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.

Table 1. VSP 4450 Series, VSP 4900 Series, VSP 7200 Series, and VSP 8000 Series
URPF mode	IPv6 mode	VSP 4450 Series			VSP 7200 Series, VSP 4900 Series, and VSP 8000 Series
		IPv4	IPv6		IPv4	IPv6
		IPv4	Prefix less than 64	Prefix greater than 64	IPv4	Prefix less than 64	Prefix greater than 64
No	No	15,744	7,887	256	15,488	7,744	n/a
No	Yes	n/a	n/a	n/a	7,488	3,744	2,000
Yes	No	7,744	3,872	256	7,488	3,744	n/a
Yes	Yes	n/a	n/a	n/a	3,488	1,744	2,000
Note: 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 OR ‘z‘ ipv6 >64 routes (not a combination of all).

Table 2. VSP 7400 Series
URPF mode	IPv6 mode	VSP 7400 Series
		IPv4	IPv6
		IPv4	Prefix less than 64	Prefix greater than 64
No	No	15,000	7,000	n/a
No	Yes	7,000	3,500	2,000
Yes	No	7,000	3,500	n/a
Yes	Yes	3,000	1,500	1,000
Note: 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 OR ‘z‘ ipv6 >64 routes (not a combination of all).

Table 3. XA1400 Series
IPv4 BGP routes (control plane only)	15,488
IPv4 OSFP routes	15,488
IPv4 RIP routes	15,488
IPv4 routes	15,488
IPv4 SPB Shortcut routes	15,488