Jane.doe: Created page with "A '''virtual circuit''' is a common transport that provides port-to-port communication in an OpenVMS cluster at the TR (transport) layer of the NISCA protocol...."

2019-11-08T13:38:20Z

Created page with "A '''virtual circuit''' is a common transport that provides port-to-port communication in an OpenVMS cluster at the TR (transport) layer of the NISCA protocol...."

New page

A '''virtual circuit''' is a common transport that provides port-to-port communication in an OpenVMS [[Cluster|cluster]] at the TR (transport) layer of the [[NISCA]] protocol. A virtual circuit is maintained by everyt port with every other remote port and ensures:
* the delivery of messages without duplication or loss
* the sequential ordering of messages by using virtual circuit sequence numbers on each transmitted message (duplicates are discarded).

Virtual circuits are layered on [[Channel|channels]] established between each pair of adapters. The choice of channel is determined by the sender ([[PEDRIVER]]) of the messages.

To examine information about the virtual circuit (VC) that carries messages between the local node (where you are running SDA) and another remote node, enter the [[SDA]] command SHOW PORT/VC=VC_remote-node-name.

The SHOW PORT/VC=VC_remote-node-name command displays a number of performance statistics about the virtual circuit for the target node. The display groups the statistics into general categories that summarize such things as packet transmissions to the remote node, packets received from the remote node, and congestion control behavior.

=See also=
* [https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04619857 Guidelines for OpenVMS Cluster Configurations]
* [https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04623183 OpenVMS Cluster Systems] see Appendix F

Virual Circuit - Revision history

Jane.doe: Created page with "A '''virtual circuit''' is a common transport that provides port-to-port communication in an OpenVMS cluster at the TR (transport) layer of the NISCA protocol...."