HP Cisco Nexus 5000 Cisco MDS 9000 Family CLI Configuration Guide - Release 4. - Page 1131

Chapter 43 Configuring iSCSI iSNS Send documentation comments to [email protected] initiator. The iSNS server will subsequently use the iSCSI target configuration(s) (virtual target and dynamic import configuration) to translate the Fibre Channel target to an equivalent iSCSI target. At this stage it also applies any access control configured for the virtual target. A response message with the target details is then sent back to the query initiator. The iSNS server sends a consolidated response containing all possible targets and portals to the querying initiator. For example, if a Fibre Channel target is exported as different iSCSI targets on different IPS interfaces, the iSNS server will respond with a list of all possible iSCSI targets and portals. In order to keep the list of targets updated, the iSNS server sends state change notifications (SCN) to the client whenever an iSCSI target becomes reachable or unreachable. The client is then expected to rediscover its list of accessible targets by initiating another iSNS query. Reachability of iSCSI targets changes when any one of the following occurs: • Target goes up or down. • Dynamic import of FC target configuration changes. • Zone set changes. • Default zone access control changes. • IPS interface state changes. • Initiator configuration change makes the target accessible or inaccessible. Verifying the iSNS Server Configuration Use the show isns config command to view the ESI interval and the summary information about the iSNS database contents (see Example 43-25). Example 43-25 Displays the iSNS Server Configuration of ESI Interval and Database Contents switch# show isns config Server Name: switch1(Cisco Systems) Up since: Fri Jul 30 04:08:16 2004 Index: 1 Version: 1 TCP Port: 3205 fabric distribute (remote sync): ON ESI Non Response Threshold: 5 Interval(seconds): 60 Database contents Number of Entities: 2 Number of Portals: 3 Number of ISCSI devices: 4 Number of Portal Groups: 0 Use the show isns database command to view detailed information about the contents of the iSNS database (see Example 43-26 through Example 43-29). This command displays the full iSNS database giving all the entities, nodes, and portals registered in the database. This command without options only displays explicitly registered objects. The asterisk next to the VSAN ID indicates that the iSCSI node is in the default zone for that VSAN. Example 43-26 Displays Explicitly Registered Objects switch# show isns database Entity Id: dp-204 Index: 2 Last accessed: Fri Jul 30 04:08:46 2004 iSCSI Node Name: iqn.1991-05.comdp-2041 Entity Index: 2 Node Type: Initiator(2) Node Index: 0x1 OL-18084-01, Cisco MDS NX-OS Release 4.x Cisco MDS 9000 Family CLI Configuration Guide 43-87