Refer to the Exhibit.
The IGP is IS-IS. Routes from R1 need to be present on R6. Referring to the exhibit, what will accomplish this task?
A.
Create an L1 adjacency between R2 and R3 to allow the routes to pass through to R6.
B.
Use policy on R3 to leak R1’s routes from L2 to L1.
C.
Change the area address from 49.0003 to 49.0001 on R6 to allow R6 to accept routes from R1.
D.
Use policy on R2 to leak R1’s routes from L1 to L2.
How can R3 and R6 establish an L1 adjacency since they are not in the same domain?
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Can anyone help with this question? I am stuck on several IS-IS questions that show an L1 links between Areas with different IDs like 49.0002 and 49.0003. My understanding is that an L1 adjacency cannot be formed between routers in two different areas. What am I missing?
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Years late in a reply but,
Layer 2 routers can form adjacencies with layer 1 routers from other areas. They will be L2/L1 routers for the most part.
You would then need a policy to leak routes from L2 to L1 as L1 will only leak routes to L2 by default but not the other way around.
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Need to correct what i wrote earlier,
This question is off
since they are in two seperate areas with a L1 connection between the two, adjacency will not come up.
Both areas would have to match for the adjacency to form the way it is written here.
Other wise, the links would need to be L2 links between the routers for it to come up, And even then the routes would successfully leak into it without a routing policy.
If they were in the same area 49.0002 and it was a L1 connection between the two, then you would need a routing policy to leak routes. Otherwise only a default route would be sent over the link.
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