3. Create an IPSec tunnel between Router A and Router C to encrypt the GRE encapsulated
multicast packets.
Data Preparation
To complete the configuration, you need the following data:
l Data for configuring the routing protocol for the backbone network
l Source address and destination address of the GRE tunnel
l IP addresses of the interfaces on both ends of the GRE tunnel
l Parameters for configuring IKE such as pre-shared-key and remote-name
l Data for configuring IPSec such as IPSec proposal name and ACL
Procedure
Step 1 Configure the routing protocol.
Configure a routing protocol on Router A, Router B, and Router C to implement the interworking
between these devices. OSPF is configured in this example. The configuration details are not
mentioned here.
After the configuration,
l Router A and Router C are routable.
l Router A can successfully ping GE1/0/0 of Router C.
l Router C can successfully ping GE1/0/0 of Router A.
Step 2 Configure the interfaces of the GRE tunnel.
# Configure Router A.
[RouterA] interface tunnel0/0/1
[RouterA-Tunnel0/0/1] ip address 40.1.1.1 255.255.255.0
[RouterA-Tunnel0/0/1] tunnel-protocol gre
[RouterA-Tunnel0/0/1] source 20.1.1.1
[RouterA-Tunnel0/0/1] destination 30.1.1.2
[RouterA-Tunnel0/0/1] quit
# Configure Router C.
[RouterC] interface tunnel0/0/1
[RouterC-Tunnel0/0/1] ip address 40.1.1.2 255.255.255.0
[RouterC-Tunnel0/0/1] tunnel-protocol gre
[RouterC-Tunnel0/0/1] source 30.1.1.2
[RouterC-Tunnel0/0/1] destination 20.1.1.1
[RouterC-Tunnel0/0/1] quit
After the configuration,
l The GRE tunnel between Router A and Router C is set up.
l The status of the tunnel interfaces is Up.
Step 3 Enable multicast.
# Enable the multicast routing protocol globally. Enable PIM DM on the tunnel interfaces, and
enable PIM DM and IGMP on the interfaces connected to the PCs.
# Configure Router A.
[RouterA] multicast routing-enable
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 1 GRE Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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