ExtremeXOS allows you to store IPv6 routes and hosts in external LPM tables. You can configure the external LPM to contain IPv4 or IPv6 routes, or both. Internal LPM tables can store IPv4 or IPv6 routes, both, or neither, based on the configuration setting for external-tables.
The configure forwarding external-tables l3-only command using the ipv6 and ipv4-and-ipv6 variables supports larger IPv6 route and host scaling in external LPM tables.
When an external LPM table is configured for l3-only ipv6, no IPv6 routes or IPv6 hosts are stored in any of the internal hardware tables. This provides the highest IPv6 scale, and avoids contention with IP Multicast in the L3 Hash hardware table.
IPv6 hardware and slowpath forwarding are supported on user-created Virtual Routers, and IPv6 tunnels are only supported on VR-Default.
The size of the internal LPM tables, and the size of the L3 Hash and Next Hop tables are fixed for some platforms. The following tables list the hardware capacity for each of the tables shown in Hardware Forwarding Tables.
Summit X670-G2 and X770 series switches have hardware forwarding tables internal to the switch chips that can be partitioned in a flexible manner. The Summit X670-G2 and X770 switches have the following configurable internal tables:
| L3 Characteristic | l2-and-l3 | more l3-and-ipmc | more l2 | |
|---|---|---|---|---|
| L3 Hash IPv4 Unicast | 96K | 128K | 16K | |
| L3 Hash IPv6 Unicast | 48K | 48K | 8K | |
| Next Hop | 48K | 48K | 48K | |
| Internal IPv4 LPM | 16K | 16K | 16K | |
| Internal IPv6 LPM | 8K | 8K | 8K | |
| IPv4 hosts with min LPM routes (assumes 75% utilization of L3 hash table) | 82K | 106K | 28K | |
| IPv4 hosts with max LPM routes (assumes 75% utilization of L3 hash table) | 72K | 96K | 12K | |
|
Remote IPv4 Host Entries (assumes 75% utilization of L3 hash table) |
124K | 172K | 28K | |
| IPv6 Host Entries (assumes 75% utilization of L3 hash table) | 36K | 36K | 6K | |
| IP multicast groups | 4K | 4K | 4K | |
| IP-multicast (s,v,g) entries (will depend on hash utilization) | 72K | 104K | 16K | |
The Summit X460-G2, has hardware forwarding tables internal to the switch chips that can be partitioned in a flexible manner. The Summit X460-G2 has the following configurable internal tables:
| L3 Characteristic | l2-and-l3 | more l3-and-ipmc | more l2 | |
|---|---|---|---|---|
| L3 Hash IPv4 Unicast | 40K | 56K | 16K | |
| L3 Hash IPv6 Unicast | 24K | 32K | 8K | |
| Next Hop | 32K | 32K | 32K | |
| Internal IPv4 LPM | 12K | 12K | 12K | |
| Internal IPv6 LPM | 6K | 6K | 6K | |
| IPv4 hosts with min LPM routes (assumes 75% utilization of L3 hash table) | 38K | 50K | 24K | |
| IPv4 hosts with max LPM routes (assumes 75% utilization of L3 hash table) | 30K | 42K | 12K | |
|
Remote IPv4 Host Entries (assumes 75% utilization of L3 hash table) |
48K | 72K | 24K | |
| IPv6 Host Entries (assumes 75% utilization of L3 hash table) | 18K | 24K | 6K | |
| IP multicast groups | 4K | 4K | 4K | |
| IP-multicast (s,v,g) entries (will depend on hash utilization) | 24K | 40K | 8K | |