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FAQ--Specific network of different vpn communicate with each other by extended community attributes for the BGP route

Publication Date:  2012-07-27 Views:  45 Downloads:  0
Issue Description
Q:All service is separated by VPN in NGN carrier network of M Customer in I country. Customer has built IPCC network and want to implement that specific network range can communicate with the Callcenter which belong to old network. How to achieve that?
Alarm Information
None.
Handling Process
A: We can use extended community attributes for the BGP route to satisfy the requirement.
   There are three steps:
   1. Configure ip-prefix to filter specific network range;
    ip ip-prefix vpnb index 10 permit 4.4.4.4 32     //network range of vpnb                          
    ip ip-prefix vpna3 index 10 permit 3.3.3.3 32    //network range of vpna
    #
   2.Configure route policy, apply extended community attribute to add rt of other vpn for ip-prefix
     route-policy vpnb-policy permit node 10                                         
       if-match ip-prefix vpnb                                                        
       apply extcommunity rt 65535:3001  additive                                     
     #                                                                               
     route-policy vpna3-policy permit node 10                                        
       if-match ip-prefix vpna3                                                       
       apply extcommunity rt 65535:111  additive                                      
     # 
    
   3.Apply route policy under vpn instance
    ip vpn-instance vpna                                                            
      route-distinguisher 100:1                                                      
      export route-policy vpna3-policy                                               
      vpn-target 65535:3001 export-extcommunity                                      
      vpn-target 65535:3001 import-extcommunity                                      
    ip vpn-instance vpnb                                                            
      route-distinguisher 100:2                                                      
      export route-policy vpnb-policy                                                
      vpn-target 65535:111 export-extcommunity                                       
      vpn-target 65535:111 import-extcommunity                                       
#     
Test result: Please check attachment.
Root Cause
None.
Suggestions
BGP extended community attributes and route policy are very flexible.

END