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To pass the BSCI exam and earn your CCNP, you've got to know ISIS inside and out. There are numerous similarities among ISIS and OSPF, but 1 key difference is that ISIS has three diverse kinds of routers - Level 1 (L1), Level 2 (L2), and L1/L2.

L1 routers are contained in a single region, and are connected to other regions by an L1/L2 router. The L1 uses the L1/L2 router as a default gateway to reach destinations contained in other areas, considerably like an OSPF stub router utilizes the ABR as a default gateway.

L1 routers have no precise routing table entries concerning any destination outside their personal location they will use an L1/L2 router as a default gateway to reach any external networks. ISIS L1 routers in the same place need to synchronize their databases with every single other.

Just as we have L1 routers, we also have L2 routers. Anytime we're routing among regions (inter-area routing), an L2 or L1/L2 router should be involved. All L2 routers will have synchronized databases as properly.

Both L1 and L2 routers send out their personal hellos. As with OSPF, hello packets allow ISIS routers to form adjacencies. The crucial difference here is that L1 routers send out L1 hellos, and L2 routers send out L2 hellos. If you have an L1 router and an L2 router on the same link, they will not type an adjacency.

An ISIS router can act as an L1 and an L2 router at the exact same time these routers are L1/L2 routers. An L1/L2 router can have neighbors in separate ISIS places. The L1/L2 router will have two separate databases, though - one for L1 routes and yet another for L2 routes. L1/L2 is the default setting for Cisco routers running ISIS. The L1/L2 router is the router that tends to make it feasible for an L1 router to send information to yet another area.

In the next portion of my ISIS tutorial, we'll take a more comprehensive appear at those ISIS hellos! chanson water ionizer filter cartridge tumbshots here