Learn the key configuration change needed to establish Level 1 IS-IS adjacency between two Juniper routers. Discover how to modify interface settings to enable proper IS-IS neighbor relationships.
Table of Contents
Question
Click the Exhibit button.
Referring to the exhibit, what must be changed to establish a Level 1 adjacency between routers R1 and R2?
A. Change the level l disable parameter under the R1 protocols isis interface lo0.0 hierarchy to the level 2 disable parameter.
B. Add IP addresses to the interface ge-1/2/3 unit 0 family iso hierarchy on both R1 and R2.
C. Remove the level 1 disable parameter under the R2 protocols isis interface lo0.0 configuration hierarchy.
D. Change the level 1 disable parameter under the R2 protocols isis interface ge-l/2/3.0 hierarchy to the level 2 disable parameter.
Answer
The correct answer is D. On R2, under the ge-1/2/3.0 interface configuration hierarchy for IS-IS, the “level 1 disable” parameter is currently set. This prevents the interface from forming Level 1 adjacencies.
Explanation
To allow Level 1 adjacency formation, this parameter should be changed to “level 2 disable” instead. Disabling Level 2 on the interface will restrict the adjacency to Level 1 only.
The other options are incorrect:
A) Changing R1’s lo0.0 from “level 1 disable” to “level 2 disable” would prevent a Level 2 adjacency on that interface, but not establish Level 1 on ge-1/2/3.0.
B) The interfaces already have ISO family addresses configured.
C) Removing “level 1 disable” from R2’s lo0.0 would allow Level 1 on that interface, but not necessarily on ge-1/2/3.0 where it is needed.
So in summary, changing R2’s ge-1/2/3.0 from “level 1 disable” to “level 2 disable” is the key to getting a Level 1 adjacency working between these two routers.
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