iSNS Cloud Discovery
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
When an iSNS server receives a query request, it responds with a list of available targets and the portals
through which the initiator can reach the target. The IP network configuration outside the MDS switch
may result in only a subset of Gigabit Ethernet interfaces being reachable from the initiator. To ensure
that the set of portals returned to the initiator is reachable, the iSNS server needs to know the set of
Gigabit Ethernet interfaces that are reachable from a given initiator.
The iSNS cloud discovery feature provides information to the iSNS server on the various interfaces
reachable from an initiator by partitioning the interfaces on a switch into disjointed IP clouds. This
discovery is achieved by sending messages to all other known IPS ports that are currently up and,
depending on the response (or the lack of it), determines if the remote IPS port is in the same IP network
or in a different IP network.
Cloud discovery is initiated when the following events occur:
The iSNS server distributes cloud and membership information across all the switches using CFS.
Therefore, the cloud membership view is the same on all the switches in the fabric.
For CFS distribution to operate correctly for iSNS cloud discovery, all switches in the fabric must be
running Cisco SAN-OS Release 3.0(1) or later.
Configuring iSNS Cloud Discovery
This section describes how to configure iSNS cloud discovery and includes the following topics:
Enabling iSNS Cloud Discovery
To enable iSNS cloud discovery, follow these steps:
switch# config t
Cisco MDS 9000 Family CLI Configuration Guide
Manual requests from the CLI initiate cloud discovery from the CLI. This action causes the
destruction of existing memberships and makes new ones.
Auto-discovery of the interface results in an interface being assigned to its correct cloud. All other
cloud members are not affected. The membership of each cloud is built incrementally and is initiated
by the following events:
A Gigabit Ethernet interface comes up. This can be a local or remote Gigabit Ethernet interface.
The IP address of a Gigabit Ethernet interface changes.
The VRRP configuration on a port changes.
Enabling iSNS Cloud Discovery, page 42-94
Initiating On-Demand iSNS Cloud Discovery, page 42-95
Configuring Automatic iSNS Cloud Discovery, page 42-95
Verifying Automatic iSNS Cloud Discovery Configuration, page 42-95
Configuring iSNS Cloud Discovery Distribution, page 42-95
Configuring iSNS Cloud Discovery Message Types, page 42-95
Enters configuration mode.
OL-16184-01, Cisco MDS SAN-OS Release 3.x