# Setting the Mask Value for IP and IPv6 Rate-Limit Profiles

You can use the mask-val command to set the mask value used for IP and IPv6 rate-limit profiles.5.2.0b1 ID-2170 Use the mask values to set the appropriate bits in the ToS field of the IP packet header or in the traffic class field of the IPv6 packet header. The no version restores the default value, 255. This command is associated with the committed-action, conformed-action. and exceeded-action commands.

- Issue the mask-val command from Rate Limit Profile Configuration mode:
  host1(config-rate-limit-profile)#mask-val 0xFC

#### Related Documentation

- mask-val