The default option configures the switch to store entries for local and remote IPv4 hosts in the LPM tables. On BlackDiamond 8000 a-, c-, and, e--series modules and Summit X440, and X460 switches, the default setting creates room for 48 local and remote IPv4 host entries. On BlackDiamond 8900-40GX-xm modules and Summit X670 and X770 switches, the default setting creates room for 4112 local and remote IPv4 host entries. On BlackDiamond 8900 xl-series modules and Summit X480 switches, the default setting creates room for 16384 local and remote IPv4 host entries. This option provides more room for IPv4 and IPv6 multicast and IPv6 hosts in the L3 Hash table.
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.
On BlackDiamond 8900 xl-series modules and Summit X480 switches, the default and maximum options automatically select a configuration that is compatible with the configuration defined by the configure forwarding external-tables command.
On BlackDiamond 8900 xl-series modules and Summit X480 switches, the number you specify for the num_routes_needed must be compatible with the configuration defined by the configure forwarding external-tables command. If you specify a number that is greater than the number of routes specified by the current configuration, an error message appears.
Note
If 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 when both IPv4 and IPv6 routes are stored in the Internal LPM table.
Print
this page
Email this topic
Feedback
View PDF
Download EPUB