Netgear XCM8806 Chassis Hardware Installation Guide - Page 838

NETGEAR 8800 Chassis Switch CLI Manual anticipated growth. For example, if you want to reserve space for 100 IPv4 routes and 20 IPv6 routes, the required number of route entries is 140 (100 + 2*20). Note: On a NETGEAR 8800 switch, the capacity of the LPM table is 4,096 higher than the capacity for local IPv4 or IPv6 hosts. Therefore, on such hardware, there is no need to configure fewer than 4096 reserved route entries. The maximum value for num_routes_needed is 12256. When maximum is specified, IPv4 hosts do not occupy LPM table space. Note that when maximum is specified, software forwarding can result, depending on the utilization and addresses in the Layer 3 Hash table, and is therefore not recommended. If the switch contains more routes than the capacity of the LPM tables, say 700 routes on an 8800 module, a trade-off can be made. You can choose to reserve 400 iproute entries, for example. The 400 IPv4 routes with the longest length network masks will be installed in the LPM table, and the remainder of the LPM table can be used for cache space for local and remote hosts. The remote host entries are only required for IPv4 addresses matching one of the 300 routes not installed in the LPM table. Since not all 700 routes can be stored on an 8800 module anyway, leaving appropriate room for individual remote hosts can result in more fast-path forwarding. Depending on the actual routes present, IP route compression can be enabled to reduce the number of routes required in the LPM tables. For more information, see the description for the following command: enable iproute compression {vr } Example The following command reserves up to 140 IPv4 routes or 70 IPv6 routes, or any combination in between: configure iproute reserved-entries 140 slot all For details on the configuration changes, see the command descriptions for the following commands: show iproute reserved-entries show iproute reserved-entries statistics configure iproute sharing max-gateways configure iproute sharing max-gateways Description Depending on the platform, this command configures one of the following: 838 | Chapter 19. IP Unicast Commands