Flapping

[Danilo Dy]

I have redundant NOKIA Firewall connected to port 2 of two switch with port 12 as trunk. I receive this error:

RTD-1-ADDR_FLAP [chars] relearning [dec] addrs per min

Cisco explanation and solution http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a008007e927.html

When i do the recommendation "debug" the VRRP MAC Address of NOKIA is move from port 2 to 12 and vice versa. Both for two switch. I can't just remove the port like what the recommendation says. Is it saying to use another port as TRUNK or remove the connection between two switch?

[vkapoor5]

According to error message, it is saying about SINGLE looped-back port not about ports. So, please identify the port with the command "debug ethernet-controller addr" and remove the port. Because anyway that port is looped-back which is useless, what it transmits received by itself only.

[7rbowenii]

medan,

HSRP uses multicast address 224.0.0.2. Make sure your firewalls are not blocking this address. I have run into a similar problem before...

-Bo

[Danilo Dy]

Nope, Nope, Nope. I post these poroblem also in WAN, Routing and Switching. Title "C3512XL ADDR_FLAP messages" see my findings there. BTW, I did everything including shutting down ports connected to firewalls, moving servers in other ports, moving firewalls in other ports. shutting down firewalls, rebooting switches, rebooting firewalls. When we deploy this 2 years ago and test all possible breakdown sccenario (sshutdown switch, fw, or server) theres no problem, therefore it is not a design problem.

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.1dd5dbf2

I guess Cisco should include this as one of the solution. Replace the switch, because it's not a loop. The switch is faulty.