Route Scaling

The following table provides information on IPv4 and IPv6 route scaling. The route table is a shared hardware resource where IPv4 routes consume one entry and IPv6 routes with a prefix length less than 64 consume two entries.

The route scaling does not depend on the protocol itself, but rather the general system limitation in the following configuration modes:

URPF check mode - Enable this boot configuration flag to support Unicast Reverse Path Forwarding check mode.
IPv6 mode - Enable this boot configuration flag to support IPv6 routes with prefix-lengths greater than 64 bits. When the IPv6-mode is enabled, the maximum number of IPv4 routing table entries decreases. This flag does not apply to all hardware platforms.

Note

Only 5320-48P-8XE and 5320-48T-8XE support URPF mode.

Table 1. 5320 Series
URPF mode	IPv6 mode	5320 Series
URPF mode	IPv6 mode	IPv4	IPv6 (prefix less than 64)	IPv6 (prefix greater than 64)
No	No	48-port models: 12K 16- and 24-port models: 8K	48-port models: 6K 16- and 24-port models: 4K	n/a
No	Yes	48-port models: 6K 16- and 24-port models:4K	48-port models: 2K 16- and 24-port models: 2K	48-port models: 1.5K 16- and 24-port models: 1K
Yes	No	48-port models: 6K	48-port models: 2K	n/a
Yes	Yes	48-port models: 3K	48-port models: 1K	48-port models: 750
Note: The total number of routes include local routes. The stated numbers in the preceding rows are one-dimensional where the given number implies that only routes for that address family or type are present. For a given row in the table, the maximum scaling number is ‘x‘ IPv4 routes OR ‘y‘ ipv6 <= 64 routes (not a combination of both).

Table 2. 5420 Series
URPF mode	IPv6 mode	5420 Series
URPF mode	IPv6 mode	IPv4	IPv6 (prefix less than 64)	IPv6 (prefix greater than 64)
No	No	12K	6K	n/a
No	Yes	6K	2K	1,500
Yes	No	6K	3K	n/a
Yes	Yes	3K	1K	750
Note: The total number of routes include local routes. The stated numbers in the preceding rows are one-dimensional where the given number implies that only routes for that address family or type are present. For a given row in the table, the maximum scaling number is ‘x‘ IPv4 routes OR ‘y‘ ipv6 <= 64 routes (not a combination of both).

Table 3. 5520 Series
URPF mode	IPv6 mode	5520 Series
URPF mode	IPv6 mode	IPv4	IPv6 (prefix less than 64)	IPv6 (prefix greater than 64)
No	No	16K	8K	n/a
No	Yes	8K	4K	2K
Yes	No	8K	4K	n/a
Yes	Yes	4K	2K	1K
Note: The total number of routes include local routes. The stated numbers in the preceding rows are one-dimensional where the given number implies that only routes for that address family or type are present. For a given row in the table, the maximum scaling number is ‘x‘ IPv4 routes OR ‘y‘ ipv6 <= 64 routes (not a combination of both).