why don't we use wildcard everywhere?

for example we use them in AcLs and in OSPF but
not in EIGRP , IGRP ?

(i ask this because maybe we want to control all bits everywhere

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steve-o87

kobem wrote:

for example we use them in AcLs and in OSPF but
not in EIGRP , IGRP ?

(i ask this because maybe we want to control all bits everywhere

You can use wildcard masks with EIGRP - you will learn this as you progress in your Cisco studies. IGRP cant use them because it is classful and therefore doesn't have any concept of VLSM.

It seems like your trying to jump to all the advanced stuff before you know the basics. Have a read of these links:
EIGRP
IGRP

Google is also handy!

dmaftei

kobem wrote:

for example...

Beacuse different things were implemented by different people, and they made different design decisions.

EdTheLad

steve-o87 wrote:

IGRP cant use them because it is classful and therefore doesn't have any concept of VLSM.

It really doesnt have anything to do with vlsm, its just developers choice.

Imagine i have the following:

int s0/0
ip address 10.5.0.1 255.255.255.0
int s0/1
ip address 10.5.1.1 255.255.255.0

router igrp 1
network 10.5.0.0 0.0.255.255

There is no vlsm here,but it cannot be implemented because the of the developers choice to use a classful boundardy even though a classless network assignment would work.