HsiehNardone370
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To pass the BSCI exam and earn your CCNP, you have got to know ISIS inside and out. There are many similarities between ISIS and OSPF, but one particular significant distinction is that ISIS has 3 various sorts of routers - Level 1 (L1), Level two (L2), and L1/L2.
L1 routers are contained in a single area, and are connected to other regions by an L1/L2 router. The L1 makes use of the L1/L2 router as a default gateway to reach destinations contained in other locations, considerably like an OSPF stub router utilizes the ABR as a default gateway.
L1 routers have no precise routing table entries relating to any destination outdoors their personal region they will use an L1/L2 router as a default gateway to reach any external networks. ISIS L1 routers in the identical region must synchronize their databases with every single other.
Just as we have L1 routers, we also have L2 routers. Anytime we're routing in between areas (inter-region routing), an L2 or L1/L2 router must be involved. All L2 routers will have synchronized databases as properly.
Both L1 and L2 routers send out their own hellos. As with OSPF, hello packets allow ISIS routers to type adjacencies. The important distinction right 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 identical time these routers are L1/L2 routers. An L1/L2 router can have neighbors in separate ISIS areas. The L1/L2 router will have two separate databases, although - 1 for L1 routes and another 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 yet another area.
In the next portion of my ISIS tutorial, we'll take a a lot more comprehensive look at those ISIS hellos! --------------------------- Bloco de notas
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