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    Limits

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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.