If static NAT is configured with the same IP on each router, the routers advertise each other with the MAC addresses, and the routers display the %IP-4-DUPADDR: Duplicate address [ip address] on [interface], sourced by [mac-address] error message. Refer to NAT-Static Mapping Support with HSRP for High Availability for more information.
No NAT is configured, no loop in STP l2 domain, no duplicate IP. Is it possible, if we have same vlan IP on any other L3 domain in our datacenter & we are getting the alert. I mean, Can HSRP cross L3 boundary ?
Double check the HSRP configuration on both your switches once again. Often a small but significant issue is overlooked:
The "standby" command accepts a group number as the next parameter, for example,
standby 1 ip 10.32.137.2
Here, the standby group number will be 1. However, the group number may be omitted, resulting in a command
standby ip 10.32.137.2
In this case, the group number is 0.
Now, if two routers are configured for HSRP, one having the group number specified and the other not, actually two distinct standby groups are created inadvertently that indeed collide in their IP address. The solution here is simple: to make sure that the group number is the same, preferably by having it specified explicitly on all routers.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.