the DSU/CSU

The next sections provide conﬁguration requirements for the router and the

DSU/CSU to implement high-speed SMDS.

DXI Protocol Requirements

Version 3.2 of the DXI protocol manages the data exchange between the router

and the DSU/CSU. Because the router does not support earlier DXI versions, the

DSU/CSU must support DXI Version 3.2. DXI Version 3.2 provides an optional

heartbeat poll mechanism to periodically verify the router and DSU/CSU

connection. Be sure to enable heartbeat polling on the DSU/CSU.

The DXI also provides support for both 16-bit and 32-bit cyclic-redundancy

checks (CRCs). Network devices use CRCs to check data for transmission errors.

When the router or DSU/CSU receives data, each reads the CRC character and

compares the value it calculates to the actual CRC character in the data packet.

Ensure that the CRC values for the router and the DSU/CSU match. This means

that if you set the router to 16-bit CRCs, you must set the DSU/CSU to 16-bit

CRCs. If necessary, you can modify the CRC values (16-bit or 32-bit) for both

synchronous and HSSI connections.

Local Management Interface

The Local Management Interface (LMI) protocol works with the DXI to enable

the router and the DSU/CSU to exchange management information. The LMI uses

a subset of the Simple Network Management Protocol (SNMP) to provide for

router management queries, DSU/CSU responses to queries, and

DSU/CSU-generated asynchronous trap events.

Before enabling the LMI on the router, ensure that the DSU/CSU supports this

protocol and that you enable it on the DSU/CSU.

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Avaya Configuring SMDS Bedienungsanleitung Seite 25