How much GRE tunnel can supported on Cisco routers

[Liu Jianxin-qch1927]

Hi, 

I have a question:

if i want to set up GRE tunnels between 30 sites, what kind of router should i use?

   site1 --------------Internet -----------------site2
                                |      .....
                            site3   ......

Thanks,

Jianxin

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