The new MTU takes effect only after you run the shutdown command and the undo
shutdown command on the interface.
Step 7 Choose one of the following commands to configure the IP address of the tunnel interface.
l Run the ip address ip-address { mask | mask-length } [ sub ] command to configure the IP
address of the tunnel interface.
l Run the ip address unnumbered interface interface-type interface-number command to
configure IP unnumbered for the tunnel interface.
To support dynamic routing protocols on a tunnel, configure a network address for the tunnel
interface. The network address of the tunnel interface may not be a public address, but should
be in the same network segment on both ends of the tunnel.
By default, the network address of a tunnel interface is not set.
----End
1.3.3 Configuring Routes for the Tunnel
Routes for a tunnel must be available on both the source and destination devices so that packets
encapsulated with GRE can be forwarded correctly. A route passing through tunnel interfaces
can be a static route or a dynamic route.
Context
Perform the following steps on the devices at two ends of a tunnel.
NOTE
The packets encapsulated with GRE are forwarded correctly only if the routes for the tunnel are available
on both the source and destination routers.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Choose one of the following methods to configure routes passing through the tunnel interface.
l Run the ip route-static ip-address { mask | mask-length } tunnel interface-number
[ description text ] command to configure a static route.
The static route must be configured on both ends of the tunnel. In this command, the
destination address is neither the destination address of the tunnel nor the address of the
opposite tunnel interface, but the destination address of the packet that is not encapsulated
with GRE. The outbound interface must be the local tunnel interface.
l Configure dynamic routes using IGP or BGP. Details for the procedure are not provided here.
For the configuration of dynamic routes, see the AR1200 Configuration Guide - IP
Routing.
When configuring a dynamic routing protocol, enable the dynamic routing protocol on both
the tunnel interface and the interface connected to the private network. To ensure correct
routing, do not choose the tunnel interface as the next hop when configuring the route to the
physical or logical interface of the destination tunnel.
Use Router A in Figure 1-3 as an example. The source interface of Tunnel 0/0/1 is GE 1/0/0
on Router A, and its destination interface is GE 2/0/0 on Router C. If a dynamic routing
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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