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Configuration Guide - VPN

S7700 and S9700 V200R013C00

This document describes the configurations of VPN, including GRE, IPSec, BGP/MPLS IP VPN, BGP/MPLS IPv6 VPN, VLL, PWE3, VPLS, L2VPN Access to L3VPN.
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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

You can set up a GRE tunnel between two devices on a network to hide the hops between them. If a network using IP protocol limits the hop count to 255 and the hop count between two PCs is more than 255, they cannot communicate with each other. Using a GRE tunnel can negate this problem and enlarge the network operation scope, as shown in Figure 1-5.

Figure 1-5  Enlarging the network operation scope

For example, the Routing Information Protocol (RIP) protocol defines an unreachable route 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 and thereby make this route reachable.

Updated: 2019-04-08

Document ID: EDOC1100065751

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