RIPv2 done!

So finally I was able to finish RIPv2. I went through the UniverCD and read RIPv2 and then took some notes. I will post my notes about RIPv2 first followed by EIGRP in the next post.

Doesn’t matter which routing protocol you are working with, “show ip protocols” is your friend. It will display tons of information more than you will ever need.

“Flash-update-threshold” command suppresses flash updates when the arrival of a regularly scheduled periodic update matches, or is less than the number of seconds (0-30) that is configured.

RIPv2 supports two modes of authentication on an interface, plain text and md5. Default authentication in every RIPv2 packet is plain text.

RIP validates the source IP address of all incoming packets. Reason is that before it accepts routes from a neighbor, it wants to make sure that the neighbor is on the same ip subnet as the link between the two. If the two routers are on a different address space, you can turn off this feature by using “no validate-update-source” command.

You can inject default route in RIPv2 routing domain with one of the following

• ip default-network
• default-information-originate
• default rotue

An offset list is the mechanism for increasing incoming and outgoing metrics to routes learned via RIP. Optionally, you can limit the offset list with either an access list or an interface.

Router(config-router)# offset-list [access-list-number | access-list-name] {in | out} offset [interface-type interface-number]

“Passive-Interface” command can be configured to force routers to send unicast updates to each other.

By default router adds no delay between packets in a multiple-packet RIP update being sent. If you have a high-end router sending to a low-speed router, you might want to add such interpacket delay to RIP updates, in the range of 8 to 50 milliseconds.

Router(config-router)# output-delay milliseconds

We can also increase the input-queue size on the low-speed router so it prevents routing information from beind lost.

Router(config-router)# input-queue size

In a hub and spoke network, if the hub router is configured in a multipoint manner using a sub-interface, then IP split horizon is enabled. If the hub router is configured in a multipoint manner using the physical interface, then the split horizon is disabled. We can use the “Show ip interface interface” command to verify this.

RIPv2 all done – time to wrap up EIGRP.