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To pass the BSCI exam and earn your CCNP, you have got to know ISIS inside and out. There are numerous similarities amongst ISIS and OSPF, but a single major distinction is that ISIS has three diverse types of routers - Level 1 (L1), Level 2 (L2), and L1/L2.

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

L1 routers have no particular routing table entries relating to any destination outdoors their own location they will use an L1/L2 router as a default gateway to reach any external networks. ISIS L1 routers in the same area ought to synchronize their databases with each and every other.

Just as we have L1 routers, we also have L2 routers. Anytime we're routing in between areas (inter-location routing), an L2 or L1/L2 router should be involved. All L2 routers will have synchronized databases as well.

Both L1 and L2 routers send out their own hellos. As with OSPF, hello packets let ISIS routers to type adjacencies. The important 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 form an adjacency.

An ISIS router can act as an L1 and an L2 router at the very same time these routers are L1/L2 routers. An L1/L2 router can have neighbors in separate ISIS regions. The L1/L2 router will have two separate databases, even though - one particular for L1 routes and one more for L2 routes. L1/L2 is the default setting for Cisco routers running ISIS. The L1/L2 router is the router that makes it feasible for an L1 router to send data to another place.

In the next portion of my ISIS tutorial, we'll take a far more detailed appear at those ISIS hellos! ionways delphi alkaline water filter talk alkaline water filter talk