Optional) Configuring Server Health Detection - Huawei S9700 Series Configuration Manual

S9700 Core Routing Switch
Configuration Guide - SPU
Context
The NAT address pool takes effect only when it is bound to a Layer 3 classifier or a load balancing
member instance.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
nat address-group group-index start-address end-address
An NAT address pool is configured.
Up to 1024 NAT address pools can be configured.
By default, no NAT address pool is configured.
The IP address of the outbound interface must be different from any IP address in the NAT
address pool that is bound to the Layer 3 classifier referenced by the load balancing policy on
the outbound interface.
l If the IP address of the outbound interface is the same as an IP address in the NAT address
l After the Layer 3 classifier or the load balancing instance is bound to the NAT address pool,
----End

6.4.3 (Optional) Configuring Server Health Detection

In server load balancing, the SPU needs to detect the health status of each server. Therefore, the
SPU can determine whether to select a server for making load balancing decisions.
Context
When a server group is bound to only a probe, the health status of a server member is detected
according to the following principles:
l
l
Issue 01 (2012-03-15)
pool, the Layer 3 classifier or the load balancing instance cannot be bound to the NAT address
pool.
if the IP address that is to be assigned to the outbound interface is the same as an IP address
in the NAT address pool, the system displays the information that the IP address cannot be
set.
If the server member is in Down state, the probe sends probing packets at intervals specified
by fail-interval interval.
– If the probe receives response packets of the ISP gateway for the consecutive number
of times specified by fail-retrycount times in the timeout interval, it marks the server
member in Up state.
– Otherwise, the server member retains to be in Down state.
If the server member is in Up state, the probe sends probing packets at intervals specified
by interval interval.
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