Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 305)

Multi-Service IronWare Routing Configuration Guide 277
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Configuring IS-IS over a GRE IP tunnel
Configuration considerations
The configuration considerations are as follows:
• When a GRE tunnel is configured, you cannot configure the same routing protocol on the
tunnel through which the device learns the route to the tunnel destination. For example, if a
device learns the tunnel destination route through the OSPF protocol, you cannot configure the
OSPF protocol on the same Tunnel and vice-versa. When a tunnel has OSPF configured, the
device cannot learn the tunnel destination route through OSPF. This will cause the system to
become unstable.
• When you have keepalive configured on both sides of a GRE tunnel, we recommend that you
disable the tunnel before changing any tunnel configurations. You can then re-enable the
tunnel to restore it to normal functionality.
• When configuring a GRE IP Tunnel, the device must be configured with one of the following
CAM Profiles: ipv4, ipv6, mpls-l3vpn, ipv4-vpn, multi-service-2 or mpls-l3vpn-2.
Configuring IS-IS over a GRE IP tunnel
Figure 21 displays a network configured for IS-IS over a GRE IP tunnel. In the example, Brocade
IS-IS Router A and Brocade IS-IS Router B are configured for adjacency. Routers Brocade C and
Brocade D are configured with a GRE IP tunnel. Following the illustration are examples of the
configurations required for IS-IS over a GRE IP tunnel.
FIGURE 21 IS-IS over a GRE IP tunnel
The following examples describe the configurations that support IS-IS over a GRE IP tunnel for each
of the routers in
Figure 21 .
Brocade IS-IS Router A configuration
To configure Brocade IS-IS Router A for the IS-IS Point-to-Point feature use the following commands.
Brocade(config)# interface ethernet 2/1
Brocade(config-if-e10000-2/1)# ip router isis
Brocade(config-if-e10000-2/1)# ip address 10.10.1.2
Brocade(config-if-e10000-2/1)# isis point-to-point