Configuration Guide User guide
394 FastIron Configuration Guide
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TCAM space on FCX device configuration
TCAM space on FCX device configuration
FCX devices store routing information for IPv4 and IPv6 and GRE tunnel information in the same
TCAM table. You can configure the amount of TCAM space to allocate for IPv4 routing information
and GRE tunnels. The remaining space is allocated automatically for IPv6 routing information.
FCX devices have TCAM space to store 16,000 IPv4 route entries. Each IPv6 route entry and GRE
tunnel use as much storage space as four IPv4 route entries. The default, maximum, and minimum
allocation values for each type of data are shown in Table 65.
Allocating TCAM space for IPv4 routing information
For example, to allocate 13,512 IPv4 route entries, enter the following command:
Brocade(config)# system-max ip-route 13512
Syntax: system-max ip-route <routes>
The <routes> parameter specifies how many IPv4 route entries get allocated. The command output
shows the new space allocations for IPv4 and IPv6. You must save the running configuration to the
startup configuration and reload the device for the changes to take effect.
After the device reloads, the space allocated for IPv4 and IPv6 routing information appears in the
device running configuration in this format:
system-max ip-route 13512
system-max ip6-route 514
NOTE
If you disable IPv6 routing, the TCAM space allocations do not change. If you want to allocate the
maximum possible space for IPv4 routing information, you must configure the TCAM space
manually.
Allocating TCAM space for GRE tunnel information
For example, to allocate space for 64 GRE tunnels, enter the following command at the Privileged
EXEC level:
Brocade#system-max gre-tunnels 64
Syntax: system-max gre-tunnels <tunnels>
The <tunnels> parameter specifies the number of GRE tunnels to allocate.
TABLE 65 TCAM space allocation on FCX devices
Default Maximum Minimum
IPv4 route entries 12000 15168 4096
IPv6 route entries 908 2884 68
GRE tunnels 16 64 16