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.
|
URPF mode |
IPv6 mode |
IPv4 |
IPv6 |
|
|---|---|---|---|---|
|
Prefix less than 64 |
Prefix greater than 64 |
|||
|
No |
No |
15,488 |
7,744 |
n/a |
|
No |
Yes |
7,488 |
3,744 |
2,000 |
|
Yes |
No |
7,488 |
3,744 |
n/a |
|
Yes |
Yes |
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). |
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|
URPF mode |
IPv6 mode |
IPv4 |
IPv6 |
|
|---|---|---|---|---|
|
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). |
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