H3C Technologies H3C S5830V2 Series Switches - Manual (Page 61)

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Configuring RSCN aggregation
RSCN
An FC switch uses a name service database to store information about registered nodes on the local
switch and on remote switches in the fabric. The switch sends Registered State Change Notifications
(RSCNs) to inform node information changes (node registration, node deregistration, or registration
information change). An RSCN includes only the FC address of the node where the change occurred.
When a change occurs, the switch sends ELS_RSCNs to its concerned registered nodes and SW-RSCNs
to all reachable switches in the fabric. After receiving an RSCN, a switch or node automatically sends a
name service query to obtain the new information. The switch receiving an RSCN also sends ELS_RSCNs
to notify their concerned registered nodes. As a result, the changed information is notified and updated
throughout the fabric.
NOTE:
•
Support for SW-RSCNs depends on the ESS negotiation between switches.
• Concerned registered nodes refer to the nodes that have sent SCR requests to the switch for receiving
RSCNs. Only these registered nodes can receive and respond to ELS_RSCNs.
RSCN aggregation
If changes occur on multiple nodes at the same time, the switch quickly sends multiple ELS_RSCNs for
each change to the concerned registered nodes. This can cause a sharp decline in transmission and
processing performance.
RSCN aggregation can alleviate the problem by using an RSCN aggregation timer. If multiple changes
occur within the RSCN aggregation timer, the switch sends the FC addresses of the nodes with changes
in one RSCN.
Configuration procedure
H3C recommends that you enable RSCN aggregation and set the same timer value on all switches in a
VSAN. The RSCN aggregation timer takes effect only when RSCN aggregation is enabled.
To configure RSCN aggregation:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VSAN view. vsan vsan-id N/A
3. Enable RSCN aggregation. rscn aggregation enable
By default, RSCN aggregation is
disabled.
4. Set the RSCN aggregation
timer.
rscn aggregation timer time
The default setting is 2000 ms.
You can adjust this timer to control the
frequency the switch responds to node
information changes based on switch
performance.