This deprecated text field held the human-readable, canonical name of the tunnel a specific IPv4 CIDR route was configured to forward traffic through, back when this table was the IPv4-only mechanism for representing tunnel-based routes. An administrator reading this on older Junos releases would use it to identify which named tunnel interface a given static or learned route's traffic was actually being sent through. For example, this field might have contained a value like "gr-0/0/0.0", naming the specific GRE tunnel interface carrying that route's traffic; on current Junos deployments, the equivalent, non-deprecated jnxInetCidrRouteTunnelName object should be used instead.