[Last Call] Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 247
  • Last Modified:

Networking Basic Questions

I got a question about networking.

Anyone know how to make a loop of length 4 in RIP, even if one uses split horizon with poisonous reverse?
0
geoffryf
Asked:
geoffryf
1 Solution
 
Don JohnstonInstructorCommented:
First of all, split horizons and poison reverse accomplish the same thing. Some vendors use one, some use the other.

So you want to make a routing loop even though split horizons or poison reverse are being used?

It's possible...But it requires a network going down and some real specific timing.

Put the four routers in a loop.


R1-------R2
|              |
R3-------R4

If R1 loses a path to a network that is not reachable through R2, 3 or 4 (say a directly connected network). It will notify R2 and R3 that the network is down. If (and here's the tricky timing part) R4 sends out an update BEFORE it learns that the network is down from R2 and R3, then it will notify those two neighbors that the network is still reachable.

Of course, if hold down timers are used, this won't happen.
0
 
geoffryfAuthor Commented:
Thank you. That clearifies my concept about RIP and Split Horizon
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now