| Description | A control table used to query the switching engine by
specifying retrieval criteria for IP multicast L3 flows.
Each row instance in the table represents a query with
its parameters. The resulting data for each instance of
a query in this table is returned in the
cseFlowMcastResultTable.
The maximum number of entries (rows) in this table cannot
exceed the value of cseFlowMcastMaxQueries object.
Unlike unicast switched layer 3 flows, an IP multicast
switched flow is created and installed by software, and
is uniquely identified by flow's source IP address, and
multicast group IP address. It is stored with input Vlan
ID in the cache entry, so that the packets in the flow
will not be replicated and forwarded to the receivers on the
same (input) Vlan.
Another difference is that all IP multicast hardware
switched flows belonging to the same (source, group) are
stored only on one switch engine on a Cisco L3 switch with
distributed switch engines, whereas unicast flows identified
by certain criterion may resident on multiple switch engines
in the system. |