I can't access other networks from vlan10 & vlan 20 but I can access vlan10,vlan 20 from other networks(OSPF routing protocol is used in my all routers).I can ping vlan10&20 from my BRANCH A router but not ping between the Vlan's (10&20).For your ref...

PFA for your reference in SWinterface FastEthernet0/1switchport trunk allowed vlan 1,10,20switchport mode trunk!interface FastEthernet0/2switchport access vlan 10switchport mode trunk!interface FastEthernet0/3switchport access vlan 20switchport mode ...