Thanks for the reply.
I hope you understand the whole scenario, please let me know if there is any doubts.
The client PCs are getting IP configuration from form the DHCP servers of their respective networks with correct net mask i.e. 255.255.248.0 (/21). Checked the client PCs and DHCP servers configurations.
I can use the dynamic routing, but problem is that one Gateway is linux machine as firewall and other is Cyberoam, I have only one CISCO device connecting these networks.
I have also tried the router ports method using the 'no switchport' on L3 switch instead of vlans but the issue is same.
... View more