[j-nsp] which situation we need Interconnecting two Layer 2 VPN

[bruno]

hello , 


i am new to l2vpn, when i read the l2vpn doc ,i am confuse. why we need interconnecting two layer vpn. is it for connecting two sp l2vpn customer or same service provider customer.  


take this doc for example ,why we need it .  why not connect PE1 and PE5 .then the CE1 and CE5 can communicate?


http://www.juniper.net/techpubs/en_US/junos11.4/topics/example/layer-2-vpn-layer-2-vpn-connection-configuring.html 






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Best Regards,
Bruno