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Learning by Doing: CISCO Certified Network ... - SCN Research

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On Optik you should see:<br />

optik#debug ip rip<br />

RIP protocol debugging is on<br />

01:26:35: RIP: sending v1 update to 255.255.255.255 via Ethernet0/0<br />

(161.20.1.1) - suppressing null update<br />

01:26:35: RIP: sending v1 update to 255.255.255.255 via Serial0/1 (161.20.4.2)<br />

01:26:35: subnet 161.20.5.0, metric 1<br />

01:26:35: RIP: sending v1 update to 255.255.255.255 via Loopback0 (161.20.5.1)<br />

01:26:35: subnet 161.20.4.0, metric 1<br />

01:26:35: subnet 161.20.3.0, metric 2<br />

01:26:42: RIP: received v1 update from 161.20.4.1 on Serial0/1<br />

01:26:42: 161.20.3.0 in 1 hops<br />

optik#undebug ip rip<br />

RIP protocol debugging is off<br />

optik#<br />

Compare this to these logic flow charts:<br />

How RIP sends updates (for example from Phiber to Optik):<br />

Are you part of yes Do you have<br />

my major network?<br />

the same subnet<br />

mask?<br />

no no yes<br />

Router “Phiber” summarizes Router “Phiber” drops Router “Phiber”<br />

at the major net boundary and the network and does advertises the<br />

advertises the network. not advertise it. Subnet.<br />

How RIP receives updates (for example on Phiber to Optik):<br />

Is the subnet received on the no<br />

same major net as the intf.<br />

that received the update?<br />

Do any subnets of this major<br />

network already exist in the<br />

routing table?<br />

yes yes no<br />

Router “Optik” applies the ignore the update Router “Optik”<br />

mask of the interface that<br />

applies a classful<br />

received the update.<br />

mask.<br />

213

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