In Juniper one needs a Tunnel PIC:
http://www.juniper.net/techpubs/hardware/m160/m160-picinstall/html/pic-description21.html
in order to create GRE or IP/IP tunnels. What exactly is so special in
managing a tunnel that one needs a special line card as compared to IOS
that provides tunnel support for free in IOS? Do most ISPs buy the tunnel
PIC when ordering a router or do you wait till a tunnel is needed?
Thanks,
Hank
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