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Limits

Last Updated: Jun 27, 2022

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)

  • 80

  • 443

  • 2800~3300

  • 5000~10000

  • 13000~14000

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

  • RSA 1024

  • RSA 2048

  • RSA 4096

  • ECDSA P-256

  • ECDSA P-384

  • ECDSA P-521

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

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.