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Cisco Employee

%HSRP-4-DIFFVIP1

Hi Hemakumar,

I can see that Milan has laready provided you the links related to HSRP

I can explain you how leakage can happen if you have mis-configured the VLAN

Think you have mis-configured the access VLANs as below and with below connections

Switch1----(Vlan 12)--------------(Vlan 181)Switch2

Switch1----(Vlan181)--------------(Vlan 12) Switch2

Switch1------trunk--------------Switch2

HSRP traffic originating from Switch1 Vlan 12, reaches Switch2. But when it reaches switch2  it thinks that it  is coming from VLAN 181 becasue you have mis-configured the VLAN as VLAN 181. now this traffic will go back to Switch1 via trunk as VLAN 181 and will reach the HSRP router configured on VLAN 181

Now the traffic from HSRP route on Vlan 12 is leaked to HSRP router on Vlan 181

The same way trafficfrom Vlan 181 can leak to Vlan 12

Thanks

Raju

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