关于NAT中的NVI0 端口是什么东西？

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外文的解释是这样的，小弟不才第一句中的domain-less就不懂是什么意思了
The NVI is only used when using "domain-less" NAT.  It is normal to have the NVI shutdown when not using NVI. NVI allows traffic between overlapped VPN routing/forwarding (VRFs) in the same Provider Edge (PE) router, and traffic from inside to inside between overlapping networks.

check out the attached document regarding NVI hope that clear out your query !!

NVI0作用是什么呢？  顺带帮小弟解释下domain-less怎么翻译，谢谢啦

                               
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