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DLSw Implementation Notes

304233-A Rev. 00

2-21

Backup Peers

The backup peer feature allows you to use a backup peer if the TCP connection to

the primary peer cannot be established. 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 (that is, if no data has passed).

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, see Appendix A,

“DLSw Service Parameters.”

To configure backup peers, you select Yes at the Backup Config parameter on the

DLSw Multicast Configuration window or the DLSw Peer Configuration window.

This enables the rest of the backup peer parameters.

The Backup Peer Type parameter defines how the session attempts to establish a

TCP connection using the backup peer. The valid values are:

• RFC 1795 -- Send the request for connection over TCP only

• V2.0 (Unicast - TCP) -- Send the request for connection over TCP only.

• V2.0 (Unicast - Unknown) -- Send the request for connection over UDP; the

backup peer can fall back to RFC 1795 mode.

• V2.0 (Unicast - UDP) -- Send the request for connection over UDP, one TCP

connection is expected; the backup peer cannot fall back to RFC 1795 mode.

• RFC 2166 (Multicast) -- Send the request for connection to the multicast

address configured in the Backup IP Address field.

The Backup Peer Type cannot exceed the global DLS RFC type on the router. For

example, if the DLSw global RFC type for the router is RFC 2166 (Multicast), the

backup peer can be any of the available values. If the RFC type is V2.0 Unicast,

the backup peer cannot be multicast. If the RFC type is RFC 1795, the backup

peer cannot be multicast, V2.0 UDP, V2.0 Unknown, or V2.0 TCP.

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

other DLSw versions, see Chapter 4, “Customizing DLSw Services.”

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