CCNP / BSCI Certification Exam Tutorial

Passing the BCSI examination and incomes your CCNP certification calls for you to recognize OSPF stub regions internal and out. Stub regions, overall stub regions, a touch have a look at on now no longer-so-stub stub regions … and quite quickly your head is swimming. Then whilst you pay attention that EIGRP gives stub routing, your first response can be unprintable! But at the same time as EIGRP stub routing is powerful withinside the proper situation, it is now no longer as complicated as OSPF stub routing. Let’s check simple EIGRP stub routing.

While EIGRP does now no longer have the stub region alternatives that OSPF does, EIGRP does permit a router to be configured as a stub. This is generally executed with a hub-and-spoke configuration wherein the spoke routers do now no longer have the assets to preserve a complete routing table. Since the spoke’s subsequent hop will usually be the hub, all them spoke actually desires is a default direction. For this reason, the handiest neighbor an EIGRP stub router may have is the hub router. (Obviously, the hub might in no way be configured as a stub.)

Configuring EIGRP stub routers additionally combats the SIA problem. EIGRP stub routers aren’t queried for routes while the hub does now no longer have a possible successor for a successor direction that has long passed down.

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By default, EIGRP stub routers put it on the market statistics approximately forms of routes again to the hub – at once related networks and precise routes. To alternate, this default, use the eigrp stub command observed with the aid of using the forms of routes you need the stub to put it on the market again to the hub. (The eigrp stub command run with the aid of using itself configures the router as a stub.)

R1(config)#router eigrp a hundred R1(config-router)#eigrp stub?

related Do put it on the market-related routes

obtain-handiest Set IP-EIGRP as obtaining the handiest neighbor

static Do put it on the market static routes

precis Do put it on the market precis routes

For example, take into account a community wherein R5 is the hub and R4, R6, and R7 are the spokes.

As lengthy as R4, R6, and R7 have a neighbor dating handiest with the hub, they may be configured as stub routers. They will then put it on the market there at once related networks and precis routes again to the hub and could obtain handiest a default direction again from the hub. If R5 loses a successor and has no possible successor, it’ll now no longer ship a question packet to any of the stub routers.

EIGRP stub routing would not provide us all of the alternatives that OSPF stub routing does, however, it’s miles a good deal easy to configure and might significantly lessen useless Query packet transmission in a hub-and-spoke community.