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Configuration Guide - VPN

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of VPN, including GRE, BGP/MPLS IP VPN, BGP/MPLS IPv6 VPN, VLL, PWE3, and VPLS.
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Enlarging the Operation Scope of a Network with a Hop Limit

Enlarging the Operation Scope of a Network with a Hop Limit

As shown in Figure 1-4, the networks run the IP protocol. Assume that the IP protocol limits the hop count to 255. If the hop count between two PCs is more than 255, they cannot communicate with each other. You can set up a GRE tunnel between two devices on the network to hide the hops between them. This enlarges the network operation scope.

For example, the Routing Information Protocol (RIP) protocol defines that a route is unreachable when the hop count reaches 16. You can configure a GRE tunnel between two devices to reduce the hop count of the RIP route passing through the GRE tunnel to less than 16. Then the route is reachable.

Figure 1-4 Enlarging the network operation scope

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Updated: 2019-04-03

Document ID: EDOC1100075353

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