This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

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This blog will continue to include questions, troubleshooting scenarios, and references to existing and new technologies but will grow to include a variety of different platforms and technologies. Currently I have created over 185 questions/answers in regards to the CCIE R&S track!! Note: answers are in the comment field or within "Read More" section.

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Friday, October 15, 2010

Question 138

How do you configure RIP to use unicast when performing updates?

1 comments:

Packets Analyzed said...

RIP neigbor command uses point-to-point (nonbroadcast) to excahnge routing information. The router will still continue to send multicast/broadcast (depending on version) updates out the interface unless you use passive interface. This ensures that only unicast routing updates are sent.

Example - R1 and R2 are connected using fastethernet 0/1 and configured to use unicast routing for updates only.

R1
__

interface fastethernet 0/1
ip address 10.0.0.1 255.255.255.0

router rip
version 2
no auto
network 10.0.0.0
passive-interface fastethernet 0/1
neighbor 10.0.0.2


R2
__

interface fastethernet 0/1
ip address 10.0.0.2 255.255.255.0
interface loopback 2
ip address 192.168.0.2 255.255.255.0

router rip
version 2
no auto
network 10.0.0.0
network 192.168.0.0
passive-interface default (ensures all interfaces are passive)
neighbor 10.0.0.1

do a "debug ip rip" to ensure that you are only using unicast

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