O'Reilly logo

Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 11

A1: The difficulty with the internetwork of Figure 11.37, when running classful routing protocols on RTB, is that network 172.16.0.0 is variably subnetted. The solution is to use a 28-bit mask on RTB's E1 interface while RTC still uses a 27-bit mask for the same subnet. This solution works because 172.16.1.96 remains distinct in the internetwork of> Figure 11.37, whether it is subnetted with a 27-bit mask or a 28-bit mask.

RTB's configuration is:

interface Ethernet0 ip address 172.16.1.146 255.255.255.240!interface Ethernet1 ip address 172.16.1.98 255.255.255.240!router rip redistribute igrp 1 metric 1 passive-interface Ethernet0 network 172.16.0.0!router igrp 1 redistribute rip metric 10000 1000 255 1 1500 passive-interface Ethernet1 ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required