GRE tunnels created by the Zscaler Cloudblade
must require a security policy (v1) or security policy set(v2) to
be applied to the site for tunnel creation. The security policy
and zone must be created and mapped to the site. The Cloudblade
automatically places the servicelink GRE tunnel into the security zone.
The CloudBlade typically creates two GRE tunnels, a Primary tunnel
to Data center one and a Secondary GRE tunnel to Data center two.
If
a policy or zone is removed later, the CloudBlade ignores all GRE
operations performed on that site. This includes creating, updating
or re-querying.