From: Huan Pham (pnhuan@yahoo.com)
Date: Sat Sep 20 2008 - 20:02:52 ART
HI Gary,
I do not have that book in front of me. The no auto-summary command is to disable automatic summmarization of routes advertized to neighbors at classfull boundary. This is not relevant to the wildcard mask specified after the network statement.
The IOS behaviour I see is that, if you do not specify the wildcard, the router will convert it to the whole classfull network, and enables EIGRP on all interfaces that belong to that classfull network.
R1(config)#router ei 100
R1(config-router)#no auto-summary
R1(config-router)#net 150.1.1.0
R1(config-router)#
R1#sh run | s router
router eigrp 100
network 150.1.0.0
no auto-summary
--- On Sun, 9/21/08, Gary Duncanson <garyduncanson@btinternet.com> wrote:
> From: Gary Duncanson <garyduncanson@btinternet.com>
> Subject: Re: Cisco DOCS confusion
> To: "Huan Pham" <pnhuan@yahoo.com>
> Cc: "Cisco certification" <ccielab@groupstudy.com>, ccie.unnumbered@gmail.com
> Date: Sunday, September 21, 2008, 4:53 AM
> 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
> >>
> >>
> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
> _______________________________________________________________________
> > Subscription information may be found at:
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