#pc1 192.168.100.2/24  gw  192.168.100.1 /24 , interface    ge-0/0/18.0  vlan-id 100     
#pc2 192.168.101.2/24  gw  192.168.101.1 /24 , interface    ge-0/0/16.0  vlan-id 101 
               
# 不同VLAN 通信，pc1->pc2  , pc2->pc1 

# 1）定义二层接口interfaces ->ge-0/0/x  unit 0 family ethernet-switching{ port-mode access;}

# 2）定义三层接口interfaces ->vlan->unit xxx-> family inet{ 如:address 192.168.101.1/24;}                 
           {
# 3）定义Vlans，关联二层接口和三层接口,如vlan100 ，vlan101

test@ex4200# show 
## Last changed: 2013-09-13 07:59:49 UTC
version 12.3R4.6;
system {
    host-name ex4200;
......                             
} 
# 1）定义二层接口interfaces                                 
interfaces {                            
    ......               
    ge-0/0/16 {                         
        unit 0 {                        
            family ethernet-switching { 
                port-mode access;       
            }                           
        }                               
    }                                   
    ......                                  
    ge-0/0/18 {                         
        unit 0 {                        
            family ethernet-switching { 
                port-mode access;       
            }                           
        }                               
    }
    ......                                  
                                 
    #定义管理接口ip地址
    me0 {                               
        unit 0 {                        
            family inet {               
                address 192.168.1.1/24; 
            }                           
        }                               
    } 
    
    #2）定义三层接口,如：l3-interface vlan.100 ,vlan.101                                
    vlan {                              
        unit 0 {                        
            family inet {               
                dhcp {                  
                    vendor-id Juniper-ex4200-24t;
                }                       
            }                           
        }                               
       unit 100 {                      
            description "VLAN 100";     
            family inet {               
                address 192.168.100.1/24;
            }                           
        }                               
        unit 101 {                      
            family inet {               
                address 192.168.101.1/24;
            }                           
        }                               
    }                                   
    vme {                               
        unit 0 {                        
            family inet {               
                dhcp {                  
                    vendor-id Juniper-ex4200-24t;
                }                       
            }                           
        }                               
    }                                   
}                                       

# 3）定义Vlans，关联二层接口和三层接口                                       
vlans {                                 
    default {                           
        l3-interface vlan.0;            
    }                                   
    ......
                              
    vlan100 {                           
        vlan-id 100;                    
        interface {                     
            ge-0/0/18.0;                
        }                               
        l3-interface vlan.100;          
    }                                   
    vlan101 {                           
        vlan-id 101;                    
        interface {                     
            ge-0/0/16.0;                
        }                               
        l3-interface vlan.101;          
    }                                   
    ......                             
}                                       
                                      
{master:0}[edit]
test@ex4200#