The L3 hash table is introduced in Introduction to Hardware Forwarding Tables. The L3 hash table stores entries for IPv4 routes, IPv4 and IPv6 hosts, and IPv4 and IPv6 multicast groups. For multicast, L3 hash table supports <S,G,V> and <*,G,V> lookups. The entry from this table provides an index to IP Multicast Group table.
To make more space available in the L3 hash table for IPv4 and IPv6 multicast groups, you can do the following:
For more information, see the description for the GUID-F34E2331-3C14-4D5D-AF04-753C5A078CCC command.
Note
To benefit from the use of the external LPM tables, you must leave the IP multicast compression feature enabled, which is the default setting.
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