TMS zl Management and Configuration Guide ST.1.1.100226

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Virtual Private Networks
Manage VPN Connections and GRE Tunnels
Figure 7-310. Example GRE Tunnel (with Zones)
■ Status
Tunnels that do not use keepalives can have one of two statuses:
• Enabled—The tunnel is enabled, and the TMS zl Module will send
traffic across the tunnel (as specified by routes in the routing table).
However, the remote tunnel gateway may or may not be able to
actually receive this traffic.
• Disabled—The tunnel is disabled. The TMS zl Module does not send
traffic across it, and routes that use this tunnel as the forwarding
interface are removed from the routing table.
Tunnels that use keepalives can have one of three statuses:
• Enabled/Up—The tunnel is enabled, and the remote tunnel gateway is
responding to keepalives. The TMS zl Module will send traffic across
the tunnel (as specified by routes in the routing table).
Note When you first configure a tunnel that uses keepalives, the tunnel is
considered up even though it has not yet received any responses to
keepalives.