FielderRocco835
出典: くみこみックス
To pass the BSCI exam and earn your CCNP, you've got to know ISIS inside and out. There are a lot of similarities between ISIS and OSPF, but one main distinction is that ISIS has three various varieties of routers - Level 1 (L1), Level two (L2), and L1/L2.
L1 routers are contained in a single place, and are connected to other places by an L1/L2 router. The L1 makes use of the L1/L2 router as a default gateway to reach destinations contained in other places, significantly like an OSPF stub router makes use of the ABR as a default gateway.
L1 routers have no particular routing table entries regarding any destination outdoors their own place they will use an L1/L2 router as a default gateway to reach any external networks. ISIS L1 routers in the same region ought to synchronize their databases with every other.
Just as we have L1 routers, we also have L2 routers. Anytime we're routing between areas (inter-location routing), an L2 or L1/L2 router should be involved. All L2 routers will have synchronized databases as well.
Each L1 and L2 routers send out their own hellos. As with OSPF, hello packets allow ISIS routers to type 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 form an adjacency.
An ISIS router can act as an L1 and an L2 router at the same time these routers are L1/L2 routers. An L1/L2 router can have neighbors in separate ISIS locations. The L1/L2 router will have two separate databases, though - 1 for L1 routes and yet another for L2 routes. L1/L2 is the default setting for Cisco routers operating ISIS. The L1/L2 router is the router that makes it possible for an L1 router to send data to another location.
In the subsequent part of my ISIS tutorial, we'll take a much more comprehensive look at these ISIS hellos! --------------------------- Bloco de notas
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