High Performance ComputingHigh Performance Computing

Elastic Cloud Server
Bare Metal Server
Auto Scaling
Image Management Service
Dedicated Host
Virtual Private Cloud
Elastic IP
Elastic Load Balance
NAT Gateway
Direct Connect
Virtual Private Network
Domain Name Service
VPC Endpoint
Cloud Connect
Enterprise Switch
Security & Compliance
Web Application Firewall
Host Security Service
Data Encryption Workshop
Database Security Service
Advanced Anti-DDoS
Data Security Center
Container Guard Service
Situation Awareness
Managed Threat Detection
Cloud Certificate Manager
Anti-DDoS Service
Relational Database Service
Document Database Service
Data Admin Service
Data Replication Service
GaussDB(for MySQL)
Distributed Database Middleware
GaussDB(for openGauss)
Developer Services
Distributed Cache Service
Simple Message Notification
Application Performance Management
Application Operations Management
API Gateway
Cloud Performance Test Service
Distributed Message Service for Kafka
Distributed Message Service for RabbitMQ
Distributed Message Service for RocketMQ
Cloud Service Engine
Cloud Communications
Message & SMS
Cloud Ecosystem
Partner Center
User Support
My Account
Billing Center
Cost Center
Resource Center
Enterprise Management
Service Tickets
HUAWEI CLOUD (International) FAQs
ICP License Service
Support Plans
Customer Operation Capabilities
Partner Support Plans
Professional Services
Intelligent EdgeFabric
SDK Developer Guide
API Request Signing Guide
Koo Command Line Interface
Updated at: Feb 10, 2022 GMT+08:00

IPoIB Functions


Internet Protocol over InfiniBand (IPoIB) allows connection and data transmission through physical IB networks (IB card, cable, and switch on the server) over the IP protocol.

It provides a RDMA-based IP network simulation layer and allows you to run applications on the InfiniBand network without making any modification. However, IPoIB is inferior to RDMA in performance. Most applications use RDMA that provides high bandwidth and low latency, and some key applications use IPoIB.

Applications can run on the InfiniBand network over the IP protocol without any modification required.

Communication Modes

Two modes datagram and connected can be configured for IPoIB devices. The former provides unreliable and connectionless links, and the latter provides reliable links with connections.

  • In the datagram mode, the queue pair does not allow the packet size to exceed the MTU value of the IB link layer. The IPoIB header contains four bytes, and the IPoIB MTU value is less than that of the IB link layer.
  • In the connected mode, the queue pair allows packets larger than those of the IB link layer. In theory, the packet can contain a maximum of 65535 bytes. The connected mode has better performance, but consumes more memory. Most systems give higher priority to performance, and the connected mode is configured for the IB network port.
The NIC driver of the current version does not support the connected mode.

Due to NIC driver performance issues, the connected mode is disabled. Therefore, the NIC driver in the HPC solution does not support the connected mode.

IP Address Assignment Methods

Two methods are available, dynamic configuration and DHCP.

  • Dynamic configuration

    IPoIB devices have a hardware address containing 20 bytes. The first four bytes is the queue pair number, the middle eight bytes is the subnet prefix, and the last eight bytes is the GUID.

    You can query the hardware address of an IPoIB device only by running the ip command. If you run the ifconfig command, you cannot obtain a complete address. The following figure shows an example of a static IP address.

    Figure 1 Static IP address
  • DHCP

    A standard DHCP frame contains fields, such as hardware type (htype), MAC address length (hlen), and MAC address (chaddr). The MAC address is not long enough to contain the IPoIB hardware address. Therefore, field client-identifier is defined to identify DHCP sessions on the client. The client-identifier field is used to associate the IP address with the client. DHCP Server uses the field to distinguish IP addresses assigned to different clients.

    The HPC solution uses the DHCP method to ensure that IP addresses are automatically assigned and configured.


  • One IB NIC can be managed.
  • Similar to constraints of the InfiniBand NICs of BMSs, H2, HL1, and HI3 ECSs, ECSs using IPoIB cannot be migrated.
  • Similar to constraints of the InfiniBand NICs of H2, HL1, and HI3 ECSs, InfiniBand networks do not support security groups, QoS, and layer-3 and higher-layer network functions.
  • ECSs using IPoIB do not support ARP anti-spoofing and DHCP anti-spoofing due to NIC driver limitations.

Did you find this page helpful?

Failed to submit the feedback. Please try again later.

Which of the following issues have you encountered?

Please complete at least one feedback item.

Content most length 200 character

Content is empty.

OK Cancel