1  We develop a new funciton called multicast serial , Now olt connect to the other olt 
   mullticast  can work in both of this two OLT

2  We develop a function called PPPOE IA , the cmd :
   Switch_config#pppoe intermediate-agent

3   We improve  the ip source binding mib, now we can bining the vlan 
    in ip source binding while using snmp .The OID is :    
    
    1.3.6.1.4.1.3320.2.233.3.1.1
