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How many levels does ISIS have?

Latest reply: Feb 25, 2016 17:10:53 1712 1 0 0 0

How many levels does ISIS have?

  • x
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Created Feb 25, 2016 17:10:53

ISIS routing protocol has a two-level structure: Level-1 area and Level-2 area.
All the routers in Level-1 area must have the same area address and build a Level-1 neighbor relationship with each other. There's Level-1 LSDB in the whole area but no Level-2 routing information of backbone area. It's similar to the total Stubby area of OSPF.
Level-2 area consists of all the Level-2 routers and L1/L2 routers. Level-2 neighbor relationship is formed between routers in the region. There are both Level-2 LSDB and Level-1 routing information in the whole area.
L1/L2 router can simultaneously form Level-1 neighbor relationship with L1 routers and form Level-2 neighbor relationship with L2 routers. L1/L2 router has a Level-1 LSDB and a Level-2 LSDB. It advertise the Level-1 routing information to the Level-2 backbone area at the boundary of the area
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