Configure multiple ISP on different VLAN ISP -1 Default VLAN / ISP -2 Default VLAN And Need VLAN Create 2525 For ISP 2 And Port Untag Mode And All 4 Pon Port Tag To 2525 VLAN Video Guide BSNL Configuartion GPON OLTMGNT VLAN - 110Customar VLAN - 128-500Voice VLAN - 1830,1831,1849MGNT - 10.215.173.58Subnet Mask - 255.255.255.0Gateway - 10.215.173.1 OLT Cascading,Connect two Mini OLT Video Guide