Netgear XCM8810 Chassis Hardware Installation Guide - Page 837

NETGEAR 8800 Chassis Switch CLI Manual configure iproute reserved-entries configure iproute reserved-entries [ | maximum | default ] slot [all | ] Description Reserves storage space for IPv4 and IPv6 routes in the Longest Prefix Match (LPM) hardware tables, allowing individual local and remote IPv4 unicast hosts to occupy the unused portions of the tables. Syntax Description num_routes_needed maximum default all slot_num Specifies a specific number of routes to reserve. Reserves the maximum amount of space for IP route entries. No IPv4 hosts are stored in the LPM and External tables. Reserves the default amount of space for IP route entries. This option applies the reservation to all applicable slots. This option applies the reservation to the specified slot. Default The default value is 12240. Usage Guidelines Demand on the Layer 3 Hash table can be reduced by allowing IPv4 hosts to be stored in the LPM tables instead. This command allows you to reserve a portion of the LPM tables for routes, and this creates an unreserved portion that can be used to store IPv4 hosts. For more information, see the "Extended IPv4 Host Cache" section in the NETGEAR 8800 User Manual. The default setting can support most networks, but if more than a few hundred local IP hosts and IP multicast entries are present, you can improve switch performance by calculating and configuring the reserved space for route entries to allow unreserved space for IPv4 hosts. Changing the number of reserved route entries does not require a reboot of the affected slots or switches. You can view the current LPM hardware table usage by entering the show iproute reserved-entries statistics command. The LPM table statistics are in the columns under the In HW Route Table heading. If the switch contains fewer routes than the capacity of the LPM tables, the number of route entries to reserve for a slot or switch should be the number of routes currently used in the hardware tables, plus an additional cushion for anticipated growth. Because each IPv6 route takes up the space of two IPv4 routes, the number of route entries to reserve is two times the value in the IPv6 routes column, plus the value in the IPv4 routes column, plus room for Chapter 19. IP Unicast Commands | 837