Performance-related questions

What is the maximum count of BLB instances a user can create? What are the specifications and quota limit when using BLB products?

Currently, a user can create up to 60 BLB instances. To request more, please apply via Quota Management.

For BLB product quota limit, please refer to Document To request more, please submit a ticket.

Does BLB impose bandwidth restrictions?

BLB instances inherently have no bandwidth limits. However, you must bind an EIP for public network access. EIP bandwidth ranges: standard EIPs up to 200 Mbps, and enhance BGP EIPs up to 5,000 Mbps. Undertand the Elastic IP (EIP)。

What forwarding rules does the BLB support?

• Layer 4 (TCP/UDP protocol) listeners support three forwarding rules, including weighted round-robin, least connections, and source IP;
• Layer 7 (HTTP/HTTPS protocol) listeners support two forwarding rules: weighted round-robin and least connections.

What monitor information does BLB currently provide?

• Layer 4 provides listener-level metrics such as ingress traffic, egress traffic, instance count, network traffic, packets, and active connections.
• Layer 7 provides listener-level metrics such as ingress traffic, egress traffic, instance count, network traffic, packets, active connections, and requests.

How is health check implemented?

BLB automatically shields faulty nodes through health checks, to achieve high service availability. The BLB health checks are divided into two types: TCP protocol health checks and HTTP protocol monitor checks.

• TCP protocol health checks are performed by sending TCP SYN packets;
• HTTP protocol health checks are performed by sending HTTP GET requests.

Does BLB support session persistence function?

Layer 4 (TCP/UDP protocol) listeners enable session persistence using source IP forwarding rules, while Layer 7 (HTTP/HTTPS protocol) achieves it by inserting or rewriting cookies.

Does real BCC require extranet bandwidth? Is this related to BLB's service capabilities?

A BCC connected only via BLB can function without requiring public network bandwidth.

Does BLB have DDOS protection capabilities?

When DDOS attacks exceed 5G, the EIP will be blackholed by the network operator, making it can’t be bound and assessed. The server itself remains functional, only the public EIP on BLB is blackholed. For DDOS protection, we recommend you using advanced defense IP. Detailed Reference

Does the load balancer support Jumbo frames forwarding?

Jumbo frames are Ethernet frames with payloads exceeding the IEEE 802.3 standard limit of 1,500 bytes. This increased payload helps enhance link utilization and improve network performance. BLB load balancers currently do not support jumbo frames or multipart forwarding.