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

S9700 Core Routing Switch
Configuration Guide - SPU
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6.3.3 (Optional) Configuring Link Health Detection

In egress link load balancing, the SPU needs to detect the link status so that it can determine
whether to use the link when making load balancing decisions.
Context
In egress link load balancing, the SPU detects the link status through an ICMP probe. The ICMP
probe sends ICMP Echo request packets to the ISP gateway at the probing interval.
When a link group is bound to only one probe, the health status of a link member is detected
according to the following principles:
l
l
When a link group is bound to multiple probes, the health status of a link member is detected
according to the following principles:
l
l
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
load-balance ip interface interface-type interface-number
The IP address of a sub-interface is obtained and used as the source IP address of probing packets
of a probe.
The interface type can be XGE sub-interface, loopback interface, or Eth-Trunk sub-interface.
Issue 01 (2012-03-15)
in the NAT address pool, the system displays the information that the IP address cannot be
set.
If the link member is in Down state, the probe sends probing packets at an interval 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 link
member in Up state.
– Otherwise, the link member retains to be in Down state.
If the link member is in Up state, the probe sends probing packets at an interval specified
by interval interval.
– If the probe does not receive response packets of the ISP gateway for the consecutive
number of times specified by retry-count times in the timeout interval, it marks the link
member in Down state.
– Otherwise, the link member retains to be in Up state.
When the probe mode is fail-on-all, the link member is considered Down when all the
probes bound to the link group detect that the link member is in Down state.
When the probe mode is fail-on-one, the link member is considered Down when a probe
bound to the link group detects that the link member is in Down state.
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