Symptom:
Even though there is no error in network devices, the following message is output and HUB monitoring ends abnormally.
hanet: ERROR: 87000: polling status changed: Primary polling failed. (eth0,target=192.13.71.20) hanet: ERROR: 87100: polling status changed: Secondary polling failed. (eth1,target=192.13.71.21) |
Corrective action:
In NIC switching mode, occasionally it takes time to establish a data link at Ethernet level following activation of an interface. Even though activated an interface, it is not possible to communicate immediately. Generally it becomes possible to communicate in dozens of seconds after activated, but some HUBs to connect take more than one minute, and occasionally HUB monitoring fails and switching occurs.
In such a case, extend the time to wait for linking up (default value: 60 seconds) by a hanetpoll on command. Also when HUB to use is set to use STP (Spanning Tree Protocol), occasionally takes long time to become possible to communicate. Extend the time to wait for linking up if necessary. On the HUB where STP is running, possible next connection could take twice as the transfer delay time(normally 30 sec) after linked up. Standard link up latency of operating STP can be derived from the equation below. For verifying STP transfer delay time, see the manual of HUB your using.
link up latency > STP transfer delay time * 2 + monitoring period * number of monitoring |
Note
To operate HUB monitoring over the system that runs firewall, configure the firewall so that ping can pass through the firewall. Otherwise, it fails to operate HUB monitoring.
