IPv6 Routes and Hosts in External Tables

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:

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Summit X670-G2 and X770 Hardware Routing Table Configuration Capacities for Platforms with Configurable L2/L3 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:

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Summit X460-G2 Hardware Routing Table Configuration Capacities for Platforms with Configurable L2/L3 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