Study Session Number 6! RIP, EIGRP! EXTENDED! #7

Hi Everyone!

Today I'm going to go into more depth about RIP and EIGRP, in the last study session that consisted of these two topics the depth I went into about each topic wasn't as much as it needed to be, I figured ill cover the areas that were missed in this section of the blog. 

So! 

For RIP - there is two versions, the first is a legacy edition thats very outdated and not used anymore, the reason that this is the case is that with version 1 the router would use broadcast (255.255.255.255) update messages, this essentially would slow down the network as devices would receive updates that they didn't need! This lead to version 2 of RIP, to try avoid the broadcast problem version 2 uses the multicast (224) address by doing this only the devices that needed to know updates received them, version 2 also supports authentication unlike version 1. Version one of RIP supports no auto summerisation, because of this subnet masking & vlsm are unavailable as the subnet mask gets summarized, Ill show you an example - 

If a a subnet mask of 255.255.255.128 got put into version 1 this would be summarized to 255.255.255.0 - this would then allow more devices access that dont need it and is also a security issue. Summerization was added in RIPv2.

The most recent version of RIP is RIPng, this wont be discussed as it is out-width the scope of the CCNA but this is used to support IPv6 addressing.

Commands 
Router rip 
    version 2 (if using version 2)
    auto-summary OR ip summary-address rip *network ID* *subnet mask*
    network *network ID*
    default-information originate - used to add in default static route.

Verify
show ip route (R in routing table)
show ip protocols  
show ip rip database
show run | section rip

EIGRP is a much better protocol than RIP, it still uses the multicast address to send out its routing updates but its network convergence time is superior as the network updates are sent out more frequently and uses bounded updates these updates are ones that get sent only to the router that is affected by the change. EIGRP supports equal cost load balancing this is set to 4 paths by default but can be manually configured up to 16 paths, EIGRP also supports unequal load balancing no other protocol supports this. 

Commands 
router eigrp *AS number* - the AS numbers need to be the same on each router configuration to allow the devices to communicate. 
    network *network ID* *wildcard* - wildcard will be discussed later, its basically a reversed subnet. 
    

Verify
show ip route (R in routing table)
show ip eigrp interfaces 
show ip eigrp neighbors 
show ip protocols  
show ip eigrp database
show run | section eigrp

Good to use these in this order - 
show ip protocols  
show ip eigrp neighbors
show ip route  


























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