Configuring link load balancing, Configuration considerations, Outbound link load balancing – H3C Technologies H3C SecPath F1000-E User Manual
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Configuring Link Load Balancing
Configuration Considerations
Outbound link load balancing
The outbound link load balancing module comprises physical links, a logical link group, logical links
and a virtual service, as shown in
.
Figure 24 Relationship between the components of the outbound link load balancing module
Logical link group
Logical link 1
Logical link 2
Logical link n
……
Virtual service
Physical link 1
Physical link n
Physical link 2
•
Physical links: Entities that forward packets.
•
Logical link group: A group of logical links.
•
Logical links: Physical link-based logical entities to process services.
•
Virtual service: A logical entity that faces users. A virtual service can correspond to multiple logical
links.
The work flow of implementation of outbound link load balancing of an LB device is as follows:
1.
After a user sends a request to the destination segment specified by the virtual service of the LB
device, if a persistence method is specified in the virtual service, and matched persistence entries
exist, the request is distributed according to the persistence entries; otherwise, the following step
is performed. See
for the introduction to the persistence method.
2.
If ACL is enabled in the virtual service, the virtual service obtains the information of the
corresponding logical link group and matches the ACLs specified in the logical links one by one
based on the logical link weights from high to low. For the packets allowed by ACL, the virtual
service distributes the packets to the corresponding logical links; for the logical links that are
denied by ACL or no matched logical links are found, the following step is performed.
3.
88If best performing link is enabled in the virtual service, best performing link detection is
performed, and a best link is selected based on the matched best performing link entry; otherwise,
the following step is performed.
4.
The virtual service distributes the packets to a logical link (corresponding to a unique physical link)
according to the link scheduling algorithm configured in the logical link group.