H3C Technologies H3C SecPath F1000-E - Manual (Page 889)

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Inbound link load balancing
Inbound link load balancing resolves a domain name according to inbound link load balancing DNS
entries. An inbound link load balancing DNS entry is composed of four parts: domain name, IP
addresses, physical links and ACLs. Their relationship is as shown in the following figure:
Figure 25 Relationship between the components of an inbound link load balancing DNS entry
The work flow of implementation of inbound link load balancing of an LB device is as follows:
1. Upon receiving a DNS request sent by the local DNS server, the LB device searches the matched
inbound link load balancing DNS entry; if the source IP address of the DNS request matches the
ACL corresponding to the DNS entry, the LB device responds with the IP address of the DNS entry;
otherwise, it goes to the following step.
2. The LB device performs best performing link detection on all the physical links corresponding to the
DNS entries that match the domain name according to the source IP address of the DNS request,
selects a best physical link, and responds with the IP address of the corresponding DNS entry.
Configuration Task List
Configuring outbound link load balancing
Perform the tasks in Table 7 to configure outbound link load balancing.
Table 7 Outbound link load balancing configuration task list
Task Remarks
Configuring Global Parameters
Optional
Allows you to enable the saving of the last hop information and
unidirectional traffic detection.
By default, the saving of the last hop information function and the
unidirectional traffic detection function are disabled.
Creating a Physical Link
Required
Allows you to create a physical link (a link where packets are
forwarded), and configure the physical link parameters.
By default, no physical link exists in the system.