![]() This lab will continue to build upon the topology previously used in Lab 8-3 as shown below and other labs found through out Section 8. EIGRP stub neighbors will not be queried during EIGRP re-convergence. This command is executed in privileged mode to display which eigrp neighbors are stub routers. You can however specify additional stub configuration following the command such as static or redistribute. The default configuration will send directly connected routes and summary routes and receive all routes via an upstream neighbor. This command is executed in the EIGRP routing process configuration mode to specify a router as a stub router. You will configure R5 as an EIGRP stub router and verify your configuration.įamiliarize yourself with the following new command(s) CommandĮigrp stub R5 only has a single network it routes for which is 10.80.50.0/24. In this lab R5 is a branch office and R4 is a regional office. You can verify which neighbors are stub neighbors by using the show ip eigrp neighbors detail command in privileged mode. To configure the EIGRP stub type navigate to the EIGRP router process configuration mode then use the eigrp stub command. The CCNA exam objectives only requires you to be familiar with the basic EIGRP stub operation however if you wish to further your knowledge you may experiment with the other EIGRP stub types. This type of stub can be used in conjecture with the other stub types excluding receive-only. This type of stub can be used in conjecture with the other stub types excluding receive-only.Ĭonfigures an EIGRP router as a stub router that will only advertise summary routes. This type of stub can be used in conjecture with the other stub types excluding receive-only.Ĭonfigures an EIGRP router as a stub router that will only advertise static routes. When using this stub type static routes must be configured upstream to reach networks within this stub area.Ĭonfigures an EIGRP router as a stub router that will only advertise redistributed routes. This type of stub can be used in conjecture with the other stub types excluding receive-only.Ĭonfigures a router as a stub router that advertises only route prefixes that match a specific ip prefix-list.Ĭonfigures an EIGRP router as a stub router that will ONLY receive routes from upstream and not advertise any routes to its neighboring routers. This is the default stub configuration if additional syntax is not specified such as the following listed below the default stub will send both connected and summary routes and receive all routes from upstream neighbors.Ĭonfigures a router as a stub router that advertises only directly connected routes. ![]() ![]() The list compiled below shows the different types of stub networks that eigrp can be configured as Command There are seven different types of EIGRP stubs but the CCNA scope only coves the basic stub which is will receive all EIGRP routes but send only connected and summary routes. When a router has formed a stub neighbor adjacency with another router, the stub eigrp neighbor will not be sent any queries so this effectively speeds up network convergence as now there’s one less router to query in case of a route failure. So R5 becomes a prime candidate to become a stub eigrp router in which case will receive all routes but only advertise connected and summary routes upstream. With all of this information brought to the table does R5 really need to be queried regarding networks upstream when it only has one point of entry into the network? That’s a definite no. ![]() So in a worst case scenario, such problems can result in your routing table automagically disappearing… The more routers you have the more queries you have and the more queries and latency you have the greater the chance routers in your network will become SIA (Stuck in Active), in which case any neighboring EIGRP nodes that does not return a query reply in the specified thread hold will be dropped and any routes learned via that neighbor will be also removed from the routing table even if the routes were up. ![]()
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