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тАО07-05-2009 10:50 PM
тАО07-05-2009 10:50 PM
VRRP Log Entry
Got a bit of a funny one. I have VVRP setup between 2x 5406zl switches. CORE-A is the Master and CORE-B is the Backup. 3x Vlans have Virtual routers configured. the servers etc are VID2. This is the network having the issue. every 35 minutes or so, a log entry appears in CORE-A's log stating the following:
W 07/06/09 16:12:11 00793 vrrp: Vrid 2 ,Vid 2 IP addr is duplicated on n/w(4)
W 07/06/09 16:02:10 00793 vrrp: Vrid 2 ,Vid 2 IP addr is duplicated on n/w(1)
this started happening after we had an extended power outage over the weekend. I dont know whether this is coincidence or what, but to me it seems like somthing else on the network has the same address as the gateway. Also, I have checked the VRRP logs on the backup router and it hasnt tried to take over as master.
this lasts for about 2-5 mintues then all back to normal. any ideas?
Trev.
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тАО07-07-2009 12:28 AM
тАО07-07-2009 12:28 AM
Re: VRRP Log Entry
what's connected to n/w(1) and n/w(4) ?
what are the details op the ip and vrrp config?
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тАО07-07-2009 01:12 AM
тАО07-07-2009 01:12 AM
Re: VRRP Log Entry
also, should have mentioned this happens every 1hr to the second and lasts for 17 minutes exactly. also, failover happens but the backup router doesnt adopt the master (owner) IP.
I will upload the configs, just need to modify some details.
Trev.
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тАО07-07-2009 01:19 AM
тАО07-07-2009 01:19 AM
Re: VRRP Log Entry
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тАО07-08-2009 12:23 AM
тАО07-08-2009 12:23 AM
Re: VRRP Log Entry
what's the backup-swithches config?
when using MSTP, all switches in your network must use the same mstp config.
- check all switches
- check for rogue switches (not configured by IT department) by looking at the mac-adress-table of ports.
- you may temporarily disable vrrp on the backup router(s) and check if messages keep coming
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тАО07-08-2009 04:19 AM
тАО07-08-2009 04:19 AM
Re: VRRP Log Entry
Cheers.
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тАО07-13-2009 02:10 AM
тАО07-13-2009 02:10 AM
Re: VRRP Log Entry
Thanks for the replies. Solved the issue. the log entry actually means that there is a duplicated IP address on the network. Someone with linux skills but network skills thought they needed to add a secondary IP address to a second nic on the Redhat server that would only get access when a cron job ran every 1hr and ran for 15 minutes. the ARP tables throughout the network took about 5 to refresh.
What a pain to locate!
Trev.
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тАО07-13-2009 02:10 AM
тАО07-13-2009 02:10 AM