6 good questions and answers about "IS-IS - Areas in IS-IS"

What do L2 router advertise?
-L1 routes from directly connected network
-L1 routes from it's own area
-L1 link-state database injected into its L2 LSP (not leaked)
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What are the three flags used with IS-IS?
-OL Overload flag
-P partition bit (not implemented)
-ATT Attached
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What does the IS-IS ATT flag when the bit is set?
When router recieves an LSP with ATT flag set, it will install the route as the default route.
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When is the overload bit used and what happens when it is set to 0?
Used when link-state database is overloaded.

SPF router's will ignore the sending router when computing shortest path
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What will still be used in SPF when overload bit is set to 0?
Directly attached networks from the sending router.

To the router can not be a transit router but the directly connect networks can still be reached.
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What is the difference for a L2 router between a L1 route or a L1 route external route?
Nothing
L2 network do not discriminate between L1 networks and external L1 networks.
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