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Please see page 156 for more details. [ 39 ] CCNP ROUTE 642-902 Quick Reference by Denise Donohue CHAPTER 2 EIGRP Active Process Enhancement The Active Process Enhancement enables routers to use SIA-Queries and SIA-Replies to prevent the loss of a neighbor unnecessarily during SIA conditions. A router sends its neighbor a SIA-Query after no reply to a normal query. If the neighbor responds with a SIA-Reply, the router does not terminate the neighbor relationship after 3 minutes, because it knows the neighbor is available.

This publication is protected by copyright. Please see page 156 for more details. [ 59 ] CCNP ROUTE 642-902 Quick Reference by Denise Donohue CHAPTER 3 OSPF Area 1 is the transit area for the virtual link. Configure each end of a virtual link on the ABRs of the transit area with the command area area-number virtual-link router-id. Each end of the link is identified by its RID. The area listed in the command is the transit area, not the area being joined by the link. 10 Verify that the virtual link is up with the show ip ospf virtual-links command.

OSPF’s multiple databases use more memory the larger they are. Summarization decreases the number of routes exchanged, and thus the size of the databases. It localizes the impact of a topology change. OSPF can produce summaries within a classful network (VLSM) or summaries of blocks of classful networks (CIDR). There are two types of summarizations: n Inter-area (LSA type 3) route summarizations are using the area range command. A summary route will be created on the ABR under the OSPF routing process advertised as long as at least one subnet within the summary is active in the area.

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