EIGRP and IGRP question

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Hi,
It says in the book that IGRP and EIGRP automatically work together, so I
have set my lab up to observe that.  IGRP announcements go one way, and
EIGRP hellos go the other.  Neither take any notice.  Same AS (=7).  What am
I missing?

Richard.



Re: EIGRP and IGRP question
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Hi,

If IGRP and EIGRP share the same AS number they automatically redistribute
their learned routes between them.

Regards,
Gabriele



Re: EIGRP and IGRP question

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yea, that's what it says in the book, but it doesn't.  All I did was

Router1(config)# router eigrp 7
Router1(config-route)# network 172.16.0.0
Router1(config-route)# network some-other network-1

Router2(config)# router igrp 7
Router2(config-route)# network 172.16.0.0
Router2(config-route)# network some-other-network-2

and expected the two other-networks to be exchanged, but they weren't.
There must be something else I have missed (other than the point).

regards,
Richard.



Re: EIGRP and IGRP question

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It's when a router is running an EIGRP process and an IGRP process ... it
automatically redistributes routes it learns from EIGRP into IGRP and
vice-versa.

BernieM



Re: EIGRP and IGRP question

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Hi,

What you're experiencing is normal. No redistribution takes place 'cause
there aren't both igrp and eigrp instances running on the same router

Use something like this: ( using sh ip eigrp topology or sh ip route you
could see that automatic redistribution takes place )

RouterA
router eigrp 1
 network 192.168.0.0
 no auto-summary

router igrp 1
 network 172.16.0.0



RouterB
router eigrp 1
 network 192.168.0.0
 no auto-summary

router igrp 1
 network 172.17.0.0



Regards,
Gabriele



Re: EIGRP and IGRP question
Ok, I have tried again, according to advice received here.

It says in the book that igrp and eigrp AUTOMATICALLY communicate,
BUT ALL YOU SAVE is typing the redistribute

Router1
# router eigrp 7
# redistribute igrp 7   <=== THIS

Router2
#router igrp 7
#redistribute eigrp 7   <=== and THIS

so 2 statements (marked THIS) is all you save yourself typing, is that
really a great leap forward for mankind, that needs to be trumpeted as a
fantastic piece of timesaving automation in the book.  I think this is
pretty pathetic!  </rant>

Regards,
Richard



Re: EIGRP and IGRP question
Nospa wrote:
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Your not understand what people trying to say

Router 1 Speaks EIGRP
Router 2 speaks IGRP  they wont talk to each other

Its like having one Person speaking English and one speaking Chinese
they dont understand each other

But if u three

Router 1 - EIGRP
Router 2 - EIGRP and IGRP
Router 3 - IGRP

Between 1 and 2 is EIGRP
Between 2 and 3 is IGRP

But the routes that Router 2 get from Router 3 it will put it in update
message to Router 1 via EIGRP and Routers router 2 gets from Router 1 it
will send the updates to router 3 in IGRP

Re: EIGRP and IGRP question

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Thanks for replying.  I understand perfectly what is being said, but I made
an unfortunate error in my posting, it should have been

Router in the middle:
# router eigrp 7
# redistribute igrp 7   <=== THIS
#router igrp 7
#redistribute eigrp 7   <=== and THIS

My rant stands.

Thanks
Richard



Re: EIGRP and IGRP question

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No one says that eigrp and igp automatically redistributing is fantastic or
claims that it's the best piece of code ever written.  The books simply say
it happens.  You're the one making some big deal of it.  So what if it only
saves you typing a couple of lines of config.  No one cares but you.

Guess what?  IOS's also have a feature where if you press the TAB key the
current word of the command you're typing will auto complete ... even if you
only had a single letter left to type.  Why not rant and rave about that?
That takes patethic to athe next level.

BernieM



Re: EIGRP and IGRP question
Well, its just the way I read the book, I suppose.  It gave the impression
that it was a lot more than it turned out to be.  I was disappointed that
"automatically" didn't mean much.
Anyway, this thread started out as a query about how it all worked, and that
has now been established.  So thanks to all involved parties.

R.



Re: EIGRP and IGRP question

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Thanks.  Sorry for attacking you.  It was unnecessary and says more about me
than it did you.

BernieM



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