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Configuring DLSw Services

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304233-A Rev. 00

DLSw Backup Peer Support

If a TCP connection to the primary peer cannot be established, DLSw can

establish a TCP connection to a backup peer, if one is configured. When DLSw

starts up, if a TCP connection to the primary peer cannot be established, DLSw

checks whether a backup peer IP address is configured, and then initiates a new

TCP connection to the backup peer. The TCP connection to the backup peer

remains established as long as it is needed or until the maximum up time period

has expired, in which case the TCP connection is brought down. DLSw will bring

down a backup peer connection if there are no established DLSw connections or if

the DLSw connections are idle (i.e., no data has passed).

If a TCP connection with the primary peer is established, but then the primary

peer goes down, DLSw attempts to start another SNA session by sending a

message to the primary peer. If the TCP connection with the primary peer does not

re-establish, the DLSw checks whether a backup peer is configured, and then

initiates a new TCP connection to the backup peer.

You can configure backup peers for the following DLSw versions: RFC 1434,

RFC 1795, DLSw Version 2.0 (Unicast), or RFC 2166 (Multicast). You select a

version using the DLSw RFC Version parameter from the DLSw Basic Global

Parameters window. For instructions on using this parameter, refer to Chapter 3.

For instructions on configuring a backup peer for RFC 2166 (Multicast) and

configuring a backup peer for the other DLSw versions, refer to Chapter 4,

“Customizing DLSw Services.”

DLSw Filtering

Bay Networks provides two prioritization mechanisms that affect DLSw traffic:

• DLSw prioritization

• Protocol prioritization

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