H3C Technologies H3C S12500-X Series Switches - Manual (Page 47)

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Step Command Remarks
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.
Configuring and obtaining FC4 information of
nodes
After a node registers with a switch through a FLOGI, the node sends a name service registration request
to the switch to register extended information, which includes FC4 information.
FC4 information includes the following fields to describe the FC4-layer protocol supported by a node
and the feature of the supported protocol:
• FC4-Type—FC4-layer protocol supported by a node, including SCSI-FCP, IP, SNMP, and NPV.
• Feature—Feature of the supported FC4-layer protocol. Each FC4-layer protocol can include one of
the four Features and defines the meaning of each Feature.
Before communicating with other nodes, a node obtains information about all nodes that support
SCSI-FCP from the switch. You can use the display fc name-service database command to display the
FC4 information of nodes in the name service database.
When registering extended information:
• A server registers SCSI-FCP for FC4-Type and Initiator for Feature.
• A disk device registers SCSI-FCP for FC4-Type and Target for Feature.
As a result, servers can determine the disk devices to send access requests after obtaining information
about nodes supporting SCSI-FCP.
Enabling auto discovery of SCSI-FCP information
In some situations, for example, when a node logs out and then logs back in, the node does not register
SCSI-FCP support. Therefore, the node does not have a Feature value. This might cause communication
failure between the node and other nodes.
When this feature is enabled, the switch automatically obtains the SCSI-FCP support and the Feature
value by sending a PRLI packet to the node that is logging in. Then, the switch stores the SCSI-FCP
information in the name service database.
NOTE:
After this feature is enabled, nodes with older-model HBAs might not actively register name service
information with the switch.
To enable auto discovery of SCSI-FCP information: