From: Narbik Kocharians (narbikk@gmail.com)
Date: Thu Aug 16 2007 - 04:37:13 ART
Unbelievable
On 8/15/07, Toh Soon, Lim <tohsoon28@gmail.com> wrote:
>
> Hi,
>
> AFAIK, the "summary-address" command is able to summarize both internal
> and external EIGRP routes that cross that interface. The summarizing router
> will source the summary-address as an internal EIGRP route to its neighbors.
>
>
> There are times when you need to adjust the default AD 5 to a higher
> value. E.g. you are doing "ip summary-address eigrp 1 0.0.0.0 0.0.0.0" to
> downstream routers. This effectively suppresses all routes and sources a
> "default route". If this router also dynamically learns a default route from
> upstream router via EIGRP (maybe AD 170), it will be offset by the
> summary-address which has AD 5.
>
> Just my two cents.
>
>
> Thank you.
>
> B.Rgds,
> Lim TS
>
>
> On 8/16/07, Cecil Wilson <Cecil.Wilson@flextronics.com> wrote:
>
> > Makes sense,
> > thanks
> >
> >
> > Cecil G. Wilson
> > IT Network Services
> > Office: (901) 215-2710
> > Cell: (901) 601-6201
> > cecil.wilson@flextronics.com
> >
> >
> > -----Original Message-----
> > From: Joseph Brunner [mailto:joe@affirmedsystems.com ]
> > Sent: Wednesday, August 15, 2007 4:50 PM
> > To: Cecil Wilson; 'Narbik Kocharians'; 'Julio Carrasco'
> > Cc: ccielab@groupstudy.com
> > Subject: RE: Little question about EIGRP summary address
> >
> > The network statement is often misunderstood for IGP's. I'll help you
> > out.
> >
> > The network statement, (UNLIKE BGP) does not advertise the route into
> > the protocol. Rather, it simply matches ip addresses configured on
> > interfaces.
> > Once those interfaces are matched by the network statement,
> > eigrp/ospf/rip, etc. send hellos (in the case of eigrp/ospf) and
> > establish adjacencies. In the case of RIP, they send routing updates, as
> >
> > rip does not build neighbor adjacencies.
> >
> > If you put the network statement under BGP, the route is checked in the
> > routing table and if it exists, the network IS advertised into BGP
> > (providing all other bgp conditions are met).
> >
> > It's a discrete difference, but one worth noting in your studies. As far
> > as what is actually advertised, well that is the mask configured on the
> > interface.
> >
> > -Joe
> >
> > -----Original Message-----
> > From: Cecil Wilson [mailto:Cecil.Wilson@flextronics.com]
> > Sent: Wednesday, August 15, 2007 5:41 PM
> > To: Joseph Brunner; Narbik Kocharians; Julio Carrasco
> > Cc: ccielab@groupstudy.com
> > Subject: RE: Little question about EIGRP summary address
> >
> > Yes but my point was; there are 2 ways advertize route into EIGRP
> > or any routing protocol
> > 1. network STM under the routing protocol 2. Redistribute into
> > routing protocol
> >
> >
> > Cecil G. Wilson
> > IT Network Services
> > Office: (901) 215-2710
> > Cell: (901) 601-6201
> > cecil.wilson@flextronics.com
> >
> >
> > -----Original Message-----
> > From: Joseph Brunner [mailto:joe@affirmedsystems.com]
> > Sent: Wednesday, August 15, 2007 4:23 PM
> > To: Cecil Wilson; 'Narbik Kocharians'; 'Julio Carrasco'
> > Cc: ccielab@groupstudy.com
> > Subject: RE: Little question about EIGRP summary address
> >
> > Remember my earlier example?
> >
> > Ip route 10.10.0.0 255.255.255.0 null0254
> >
> > Router eigrp 1
> > Redis static metric 1 1 1 1 1
> >
> > Int f0/0
> > Ip summary-address eigrp 1 10.0.0.0 255.0.0.0 5
> >
> > Now the eigrp route entered the eigrp topology database via the
> > redistribution from static.
> >
> > Consider this...
> >
> > Router#Show ip int brief
> > R2#sh ip int brief
> > Interface IP-Address OK? Method Status
> > Protocol
> > FastEthernet0/0 173.17.180.3 YES NVRAM up
> > up
> > FastEthernet0/1 193.1.180.3 YES NVRAM up
> > up
> >
> > Router eigrp 1
> > Network 10.10.0.0
> >
> > Int f0/0
> > Ip summary-address eigrp 1 10.0.0.0 255.0.0.0 5
> >
> > No interface matches the network command, so the eigrp top db does not
> > include 10.x.x.x anything, so the summary is not created...
> >
> > -Joe
> >
> > -----Original Message-----
> > From: Cecil Wilson [mailto:Cecil.Wilson@flextronics.com]
> > Sent: Wednesday, August 15, 2007 5:16 PM
> > To: Joseph Brunner; Narbik Kocharians; Julio Carrasco
> > Cc: ccielab@groupstudy.com
> > Subject: RE: Little question about EIGRP summary address
> >
> > Seems contratictory by your own eg
> >
> > -redistribution from another protocol, including static -learned from an
> > eigrp neighbor -network command matching an up/up interface on the
> > router.
> >
> >
> >
> >
> > Cecil G. Wilson
> > IT Network Services
> > Office: (901) 215-2710
> > Cell: (901) 601-6201
> > cecil.wilson@flextronics.com
> >
> >
> > -----Original Message-----
> > From: Joseph Brunner [mailto: joe@affirmedsystems.com]
> > Sent: Wednesday, August 15, 2007 4:11 PM
> > To: Cecil Wilson; 'Narbik Kocharians'; 'Julio Carrasco'
> > Cc: ccielab@groupstudy.com
> > Subject: RE: Little question about EIGRP summary address
> >
> > "That is not advertising the routes in eigrp". The "network" command
> > determines on which interfaces we run eigrp on. Using the network
> > command with a non-existent interface for the purpose of later
> > generating a summary does not work.
> >
> > You can get the constituent routes for creating the summary into eigrp
> > via
> >
> > -redistribution from another protocol, including static -learned from an
> >
> > eigrp neighbor -network command matching an up/up interface on the
> > router.
> >
> > -Joe
> >
> > CCNA
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf Of
> > Cecil Wilson
> > Sent: Wednesday, August 15, 2007 3:43 PM
> > To: Narbik Kocharians; Julio Carrasco
> > Cc: ccielab@groupstudy.com
> > Subject: RE: Little question about EIGRP summary address
> >
> > Do you mean advertisizing those routes in Eigrp?
> >
> > Eg
> >
> > Router eigrp 100
> >
> > Net 10.10.10.1 0.0.0.0
> >
> > Net 10.10.11.1 0.0.0.0
> >
> > Net 10.10.12.1 0.0.0.0
> >
> >
> >
> > Int e0/0
> >
> > Summary eigrp 10.10.0.0 0.0.255.255
> >
> >
> >
> >
> >
> > Cecil G. Wilson
> >
> > IT Network Services
> >
> > Office: (901) 215-2710
> >
> > Cell: (901) 601-6201
> >
> > cecil.wilson@flextronics.com
> >
> >
> >
> >
> >
> > -----Original Message-----
> >
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> >
> > Narbik Kocharians
> >
> > Sent: Wednesday, August 15, 2007 1:31 PM
> >
> > To: Julio Carrasco
> >
> > Cc: ccielab@groupstudy.com
> >
> > Subject: Re: Little question about EIGRP summary address
> >
> >
> >
> > When ever you need to generate a summary route, those routes need to be
> >
> > advertised in the specific routing protocol before a summary is
> >
> > generated.
> >
> >
> >
> > On 8/15/07, Julio Carrasco <julio.carrasco@ya.com> wrote:
> >
> > >
> >
> > > Hello Group,
> >
> > >
> >
> > > It4s necessary to configure a component of a summary route under the
> >
> > > EIGRP proccess to announce the summary address ?, or it is just enough
> >
> >
> >
> > > having a component of the sumary route in the routing table ?
> >
> > >
> >
> > > i.e.
> >
> > >
> >
> > > R1 s0/0-------------------------------- s0/0 R2 .2 -------
> > 10.0.0.0/24
> >
> >
> >
> > > lan segment
> >
> > > .1 1.1.1.0/24 network .2
> >
> > >
> >
> > > R2 config:
> >
> > >
> >
> > > interface s0/0
> >
> > > ip address 1.1.1.2 255.255.255.0
> >
> > > ip summary-address eigrp 10 10.0.0.0 255.0.0.0 !
> >
> > > router eigrp 10
> >
> > > network 1.1.1.2 0.0.0.0
> >
> > > network 10.0.0.2 0.0.0.0 --> Do I need to add this to my config if I
> >
> > > want
> >
> > > R2
> >
> > > to announce the summary route ??
> >
> > > !
> >
> > >
> >
> > > Is this enough so R2 announces 10.0.0.0/8 network to R1,
> >
> > >
> >
> > > or do I need to configure a component of the 10.0.0.0/8 network unter
> >
> > > the EIGRP 10 proccess ??
> >
> > >
> >
> > > TIA
> >
> > > Julio
> >
> > >
> >
> > > ______________________________________________________________________
> >
> > > _ Subscription information may be found at:
> >
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> >
> > >
> >
> >
> >
> >
> >
> >
> >
> > --
> >
> > Narbik Kocharians
> >
> > CCIE# 12410 (R&S, SP, Security)
> >
> > CCSI# 30832
> >
> > www.Net-WorkBooks.com <http://www.net-workbooks.com/>
> >
> >
> >
> > _______________________________________________________________________
> >
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> >
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> >
> >
> >
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>
-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832 www.Net-WorkBooks.com
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