HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 123
IS-IS network types, Network types, DIS and pseudonodes
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passing through the Level-1-2 router may not be the best. To solve this problem, IS-IS provides the route leaking feature. Route leaking enables a Level-1-2 router to advertise the routes of other Level-1 areas and the Level-2 area to the connected Level-1 area so that the Level-1 routers can select the optimal routes for packets. IS-IS network types Network types IS-IS supports the broadcast network (for example, Ethernet and Token Ring) and the point-to-point network (for example, PPP and HDLC). For an NBMA interface, such as an ATM interface, you must configure point-to-point or broadcast subinterfaces. IS-IS cannot run on P2MP links. DIS and pseudonodes IS-IS routers on a broadcast network must elect a DIS. The Level-1 and Level-2 DISs are elected separately. You can assign different priorities to a router for different level DIS elections. The higher the router priority, the more likely the router becomes the DIS. If multiple routers with the same highest DIS priority exist, the one with the highest Subnetwork Point of Attachment (SNPA) address (MAC address on a broadcast network) will be elected. A router can be the DIS for different levels. IS-IS DIS election differs from OSPF DIS election in the following ways: • A router with priority 0 can also participate in the DIS election. • When a router with a higher priority is added to the network, an LSP flooding process is performed to elect the router as the new DIS. As shown in Figure 33, the same level routers on a network, including non-DIS routers, establish adjacency with each other. Figure 33 DIS in the IS-IS broadcast network L1/L2 L1/L2 L2 adjacencies L1 adjacencies L1 DIS L2 DIS The DIS creates and updates pseudonodes, and generates LSPs for the pseudonodes, to describe all routers on the network. A pseudonode represents a virtual node on the broadcast network. It is not a real router. In IS-IS, it is identified by the system ID of the DIS and a 1-byte Circuit ID (a non-zero value). Using pseudonodes simplifies network topology and can reduce the amount of resources consumed by SPF. 112