About Rscn Information; Displaying Rscn Information; About The Multi-Pid Option; Configuring The Multi-Pid Option - Cisco Nexus 5000 Series Configuration Manual

Managing FLOGI, Name Server, FDMI, and RSCN Databases
• IP address change
• Any other similar event that affects the operation of the host

About RSCN Information

A switch RSCN (SW-RSCN) is sent to registered hosts and to all reachable switches in the fabric.
Note The switch sends an RSCN to notify registered nodes that a change has occurred. It is up to the nodes to
query the name server again to obtain the new information. The details of the changed information are
not delivered by the switch in the RSCN sent to the nodes.

Displaying RSCN Information

The following example shows how to display registered device information:
switch# show rscn scr-table vsan 1
Note The SCR table is not configurable. It is populated when hosts send SCR frames with RSCN information.
If hosts do not receive RSCN information, then the show rscn scr-table command will not return entries.

About the multi-pid Option

If the RSCN multi-pid option is enabled, then RSCNs generated to the registered Nx ports may contain more
than one affected port IDs. In this case, zoning rules are applied before putting the multiple affected port IDs
together in a single RSCN. By enabling this option, you can reduce the number of RSCNs. For example, you
have two disks (D1, D2) and a host (H) connected to switch 1. Host H is registered to receive RSCNs. D1,
D2, and H belong to the same zone. If disks D1 and D2 are online at the same time, one of the following
actions applies:
• The multi-pid option is disabled on switch 1— Two RSCNs are generated to host H: one for the disk
D1 and another for disk D2.
• The multi-pid option is enabled on switch 1—A single RSCN is generated to host H, and the RSCN
payload lists the affected port IDs (in this case, both D1 and D2).
Note Some Nx ports may not support multi-pid RSCN payloads. If so, disable the RSCN multi-pid option.

Configuring the multi-pid Option

To configure the multi-pid option, perform this task:
OL-xxxxx-xx
Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide
RSCN
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