
Appendix B Site-to-Site  VPN User Interface Reference
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  | Site to Site VPN Policies  | 
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Table  | GRE Modes Page > GRE or GRE Dynamic IP Policy (continued)  | ||
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Element | 
  | Description  | |
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AS Number  | 
  | Available only if you selected the EIGRP routing protocol.  | |
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  | The number that will be used to identify the autonomous system  | |
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  | (AS) area to which the EIGRP packet belongs. The range is  | |
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  | An autonomous system (AS) is a collection of networks that share  | |
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  | a common routing strategy. An AS can be divided into a number of  | |
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  | areas, which are groups of contiguous networks and attached hosts.  | |
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  | Routers with multiple interfaces can participate in multiple areas.  | |
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  | An AS ID identifies the area to which the packet belongs. All  | |
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  | EIGRP packets are associated with a single area, so all devices must  | |
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  | have the same AS number.  | |
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Process Number  | 
  | Available only if you selected the OSPF routing protocol.  | |
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  | The routing process ID number that will be used to identify the  | |
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  | secured IGP that Security Manager adds when configuring GRE.  | |
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  | The range is   | |
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  | Security Manager adds an additional Interior Gateway Protocol  | |
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  | (IGP) that is dedicated for IPSec and GRE secured communication.  | |
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  | An IGP refers to a group of devices that receive routing updates  | |
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  | from one another by means of a routing protocol. Each “routing  | |
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  | group” is identified by the process number.  | |
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  | For more information, see How Does Security Manager Implement  | |
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  | GRE?, page  | |
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Hello Interval  | 
  | Available only if you selected the EIGRP routing protocol.  | |
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  | The interval between hello packets sent on the interface, from 1 to  | |
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  | 65535 seconds. The default is 5 seconds.  | |
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Hold Time  | 
  | Available only if you selected the EIGRP routing protocol.  | |
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  | The number of seconds the router will wait to receive a hello  | |
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  | message before invalidating the connection. The range is   | |
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  | The default hold time is 15 seconds (three times the hello interval).  | |
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  | User Guide for Cisco Security Manager 3.0.1  | 
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