Friday, March 10, 2006


IS-IS Level 2 router for area. (Question #34)

Given the following output from a show isis database command, can you identify which of the neighbors of the router on which this command was issued is a level-2 router?

IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
R2.00-00 0x000000FD 0x0A2B 616 1/0/0
R3.00-00 0x000000EB 0x927D 367 0/0/0
R4.00-00 * 0x000000E7 0x6242 816 0/0/0
R5.00-00 0x000000E4 0x3008 744 0/0/0
R5.01-00 0x000000EF 0xC5F0 498 0/0/0

R2 has the ATT bit set to 1. So it has an inter-area connection. However, I would have thought it is an Level-1-2 router and not a Level-2 router. Is that what you meant or am I missing something?
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