This topic describes the limits on Classic Load Balancer (CLB).
Basic settings
Item | Limits | Adjustable |
---|---|---|
Limits on CLB instances | You can navigate to the Quota Management page to request a quota increase. For more information, see Manage service quotas. | |
Maximum number of CLB instances that you can create with an Alibaba Cloud account | 30 | |
Maximum number of CLB instances that can be associated with an Elastic Compute Service (ECS) instance | 50 | |
Maximum number of backend servers that can be added to a CLB instance | 200 | |
Maximum number of listeners that can be configured for a CLB instance | 50 | |
Maximum number of domain name-based and URL-based forwarding rules that can be added to an HTTP or HTTPS listener | 40 | |
Maximum number of additional certificates that can be created for an HTTPS listener | 3 | |
Range of frontend or backend ports that can be specified for a CLB listener (Alibaba Cloud) | 1~65535 | |
Range of frontend or backend ports that can be specified for a CLB listener (Alibaba Finance Cloud) |
| |
Limits on certificates | ||
Maximum number of server certificates that can be uploaded in a region | 100 | |
Maximum number of client CA certificates that can be uploaded in a region | 100 | |
Limits on network access control lists (ACLs) | ||
Maximum number of network ACLs that can be created in a region | 50 | |
Maximum number of IP addresses that can be added to a network ACL | 300 | |
Maximum number of IP addresses that can be added to a network ACL by making an API call | 50 | |
Maximum number of listeners that can be associated with a network ACL | 50 | |
Public key algorithms supported by CLB |
| N/A |
Bandwidth limits
The peak bandwidth of a CLB instance varies based on the metering method of Internet data transfer that you selected for the CLB instance.
Pay-by-data-transfer | Pay-by-bandwidth |
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For each Alibaba Cloud account, the sum of the peak bandwidth of all Internet-facing CLB instances that use the pay-by-data-transfer metering method in a region cannot exceed 5 Gbit/s. If your business requires guaranteed bandwidth or larger bandwidth, you can purchase pay-by-bandwidth CLB instances. | For each Alibaba Cloud account, the sum of the peak bandwidth of all Internet-facing CLB instances that use the pay-by-bandwidth metering method in a region cannot exceed 50 Gbit/s. You can contact the customer business manager to increase the quota. |