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How Does Router MC Implement GRE?

April 26, 2017GRE implement MC Router

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How Does Router MC Implement GRE?

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Router MC implements a double Interior Gateway Protocol (IGP) solution for GRE. An IGP refers to a group of devices that receive routing updates from one another by means of a routing protocol, either EIGRP or OSPF. Each “routing group” is identified by a logical number. For general routing purposes, the interfaces on the routers in your networks belong to an IGP. Router MC does not manage this existing IGP. Rather, it adds an additional IGP that is dedicated for IPSec and GRE secured communication. This additional IGP is known as the secured IGP. The existing IGP (unsecured IGP), is used for routing traffic that does not require encryption. When a GRE tunnel is established, a virtual interface is configured on each peering device. These virtual interfaces are the endpoints of the GRE tunnel. Each virtual interface is unique and is assigned with its own crypto map. The GRE tunnel interface has an IP address (inside tunnel IP address) which is taken from a loopback interface that Router