AB291A Fabric Clustering System Support Guide (12-port Switch), April 2004

HP 12-Port 4X Fabric Copper Switch Commands
HP Fabric Clustering System Commands
Appendix B
237
Command Modes:
Global-configuration mode.
Privilege Level:
General read-write user.
Usage Guidelines:
This is an HP Fabric Clustering System Subnet Management Configuration Command.
The subnet manager:
• discovers the subnet topology and dynamically updates it at a specified sweep interval
• configures the LIDs, GID subnet prefixes, and P_Keys for each channel adapter port
• configures the LIDs, subnet prefixes, and forwarding databases for each switch on the subnet
• maintains the endnode and service databases of the subnet, providing a GUID to LID/GID resolution
service as well as a services directory.
One subnet manager is used to administer the fabric. All fabric hosts are on this one subnet. Upon bootup, the
subnet manager image is loaded and ready.
Each node in the fabric has a subnet management agent (SMA) to shuttle communication requests between
the node and the subnet manager. Communication between the subnet manager and the subnet management
agent is done using the common management datagram (MAD) message structure. This structure entails the
passing of subnet management packets (SMP).
There is a limit to the number of MAD packets that may be queued for a single file descriptor. Once the queue
reaches its maximum length (currently set to 8), new packets are dropped. This prevents “livelock” in the
situation where new MADs arrive faster than they can be processed.
The subnet management agent receives and transmits subnet management packets to and from the subnet
manager. The subnet management packets never extend beyond their respective local HP Fabric Clustering
System subnet. Also, SMPs always use Virtual Lane 15 (VL15) and are exclusively addressed to Queue Pair 0
(QP0).
Regarding Partitions:
Partitions are created, and then ports are added to those Partitions to enforce isolation. For more information
regarding creating Partitions, refer to .
NOTE HP recommends that the default partition be used for the cluster.
You can choose your own p_key values, or you can simply choose your values from the list in the following
table.”
Table B-47 Acceptable P_Key Values
00:01 00:11
00:02 00:12
00:03 00:13
00:04 00:14