EIGRP Network statement

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Following along in the Boson SIM and I have a question about entering
network commands for EIGRP.  It states for subnet 160.10.1.0 /24 the correct
commands would be...

Router1(config)# router eigrp 100
Router1(config-router)# network 160.10.0.0

But since EIGRP is classless shouldn't it include the subnet portion and
be...

Router1(config)# router eigrp 100
Router1(config-router)# network 160.10.1.0

If not how does it know what the subnet's are?

Tim






Re: EIGRP Network statement


If memory serves me I think you need a wildcard instead of subnet mask, or
maybe that is just ospf

Sorry....its getting late
S.c.


On 6/2/05 8:43 PM, in article
GAOne.14645$w21.14309@newsread3.news.atl.earthlink.net, "Tim Pope"

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Re: EIGRP Network statement



The network statement determines which interfaces of the router are
participating in the eigrp process.  The subnet masks information
come from the interfaces.  EIGRP will automatically summarize at
the classful boundary unless you disable it with "no auto-summary".

Doan

On Fri, 3 Jun 2005, sean courtney wrote:

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Re: EIGRP Network statement


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correct

It is only classless if you tell it to be.  The default mask (or wildcard)
will be assumed if you do not provide one.  In your case 160.10/16 is
assumed and it will include all subnets within.  You could have entered
'network 160.10.1.0 0.0.0.255' to accomplish what you are asking.  BTW -
make sure you do a no auto-summary.

Hope that helps,

Jim




Re: EIGRP Network statement


Tim Pope wrote:

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Riddle me this...what exactly does the "network ..." statement mean in
EIGRP and OSPF configuration?

It has nothing whatever to do with "advertise this network."  In EIGRP,
OSPF, and RIPV2, it just tells the router to run the routing protocol
on whatever interface matches the network command.  Later IOSes allowed
you to specify the wildcard (or the mask, either works) in EIGRP so you
can can fine tune on what interfaces you to run EIGRP.  OSPF has always
has the wildcard support.


--

hsb


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Re: EIGRP Network statement


Tim Pope wrote:
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auto summary will use a classful boundary. To get more specific use ip
summary-address on the interface.


     Router1(config)#router eigrp 100

     Router1(config-router)#no auto-summary

     Router1(config-router)#exit

     Router1(config)#interface serial 0/0

     Router1(config-if)#ip summary-address eigrp 100 160.10.1.0
255.255.255.0


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