NEC IP8800/S6600, IP8800/S3600, IP8800/S2400, IP8800/S6700, IP8800/S6300 manual 108

3.Troubleshooting Functional Failures in Operation

No.	Troubleshooting Steps and Command		Action
5	Execute the show vrrpstatus command	• If "Virtual router <VRID> of <Interface Name> received VRRP packet for
	with "statistics" parameter specified to check		which the advertisement interval is different than the one configured for local
	the receiving status of ADVERTISEMENT		virtual router." is registered in the type log and "<Number of packets> with bad
	packets.		advertisement interval" of statistics is incremented, confirm that set values of
			the ADVERTISEMENT packet sending interval and the settings of the VRRP
			operation mode between this system and the remote system are same.
		• If "Virtual router <VRID> of <Interface Name> received VRRP packet that
			does not pass the authentication check." is registered in the type log and
			"<Number of packets> with authentication failed" of statistics is incremented,
			confirm that password settings match between this system and the remote
			system.
		• If "Virtual router <VRID> of <Interface Name> received VRRP packet with IP
			HopLimit not equal to 255." is registered in the type log and "<Number of
			packets> with bad ipv6 hoplimit" of statistics is incremented, confirm that there
			is no other router between this system and the remote system.
		• If "Virtual router <VRID> of <Interface Name> received VRRP packet for
			which the address list does not match the locally configured list for the virtual
			router." is registered in the type log and "<Number of packets> with bad ipv6
			address list" of statistics in incremented, confirm that the settings of the virtual
			IP address and VRRP operation mode are same.
		• If "Virtual router <VRID> of <Interface Name> received VRRP packet that
			does not pass the authentication check." is registered in the type log and
			"<Number of packets> with bad authentication type" of statistics is
			incremented, check to see if the authentication password has been set on this
			system and the remote system.
		• If "Virtual router <VRID> of <Interface Name> received VRRP packet that
			length less than the length of the VRRP header." is registered in the type log and
			"<Number of packets> with packet length error" of statistics is incremented,
			confirm that settings of the VRRP operation mode between this system and the
			remote system are same.
		• When "VRRP packet received with unsupported version number." is registered
			in the type log and "<Number of packets> with invalid type" of statics is
			incremented, confirm that settings of the VRRP operation mode between this
			system and the remote system are same.
		If the ADVERTISEMENT packet is normally received, check the remote system.
		Go to No. 6 if the ADVERTISEMENT packet is not received.
6	Check the statistical information of the	If "Input rate" and "Output rate" are excessive on the physical port to which the
	physical port to which the remote system	remote system is connected and the line traffic is high or the CPU usage checked
	constituting the same virtual router is	by the show cpu command is high, take the following actions:
	connected using the show interfaces	• If the line loops, review the use of STP or physical network configuration to
	command.		eliminate the loop.
	Also, check the CPU usage using the show	•	Execute configuration command vrrp timers advertise to set up
	cpu command.		rather long sending intervals for sending the ADVERTISEMENT packets.
		•	Execute configuration command vrrp preempt delay to set the automatic
			switch back suppressing time.
		Go to No. 7 if the traffic of the physical port is low.
7	Confirm that discarding ADVERTISEMENT	If such filtering setting exists, change the filtering setting so that the
	packets is not set in the filter setting.	ADVERTISEMENT packets are not discarded.
		If this is not the case, check for the operation of the remote system constituting the
		same virtual router.
8	If a failure monitoring interface has been set	If another virtual router is defined on the interface on which a failure monitoring
	up, check for its status.	interface is set up, confirm that the failure monitoring interface of that virtual
		router is not the interface of this virtual router. Otherwise, delete the setting of
		either failure interface.
		Go to No. 9 if the failure monitoring interface described above is not set up.

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