Configure ISO Addressing
Purpose
For a router to support IS-IS, you must configure an ISO network entity title (NET) address on one of the router’s interfaces, preferably the loopback interface (lo0).
Action
To configure ISO addressing, follow these steps:
In configuration mode, go to the following hierarchy level:
[edit]user@host# edit interfacesInclude a NET address for the loopback interface:
[edit interfaces]user@host# set lo0 unit number family iso address addressVerify and commit the configuration:
user@host# showuser@host# commit
Sample Output
user@R1> edit
Entering configuration mode
[edit]
user@R1# edit interfaces
[edit interfaces]
user@R1# set lo0 unit 0 family iso address 49.0004.1000.0000.0001.00
[edit interfaces]
userR1# show
[...Output truncated...]
lo0 {
unit 0 {
family inet {
address 10.0.0.1/32;
}
family iso {
address 49.0004.1000.0000.0001.00;
}
}
}
[edit interfaces]
user@R1# commit
commit complete
Meaning
The sample output shows that the loopback (lo0) interface is configured with the NET address 49.0004.1000.0000.0001.00. The loopback interface (lo0) becomes a point of connection from the router to the IS-IS network. Every router in an IS-IS network must have at least one ISO NET address that identifies a point of connection to the IS-IS network. The NET address is generally configured on the loopback (lo0) interface. Routers that participate in multiple areas can have multiple NET addresses.
All the routers in the network share a Level 2 database containing identical information. A common Level 2 database occurs in this case because all adjacencies are Level 2, and all routers are within the same IS-IS area (49.0004). Level 2 LSP flooding reaches all routers in the network due to the presence of a single level. For more information on determining the NET address, see the Junos Routing Protocols Configuration Guide.