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Use Limits

Last updated: 2022-01-19 17:14:49

    This document describes the use limits of CLB.

    General Restrictions

    The use of Tencent Cloud CLB has certain restrictions, and different types of CLB instances have their own use limits. For more information on CLB instance types, see Instance Types.

    Instance TypeResourceDefault Restriction
    General restrictions for all instances Number of public network CLB instances that can be created in a single region
    • 100 general IP-based instances
    • 3 static IP-based instances under one individual account or 15 under one organizational account.
    Number of private network instances that can be created under one account in a single region100
    Number of listeners that can be added to an instance50
    Ports that can be selected by a listener in an instanceAn integer between 1 and 65535
    CLB
    (formerly "application CLB")
    Number of domain name and URL forwarding rules that can be configured for an HTTP/HTTPS listener in a CLB instance50
    Number of servers that can be bound to a forwarding rule in a CLB instance100
    Number of backend ports that can correspond to a frontend port of a CLB instanceMultiple ports
    Classic CLB Number of servers that can be bound to a listener in a classic CLB instance100
    Number of backend ports that can correspond to a frontend port of a classic CLB instance1 port

    A CLB instance will not unbind itself from the CVM instance. After a CVM instance becomes isolated (pay-as-you-go CVM instance has been in arrears for more than 2 hours), it will not unbind itself from the CLB instance either.

    Peak Bandwidth

    The meaning of peak bandwidth varies by network billing modes as detailed below:

    Billing Mode Difference Description
    Billed by fixed bandwidth
    (including hourly bandwidth subscription and monthly bandwidth)
    This peak bandwidth is the committed bandwidth, and is guaranteed in case of bandwidth competition. The sum of peak bandwidth of all the running instances that are billed at a fixed bandwidth (including hourly-subscribed bandwidth and monthly-subscribed bandwidth) cannot exceed 50 Gbps in one region. If you require a higher bandwidth, contact your sales rep.
    Bill-by-traffic The peak bandwidth is only regarded as the maximum peak bandwidth, and not as the committed bandwidth. When bandwidth resources are contested, the peak bandwidth may be limited. The sum of peak bandwidth of all the running bill-by-traffic instances cannot exceed 5 Gbps in one region. If your application requires a guaranteed or higher bandwidth, choose bill-by-bandwidth.
    Bandwidth packages The sum of peak bandwidth of all the running instances that are billed by shared bandwidth package cannot exceed 50 Gbps in one region. If you require a higher bandwidth, contact your sales rep.
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