- Release Notes and Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- CLB Instance
- CLB Listener
- CLB Listener Overview
- Configuring a TCP Listener
- Configuring a UDP Listener
- Configuring a TCP SSL Listener
- Configuring an HTTP Listener
- Configuring an HTTPS Listener
- Load Balancing Methods
- Session Persistence
- Configuring Layer-7 Redirection
- Layer-7 Custom Configuration
- Layer-7 Domain Name Forwarding and URL Rules
- Using QUIC Protocol on CLB
- SNI Support for Binding Multiple Certificates to a CLB Instance
- Real Server
- Health Check
- Certificate Management
- Monitoring and Alarm
- Log Management
- Cloud Access Management
- Classic CLB
- Best Practices
- OPS Guidelines
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- Listener APIs
- Real Server APIs
- Target Group APIs
- Redirection APIs
- Other APIs
- Queries CLB instances with high traffic under the current account
- DescribeTaskStatus
- Gets the CLB exclusive logset
- CreateClsLogSet
- CreateTopic
- CreateLoadBalancerSnatIps
- DeleteLoadBalancerSnatIps
- SetLoadBalancerSecurityGroups
- SetSecurityGroupForLoadbalancers
- ReplaceCertForLoadBalancers
- DescribeLoadBalancerListByCertId
- SetLoadBalancerClsLog
- DescribeQuota
- Cloud Load Balancer APIs
- Classic CLB APIs
- Data Types
- Error Codes
- CLB API 2017
- FAQs
- Service Level Agreement
- Contact Us
- Glossary
- Release Notes and Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- CLB Instance
- CLB Listener
- CLB Listener Overview
- Configuring a TCP Listener
- Configuring a UDP Listener
- Configuring a TCP SSL Listener
- Configuring an HTTP Listener
- Configuring an HTTPS Listener
- Load Balancing Methods
- Session Persistence
- Configuring Layer-7 Redirection
- Layer-7 Custom Configuration
- Layer-7 Domain Name Forwarding and URL Rules
- Using QUIC Protocol on CLB
- SNI Support for Binding Multiple Certificates to a CLB Instance
- Real Server
- Health Check
- Certificate Management
- Monitoring and Alarm
- Log Management
- Cloud Access Management
- Classic CLB
- Best Practices
- OPS Guidelines
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- Listener APIs
- Real Server APIs
- Target Group APIs
- Redirection APIs
- Other APIs
- Queries CLB instances with high traffic under the current account
- DescribeTaskStatus
- Gets the CLB exclusive logset
- CreateClsLogSet
- CreateTopic
- CreateLoadBalancerSnatIps
- DeleteLoadBalancerSnatIps
- SetLoadBalancerSecurityGroups
- SetSecurityGroupForLoadbalancers
- ReplaceCertForLoadBalancers
- DescribeLoadBalancerListByCertId
- SetLoadBalancerClsLog
- DescribeQuota
- Cloud Load Balancer APIs
- Classic CLB APIs
- Data Types
- Error Codes
- CLB API 2017
- FAQs
- Service Level Agreement
- Contact Us
- Glossary
CLB offers two types of instances: CLB (formerly "application CLB") and Classic CLB.
- CLB supports TCP/UDP/HTTP/HTTPS protocols to provide flexible forwarding capabilities based on domain names and URL paths.
- Classic CLB does not support HTTP/HTTPS protocols on the private network but is easy to configure.
CLB has all features of Classic CLB. Given their product features and performance, we recommend that you use CLB. For a detailed comparison, please see below:
| Product Type | CLB | Classic CLB | ||
|---|---|---|---|---|
| Public network | Private network | Public network | Private network | |
| Layer-7 forwarding (HTTP/HTTPS) | ✓ | ✓ | ✓ | × |
| Layer-4 forwarding (TCP/UDP) | ✓ | ✓ | ✓ | ✓ |
| Encrypted Layer-4 forwarding (TCP SSL) | ✓ | ✓ | × | × |
| HTTP/2 and WebSocket (Secure) support | ✓ | ✓ | ✓ | × |
| Load balancing policy | IP hash (Layer-7) Weighted round-robin Weighted least-connection scheduling |
IP hash (Layer-7) Weighted round-robin Weighted least-connection scheduling |
IP hash (Layer-7) Weighted round-robin Weighted least-connection scheduling |
Weighted round-robin |
| Session persistence | ✓ | ✓ | ✓ | ✓ |
| Health check | ✓ | ✓ | ✓ | ✓ |
| Custom forwarding rule (domain name/URL) | ✓ | ✓ | × | × |
| SNI multi-certificate support | ✓ | ✓ | × | × |
| Forwarding to different real ports | ✓ | ✓ | × | × |
| Custom Layer-7 configuration | ✓ | ✓ | × | × |
| Layer-7 redirect (rewrite) | ✓ | ✓ | × | × |
| Cross-region binding support | ✓ | ✓ | × | × |
| Storing Layer-7 access logs in CLS | ✓ | ✓ | ✓ | × |
Note：
- CLB instance: a CLB instance supports enabling or disabling the HTTP/2 protocol. For more information, see Configuring an HTTPS Listener .
- Classic CLB instance: HTTPS listeners created for Classic CLB before April 2018 do not support the HTTP/2 protocol. HTTPS listeners created after April 2018 support but cannot disable the HTTP/2 protocol.
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