Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 303)

Multi-Service IronWare Routing Configuration Guide 275
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Configuring IS-IS point-to-point over Ethernet
Configuring IS-IS point-to-point over Ethernet
IS-IS uses its neighbor’s MAC address to form an adjacency and stores the neighbors MAC address
to recognize the adjacency in the future. This is no problem with directly adjacent routers but can
become a problem when adjacency is required between routers that are more than one hop away.
To accommodate an IS-IS network with this type of configuration, the IS-IS Point-to-Point over
Ethernet feature has been developed.
Using the IS-IS Point-to-Point feature over ethernet, routers that are several hops away or available
through an IP GRE tunnel (as described in
“Configuring IS-IS over a GRE IP tunnel” on page 277)
can form an IS-IS adjacency. It can be used when only two IS’s are part of the broadcast network.
This feature is configured at the interface level of the routers that are forming an adjacency. For
example,
Figure 20 shows two Brocade devices several hops away from each other that are
configured for IS-IS adjacency.
FIGURE 20 IS-IS Point-to-Point configuration
You can use the commands in the following configurations to enable the IS-IS Point-to-Point
feature:
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 1/1
Brocade(config-if-e10000-1/1)# ip router isis
Brocade(config-if-e10000-1/1)# ip address 10.10.2.2
Brocade(config-if-e10000-1/1)# isis point-to-point
Brocade IS-IS Router B configuration
To configure Brocade IS-IS Router B 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
Syntax: [no] isis point-to-point