Hi Parthiban, please see my network diagram and configuration below below. --------------------------------------------------------------------------------------------------- Data Center Core Switch: enable ipforwarding configure iproute add 172.30.1.0/24 172.20.1.246 configure iproute add 172.30.1.0/24 172.21.1.246 enable iproute sharing vr vr-default enable loopback-mode vlan vlanserver --------------------------------------------------------------------------------------------------- Branch Core Switch: enable ipforwarding configure iproute add 172.25.1.0/24 172.20.1.1 configure iproute add 172.25.1.0/24 172.21.1.1 enable iproute sharing vr vr-default enable loopback-mode vlan vlanlan ---------------------------------------------------------------------------------------------------- i can ping the 172.25.1.1 from 172.30.1.1 if VLAN100 is up. However i cannot ping the 172.25.1.1 from 172.30.1.1 once i disconnect the VLAN100 connection in branch core switch. also, we check the iproute sharing using "show ipconfig" to confirm if enable. thanks, Marlon