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Cisco CCNA Exam Tutorial: 5 OSPF Hub-And-Spoke Aspects You should Know!

CCNA exam good results relies upon considerably on understanding the details, and if먹튀검증 there’s one particular protocol which has a lot of details, it’s OSPF! This is true specially of hub-and-spoke networks, so During this CCNA OSPF tutorial we’ll Look into several of the far more significant hub-and-spoke OSPF information. This can assist you in working with actual-world networks at the same time, considering that this OSPF community sort is amongst the more standard network topologies.

In OSPF, the hub have to grow to be the specified router (DR). The DR election’s choosing price may be the OSPF interface precedence, plus the default worth is one. It’s not plenty of to established the hub’s OSPF interface to two, having said that, since the spoke routers should not turn into the DR or BDR. You will need to set the spoke interfaces to an OSPF priority of zero.

R2(config)#int s0

R2(config-if)#ip ospf precedence 0

This ensures that the spokes will likely not come to be the DR or BDR if the hub goes down.

The hub does need a bit additional configuration, however. The neighbor command need to be used around the hub to point the IP handle on the probable neighbors.

R1(config)#router ospf 1

R1(config-router)#neighbor 172.12.123.two

R1(config-router)#neighbor 172.12.123.three

It’s common to possess an ISDN connection being a backup in an OSPF network, and when that ISDN backlink arrives up the hi there packets ought to be capable to cross the url. Anything you don’t want is usually to possess the hellos hold the url up! By configuring the ISDN website link being an OSPF demand circuit, the hyperlink will drop while in the absence of exciting site visitors, however the OSPF adjacency that formed throughout the ISDN website link are going to be assumed by the router to continue to be up. (You usually see this command configured on either side with the ISDN link, but it really’s only required on just one facet. It doesn’t harm anything to put it on either side, however.)


R2(config)#int bri0

R2(config-if)#ip ospf desire-circuit

A closing detail of OSPF hub-and-spoke and need circuits really can take place at Layer 2. With the OSPF howdy packets to correctly be transmitted throughout an ISDN hyperlink or perhaps a frame relay network, the broadcast option has to be enabled in the suitable body and dialer map statements. Failure to allow this option may lead to a scenario the place pings will probably be prosperous, but OSPF adjacencies will not sort.

R2(config-if)#dialer map ip title R1 broadcast 5551111

R2(config-if)#frame map ip 172.twelve.123.1 221 broadcast

Any time you’re troubleshooting OSPF inside of a manufacturing network or your CCNA / CCNP home lab, don’t just evaluate Layer three – simply because anything’s received being ideal with the Bodily and information link levels in order for the community layer to function appropriately!