Open Stack

Hi All,

          I have created a subnet with 10 ips. But now I need more than ten
instances, is there any way to extend the subnet to add ip address?
          eg:
          I have ten ips as following:
                172.16.2.210  ~ 172.16.2.220

          I want to add 20 more ips, and so the result will be
                172.16.2.210 ~ 172.16.2.230

         I try subnet-update command and create a new subnet with the same
CIDR, but it doesn't work correctly.

         Thanks in advance.
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