- Release Notes and Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- CLB Instance
- CLB Listener
- CLB Listener Overview
- Configuring TCP Listener
- Configuring UDP Listener
- Configuring TCP SSL Listener
- Configuring QUIC Listener
- Configuring HTTP Listener
- Configuring HTTPS Listener
- Load Balancing Methods
- Session Persistence
- Layer-7 Redirection Configuration
- 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
- Enabling Gzip Configuration & Testing
- HTTPS Forwarding Configurations
- Obtaining Real Client IPs
- Notes on SNAT and Non-SNAT Types for Private Network CLB
- Implementing HA Across Multiple AZs
- Load Balancing Algorithm Selection and Weight Configuration Examples
- Configuring WAF protection for CLB listening domain names
- Troubleshooting
- 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
- 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 TCP Listener
- Configuring UDP Listener
- Configuring TCP SSL Listener
- Configuring QUIC Listener
- Configuring HTTP Listener
- Configuring HTTPS Listener
- Load Balancing Methods
- Session Persistence
- Layer-7 Redirection Configuration
- 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
- Enabling Gzip Configuration & Testing
- HTTPS Forwarding Configurations
- Obtaining Real Client IPs
- Notes on SNAT and Non-SNAT Types for Private Network CLB
- Implementing HA Across Multiple AZs
- Load Balancing Algorithm Selection and Weight Configuration Examples
- Configuring WAF protection for CLB listening domain names
- Troubleshooting
- 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
- 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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