I do see something that may or may not mean something.
Mar 12 21:49:51.967: HSRP: Fa0/0 Redirect adv out, Passive, active 0 passive 1
What is being redirected? Do you have the no ip redirect command under each Fa0/0 interface? Im not saying that that is causing these state changes ot be registered, but you should have it configured as a matter of practice.
What about the state of the L2 trunk in between switches? Any errors? Any bouncing?
Why dont you clear the log and clear the counters and lets keep an eye on it?
You can also post the config so we can take a look at it right quick.
ICMP is a network layer protocol that provides message packets to report errors and other information relevant to IP processing. ICMP provides diagnostic functions and can send and redirect error packets to hosts.
When running HSRP, its important to prevent hosts from discovering the interface (or real) MAC addresses of routers in the HSRP group. If a host is redirected by ICMP to the real MAC address of a router, and that router later fails, then packets from the host will be lost.
ICMP redirects are used by a router to redirect traffic to an alternate default gateway when the primary fails. But that is what HSRP and the virtual IP address is for, so the ip redirect function should be disabled, lest it interfere with normal HSRP operation.
With later versions of IOS, and depending on your switch/router model, HSRP CAN work together with ICMP redirects. HSRP will allow the diagnostic functions of ICMP fredirects but NOT the messages that actually advertise a different default gateway address. Those, HSRP will filter out.
HSRP w/ICMP redirects are supported in:
â¢Cisco Catalyst 5000 family switches with an installed Route Switch Module
â¢Cisco 1700 series
â¢Cisco 2600 series
â¢Cisco 4700 family routers
â¢Cisco 7100 series
â¢Cisco 7200 series
â¢Cisco 7500 series
â¢Cisco 12000 series
Again, Im not syaing that that is causing the problem, but you should address this issue.
Lastly, you have still not told me whether your L2 inter-switch trunk is bouncing or running errors.
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