From: Gary Duncanson (garyduncanson@btinternet.com)
Date: Sat Sep 20 2008 - 15:53:04 ART
You can also disable automatic summarization in eigrp and get over the
network wildcard mask hassles to some extent.
no auto-summary
Doyle Vol I pp315-316
I have seen a number of variants in practice lab examples.
----- Original Message -----
From: "Huan Pham" <pnhuan@yahoo.com>
To: <ccielab@groupstudy.com>; "CCIE unnumbered" <ccie.unnumbered@gmail.com>
Sent: Saturday, September 20, 2008 11:12 AM
Subject: Re: Cisco DOCS confusion
> This is a terrible example in the DOC CD. I cannot understand why it
> exists in the DOC CD!!! It is just a terriblly wrong example, in my
> opinion.
>
>> (1) I thought all three routes were advertised by
>> "network" command under router eigrp 1
>
> No, you are not correct. All three routes are advertized by the
> redistribute static command.
>
> In the EIGRP, similar to all IGP, the network command is to specify what
> interface(s) take part in the routing protocol. It is not to advertize the
> subnets specify by that statement.
>
> EIGRP also requires you to put the wildcard mask. If you do not, then
> EIGRP a classfull network is specified.
>
> In the example
>
> router eigrp 1
> network 10.10.10.0
>
> is the same as
>
> router eigrp 1
> network 10.0.0.0
>
> or
>
> router eigrp 1
> network 10.0.0.0 0.255.255.255
>
> In EIGRP there's one special case where the network statement also
> advertizes the route, is when you do network 0.0.0.0 and you have a static
> default route. In this case, the network 0.0.0.0 statement also enables
> EIGRP on all interfaces as well.
>
> router eigrp 1
> network 0.0.0.0
> ip route 0.0.0.0 0.0.0.0 null0
>
> In the DOC CD examle, these network statments for 192.168.0.0 and
> 10.10.10.0 have nothing to do with the usage of distribute-list to control
> redistribution from Static to EIGRP!
>
>> (2) the access-list 3 permit 192.168.x.0 should have
>> wildcard mask 0.0.0.255?
>
> You are right. Doc CD is wrong.
>
>> (3) I thought all three routes were redistributed by the
>> *redistribute
>> static* router configuration?
>
> You are right. I do not know what they meant to blocked here ;) Maybe they
> mean "deny 10.10.10.0 0.0.0.255" to block the last one (???!!!)
>
>> (4) what does the *distribute-list 3 out static* command do
>> in this case?
>
> Nothing, unless they change the ACL 3 to block one of the three subnets.
> In that case, the one blocked by the ACL will not be advertized into
> EIGRP.
>
>
>
>
>
> --- On Sat, 9/20/08, CCIE unnumbered <ccie.unnumbered@gmail.com> wrote:
>
>> From: CCIE unnumbered <ccie.unnumbered@gmail.com>
>> Subject: Cisco DOCS confusion
>> To: ccielab@groupstudy.com
>> Date: Saturday, September 20, 2008, 3:20 PM
>> Dear Groupstudy Experts:
>>
>> Please find a digest from
>> http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ip_prot_indep_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1057083
>> in the end of this message, and help me explain the
>> description of the
>> section. (1) I thought all three routes were advertised by
>> "network"
>> command under router eigrp 1
>> (2) the access-list 3 permit 192.168.x.0 should have
>> wildcard mask 0.0.0.255?
>> (3) I thought all three routes were redistributed by the
>> *redistribute
>> static* router configuration?
>> (4) what does the *distribute-list 3 out static* command do
>> in this case?
>>
>> Static Routing Redistribution Example
>>
>> In the example that follows, three static routes are
>> specified, two of which
>> are to be advertised. The static routes are created by
>> specifying the
>> *redistribute
>> static* router configuration command and then specifying an
>> access list that
>> allows only those two networks to be passed to the EIGRP
>> process. Any
>> redistributed static routes should be sourced by a single
>> router to minimize
>> the likelihood of creating a routing loop.
>>
>> Router(config)# *ip route 192.168.2.0 255.255.255.0
>> 192.168.7.65
>> *
>>
>> Router(config)# *ip route 192.168.5.0 255.255.255.0
>> 192.168.7.65
>> *
>>
>> Router(config)# *ip route 10.10.10.0 255.255.255.0
>> 10.20.1.2
>> *
>>
>> Router(config)# *!
>> *
>>
>> Router(config)# *access-list 3 permit 192.168.2.0
>> 0.0.255.255
>> *
>>
>> Router(config)# *access-list 3 permit 192.168.5.0
>> 0.0.255.255
>> *
>>
>> Router(config)# *access-list 3 permit 10.10.10.0 0.0.0.255
>> *
>>
>> Router(config)# *!
>> *
>>
>> Router(config)# *router eigrp 1
>> *
>>
>> Router(config-router)# *network 192.168.0.0
>> *
>>
>> Router(config-router)# *network 10.10.10.0
>> *
>>
>> Router(config-router)# *redistribute static metric 10000
>> 100 255 1 1500
>> *
>>
>> Router(config-router)# *distribute-list 3 out static
>> *
>>
>>
>> Thanks,
>> --
>> CCIE unnumbered
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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>
>
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