November 1999
Intermediate to advanced
576 pages
15h 3m
English
book
Large-Scale IP Network Solutions (CCIE Professional Development)
by Khalid Raza - CCIE, Mark Turner
Content preview from Large-Scale IP Network Solutions (CCIE Professional Development)
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Split Horizon and Enhanced IGRP
Recall that a split horizon occurs when a router will not advertise a route on the same interface from which it learned the route. In Figure 8-16, router D1 will advertise network 10.1.4.0 to D2 on serial 2/1, but D1 will not send it back to D4 on serial 2/0 because D1 learned this route from D4 on serial 2/0.
Figure 8-16 shows that the D1 router does not readvertise the route to itself, which assists in preventing routing loops.
Figure 8-16. Split Horizon
By default, split horizon is enabled on all LAN and point-to-point interfaces, but it is disabled on all NBMA networks for all distance-vector protocols, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.