In the diagram, all routers use IS-IS as the routing protocol. The number beside each link represents its metric value.
What path will traffic take from router R6 to router R3, and from router R3 to router R6?
A Level 1 router forwards traffic destined outside its area to the nearest attached L1/L2 router. R6 therefore sends traffic through R5; R5 reaches R3 most efficiently through R2, for R6-R5-R2-R3. R3 selects R4 as its nearest L1/L2 router, and R4’s lowest-metric Level 2 path toward R5 is through R7, producing R3-R4-R7-R5-R6. Juniper IS-IS Overview
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