TMS zl Management and Configuration Guide ST.1.2.100916

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Virtual Private Networks
Manage VPN Connections and GRE Tunnels
• Enabled/Down—The tunnel is enabled; however, the TMS zl Module
has failed to receive a response to its keepalives. (The number of
keepalives that must fail in a row is specified by the Retries setting in
the tunnel configuration.) The module does not send traffic across
this tunnel, and routes that use this tunnel as the forwarding interface
are removed from the routing table. However, the module does con-
tinue to send keepalives on the tunnel; if it later receives a response
to a keepalive, the tunnel comes back up, and any routes removed
from the routing table when the tunnel went down are added once
again.
• Disabled—The tunnel is disabled. The TMS zl Module does not send
any traffic (including keepalives) across it, and routes that use this
tunnel as the forwarding interface are removed from the routing table.
If you want to see more details about the tunnel’s activity, click view in the
Traffic Information column. The Traffic Information for <tunnel name> window is
displayed.
Figure 7-311. Traffic Information for <tunnel name> Window
The Tunnel State area displays more information about the status, including:
■ Status—The current status and the length of time that this status has been
in effect
■ Changed—The date and time at which the status last changed