Extended IPv4 Host Cache Management Guidelines
When configuring the extended IPv4 host cache feature, consider the following guidelines:
The default option configures the switch to store entries for local and remote IPv4 hosts in the LPM tables.
The maximum option reserves all space in the LPM tables for IPv4 and IPv6 routes. This option provides the maximum storage for IPv4 and IPv6 routes when you do not expect to store many IPv4 and IPv6 multicast and IPv6 hosts in the L3 Hash table.
NoteIf no IPv4 route is found in the LPM table and IPv4 unicast packets are slow-path forwarded for a given remote host, an IPv4 entry is created for the remote host in either the L3 hash table or LPM table. The hardware does not cache entries for remote IPv6 hosts, so IPv6 routes take precedence over IPv4 routes.