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Data Link Switching Overview

304233-A Rev. 00

1-5

UDP Explorer Frames

If a TCP/IP session is not active, the local router can send UDP explorer frames

across the network to locate the destination media access control (MAC) address.

When the local router finds the destination MAC address, the destination router

returns a UDP response. The local router, as well as the router returning the UPD

response, then establish a TCP/IP session between them. Using UDP explorer

frames allows the sending router to “explore” the network before opening a TCP

session, enabling routers to support a larger network.

TCP/IP sessions between routers establish across the network when a router

locates a destination MAC address. When established, a TCP/IP session remains

active between the routers until there are no remaining SNA/NetBIOS sessions, or

until a TCP connection is idle over a configured time period.

If the local router cannot find the destination MAC address (no UDP response),

the local router establishes TCP sessions with all entries in the Peer Table using

either RFC 1795 or RFC 1434 protocol standards if the destination MAC is an

unknown peer type.

You can configure DLSw to use UDP explorer frames to establish TCP/IP

sessions with DLSw peers by setting the Transport Type parameter, described in

Appendix A, “DLSw Service Parameters.”

TCP, UDP, and Unknown Peer Types

With DLSw Version 2 unicast, you can configure DLSw peers as TCP, UDP, or

Unknown. If the peer type is unknown, the local router sends UDP explorer

frames to establish a connection. If the local router does not receive a UDP

response after a number of attempts, the local router will try to fall back to earlier

DLSw RFCs to establish the connection.

If the peer type is TCP, then a TCP connection establishes when you start the local

router. If the peer is UDP, a TCP connection establishes after the UDP explorer

frames are correctly exchanged.

For information on the Transport Type and SNA Fallback Attempts parameters,

refer to Appendix A, “DLSw Service Parameters.”

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Avaya Configuring DLSw Services Manual do Utilizador Página 27