Allied Telesis 86251-08 manual Down device unreachable

Patch 86251-08 For Rapier Series Switches SHOW IP ADVERTISE 59

To create a polling instance, use the command:

ADD PING POLL=poll-idIPADDRESS={ipaddipv6add[%interface]} [CRITICALINTERVAL=1..65535] [DESCRIPTION=poll-description] [FAILCOUNT=1..100] [LENGTH=4..1500] [NORMALINTERVAL=1..65535] [SAMPLESIZE=1..100] [SIPADDRESS={ipaddipv6add}] [TIMEOUT=1..30] [UPCOUNT=1..100]

•where poll-idis a number from 1 to 100, and identifies the polling instance in the trigger commands and in other PING POLL commands. The router or switch can poll up to 100 IP addresses at once.

The NORMALINTERVAL parameter specifies the time period between pings when the device is reachable. By default, this is set to 30 seconds. The CRITICALINTERVAL parameter specifies the time period between pings when the router or switch has not received a reply to at least one ping and when the device is unreachable. The default is 1 second. The CRITICALINTERVAL enables the router or switch to quickly observe changes in the state of the device, and should be set to a much lower value than the

NORMALINTERVAL.

The number of pings that the router or switch will examine to consider a change in state is controlled by three parameters: FAILCOUNT, SAMPLESIZE, and UPCOUNT. The FAILCOUNT is the number of pings that must be unanswered for the router or switch to consider the device unreachable. The default is 5. The SAMPLESIZE is the total number of pings within which the FAILCOUNT number of pings must be unanswered. If SAMPLESIZE and FAILCOUNT are the same, the unanswered pings must be consecutive. If SAMPLESIZE is greater than FAILCOUNT, a device that does not always reply to pings may be declared unreachable. By default, SAMPLESIZE is equal to FAILCOUNT. The UPCOUNT is the number of consecutive pings that must be answered for the router or switch to consider the device reachable again. The default is 30. The interaction between these parameters is shown in Figure 3.

Figure 3: The interaction between states and parameters for ping polling.

UP: device reachable

Substates of UP:

Up:No failed pings in SAMPLESIZE window. Poll frequency of NORMALINTERVAL.

Critical Up:	At least 1 failed ping in SAMPLESIZE window.
	Poll frequency of CRITICALINTERVAL.

after UPCOUNT consecutive ping replies

LINKUP trigger activated

after FAILCOUNT failed pings in SAMPLESIZE window

LINKDOWN trigger activated

DOWN: device unreachable	Substates of DOWN:
	Down:	Last ping failed
		Poll frequency of CRITICALINTERVAL.

Critical Down: Last ping succeeded

Poll frequency of CRITICALINTERVAL.

ping-trigger2

Patch 86251-08 for Software Release 2.5.1 C613-10356-00 REV I