<p>This article describes&nbsp;limitations of Ping An Cloud ELB.</p> <p>&bull; Each listener of an ELB instance must use a unique port number.</p> <p>&bull;&nbsp;You can create an ELB instance successfully only if the server resource pool has only one ECS. When you remove the last ECS in the pool, the system automatically deletes the server resource pool.</p> <p>&bull;&nbsp;The automatic optional bandwidth is in the range of&nbsp;1 to 500, in&nbsp;Mbps.</p> <p>&bull;&nbsp;External ELB instances support&nbsp;only the DMZ network domain.</p> <p>&bull;&nbsp;Internal ELB instances support the&nbsp;DMZ, SF, and PTR network domains.</p> <p>The following table lists the&nbsp;ELB quotas:</p> <table border="1" cellpadding="0" cellspacing="0"> <tbody> <tr> <td style="background-color:#ededed; vertical-align:top"> <p><strong>Item</strong></p> </td> <td style="background-color:#ededed; vertical-align:top; width:405px"> <p><strong>Description</strong></p> </td> <td style="background-color:#ededed; vertical-align:top; width:115px"> <p><strong>Upper limit</strong></p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of ELB instances per tenant</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of instances that can be created by each tenant</p> </td> <td style="vertical-align:top; width:115px"> <p>50</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of ELB instances per VPC</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of instances that can be created in each VPC</p> </td> <td style="vertical-align:top; width:115px"> <p>50</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of listeners per&nbsp;instance</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of listeners that can be created in&nbsp;each ELB instance</p> </td> <td style="vertical-align:top; width:115px"> <p>200</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of resource pools</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of resource pools that each tenant can have</p> </td> <td style="vertical-align:top; width:115px"> <p>50</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of servers</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of servers that can be added to each ELB backend</p> </td> <td style="vertical-align:top; width:115px"> <p>200</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of server additions</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of pools that can be added repeatedly on the same server</p> </td> <td style="vertical-align:top; width:115px"> <p>50</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of access control entries</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of policy entries that each access control policy group can contain</p> </td> <td style="vertical-align:top; width:115px"> <p>300</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of policy groups</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of policy groups that each tenant can create</p> </td> <td style="vertical-align:top; width:115px"> <p>50</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of policy group IP entries</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of IP entries added to the policy group at a time</p> </td> <td style="vertical-align:top; width:115px"> <p>50</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of policy group associations</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of monitors that can be bound to each access control policy group</p> </td> <td style="vertical-align:top; width:115px"> <p>50</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Port range</p> </td> <td style="vertical-align:top; width:405px"> <p>Optional port number range for ELB instance monitoring</p> </td> <td style="vertical-align:top; width:115px"> <p>1 to 65535</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Number of certificates (tenant dimension)</p> </td> <td style="vertical-align:top; width:405px"> <p>Number of SSL certificates that can be uploaded by each tenant</p> </td> <td style="vertical-align:top; width:115px"> <p>30</p> </td> </tr> </tbody> </table> <p>&nbsp;</p>