Item
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Description
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Destination IP
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Displays the IP address of the GRE destination CTC or Cisco Transport Manager (CTM) computer.
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Destination IP Mask
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Displays the IP address subnet mask of the destination CTC or CTM computer.
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OSPF Cost
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Displays the cost for sending packets across the GRE tunnel. Cost is used by OSPF routers to calculate the shortest path.
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Destination NSAP
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Displays the destination NE NSAP address. The NSAP Selector (last two NSAP characters) must be 2f (GRE tunnel), or cc (proprietary Cisco tunnel), depending on which tunnel type you want to create. The Cisco proprietary tunnel is slightly more efficient than the GRE tunnel because it does not add an encapsulation header for each IP packet, while GRE adds a small header to the packets. The two tunnel types are not compatible. Most Cisco routers support the Cisco tunnel, while only a few support both GRE and Cisco IP tunnels. You generally will create Cisco IP tunnels if you're tunneling between two Cisco routers or between a Cisco router and an ONS node.
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Create
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Displays the Create GRE Tunnel dialog box where you can create GRE tunnels.
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Edit
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Displays the Edit GRE Tunnel dialog box to edit the selected GRE tunnel.
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Delete
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Deletes the selected GRE tunnel.
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Help
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Displays context-sensitive help.
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