From: dara tomar (wish2ie@gmail.com)
Date: Thu Oct 25 2007 - 03:53:22 ART
Hmmmmmm....
And Really great for us :) :) :) !!!!
Regards,
Dara
On 10/25/07, Brian Dennis <bdennis@internetworkexpert.com> wrote:
>
> So the difference between something complex (tag using device# + AD) and
> something simple (tag using only AD) is only 1 digit? Seems like a pretty
> fine line you've drawn there ;-)
>
> Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> >----- Original Message -----
> Subject: RE: Redistribution with route tags are KILLING ME!!!`
> Date: Wed, October 24, 2007 22:15
> From: "Scott Morris" <smorris@ipexpert.com>
>
> > If you have multiple routers redistributing the same routes adding the
> > device number to the tag may be a necessary thing, but in a simpler rule
> > does it help any? (e.g. personal choice) :)
> >
> > Let's not make things more thought provoking than necessary. In my
> > experience watching people use tags and working through redistribution
> > problems, it's easier for them to remember AD values as that has more
> likely
> > been ingrained in their brains for years thereby reducing the thought
> > processes needed to come up with tags or watch things happen.
> >
> > Both obviously work perfectly fine, I simply look at it for simplicity.
> >
> > The tag for connected is an interesting idea.... I'd never thought of
> that,
> > but likely because I never worried about a routing look with connected
> > interfaces before. But an interesting idea!
> >
> >
> > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> JNCIE-M
> > #153, JNCIS-ER, CISSP, et al.
> > CCSI/JNCI-M/JNCI-ER
> > VP - Technical Training - IPexpert, Inc.
> > IPexpert Sr. Technical Instructor
> >
> > A Cisco Learning Partner - We Accept Learning Credits!
> >
> > smorris@ipexpert.com
> >
> > Telephone: +1.810.326.1444
> > Fax: +1.810.454.0130
> > http://www.ipexpert.com
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Brian Dennis
> > Sent: Wednesday, October 24, 2007 11:46 PM
> > To: Scott Vermillion
> > Cc: 'Herbert Maosa'; 'Joseph Brunner'; 'Jeffrey Biggs';
> > ccielab@groupstudy.com
> > Subject: Re: Redistribution with route tags are KILLING ME!!!`
> >
> > If you are going to tag use the device number plus the administrative
> > distance of the routes being redistributed (i.e. R2 OSPF = 2110 or R6
> > connected = 60).
> >
> > Also we have a free route redistribution vseminar on November 14th
> that's
> > open to everyone. We'll limit this vseminar to only 300 people so sign
> up
> > early if you are interested as the last one on Catalyst QoS pushed the
> > limits of the vseminar software ;-)
> >
> > --
> >
> > Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
> > bdennis@internetworkexpert.com
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com
> > Toll Free: 877-224-8987
> > Direct: 775-852-3995 (Outside the US and Canada)
> >
> > Scott Vermillion wrote:
> > > I don't know, I thought Scott Morris's idea of tagging all routes with
> > their
> > > "native" AD was quite brilliant. Sure makes things easy to keep
> straight
> > > (although I confess I haven't done too much in the way of
> redistribution
> > > labs at this juncture in my studies, so I'm certainly no expert on the
> > > subject).
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > > Herbert Maosa
> > > Sent: Wednesday, October 24, 2007 4:37 PM
> > > To: Joseph Brunner
> > > Cc: Jeffrey Biggs; ccielab@groupstudy.com
> > > Subject: Re: Redistribution with route tags are KILLING ME!!!`
> > >
> > > Actually, I use route-tags in two cases
> > >
> > > - one of the protocols is already carrying external routes from
> > > elsewhere
> > > - one of the protocols is RIP, which has no concept of External
> routes
> > >
> > > Except for these two cases, so far I successfullly implement loop free
> > > redistribution by matching internal routes ( in the case of OSPF ) or
> > > matching route-type Internal ( for the case of EIGRP ).
> > >
> > > I think the use of route-tags is generally overused, perhaps
> overtrained,
> > so
> > > much so that you end up using it on every redistribution scenario
> without
> > > understanding what you are trying to accomplish. Could waste quite a
> lot
> > of
> > > time at the best, and you could get it all wrong at the worst !
> > >
> > > .
> > > Herbert.
> > >
> > > On 10/24/07, Joseph Brunner <joe@affirmedsystems.com> wrote:
> > >> Wait slow down...
> > >>
> > >> You only NEED to use redistribution with route-tags when you have
> more
> > >> than
> > >> 1 router doing mutual route re-distribution. We use the tags to block
> > >> route
> > >> feedback. That is, if a route has been redistributed already at
> either
> > >> router it wont be re-redistributed back to the source protocol at the
> > >> other
> > >> router.
> > >>
> > >> Here is an example... R3 and R4 are redistributing between EIGRP
> & OSPF.
> > >> To
> > >> prevent a loop we don't allow route feedback from a protocol back
> into a
> > >> protocol. Anything going from OSPF to EIGRP, and EIGRP to OSPF is
> tagged
> > >> and
> > >> the redistribution at other router denies routes with that tag before
> > >> redistribution. The tags allow us to know WHERE that route originally
> > came
> > >> from.
> > >>
> > >> Here is the topology
> > >>
> > >> R1---OSPF--- R3--- EIGRP-AS-10--- R5
> > >> | |
> > >> R2---OSPF--- R4--- EIGRP-AS-10--- R6
> > >>
> > >>
> > >> R3&R4
> > >>
> > >> Router ospf 1
> > >> Redis eigrp 10 subnets route-map watch-tag
> > >>
> > >> Router eigrp 10
> > >> Redistribute ospf 1 route-map watch-tag metric 1500 100 255 1 1500
> > >>
> > >> Route-map watch-tag deny 5
> > >> Match tag 5
> > >> Route-map watch-tag permit 10
> > >> Set tag 5
> > >>
> > >>
> > >> Try it with my topology in your dynamips...
> > >>
> > >>
> > >> -----Original Message-----
> > >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > >> Jeffrey Biggs
> > >> Sent: Wednesday, October 24, 2007 4:48 PM
> > >> To: ccielab@groupstudy.com
> > >> Subject: Redistribution with route tags are KILLING ME!!!`
> > >>
> > >> I have been trying to grasp the use of redistribution using only
> route
> > >> tags,
> > >> but I just keep getting killed by it. I can redistribute using
> > >> prefix-lists
> > >> and ACL's all day long, but I know I am going to see something where
> I
> > >> need
> > >> to "make sure all IP's are fully reachable without the use of
> > >> ACL's/Prefix-lists" and I am going go down in flames..Is there
> someone
> > out
> > >> there that has a solution that can help me??????? I have used NMC
> and
> > >> IPEXPERT (BOTH VERY GOOD TOOLS, NOT KNOCKING ANY OTHERS) but my brain
> is
> > >> just not grasping the concept.
> > >>
> > >>
> > >>
> > >> HELP!!!!!!!
> > >>
> > >>
> > >>
> > >> Thanks
> > >> JB
> > >>
> > >>
> _______________________________________________________________________
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> > >>
> > >>
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> > >
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> > >
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