CLB offers two types of instances: CLB (formerly "application CLB") and Classic CLB.
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 | ✓ | ✓ | ✓ | × |
| Storing Layer-7 access logs in COS | ✓ | × | ✓ | × |
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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