From: Desmond (cciestudy@sympatico.ca)
Date: Fri Jan 10 2003 - 00:43:00 GMT-3
Thanks Brain
That is the answer.
----- Original Message -----
From: "Brian McGahan" <brian@cyscoexpert.com>
To: "'Desmond'" <cciestudy@sympatico.ca>; "'Brian McGahan'"
<brian@cyscoexpert.com>; "'Aidan Marks'" <amarks@cisco.com>
Cc: "'Joe Chang'" <changjoe@earthlink.net>; <ccielab@groupstudy.com>
Sent: Thursday, January 09, 2003 8:39 PM
Subject: RE: changing AD for EIGRP External Route (D EX)
> Desmond,
>
> Modify distance only when you are trying to manipulate the
> choice of one protocol over another. If you have multiple routes within
> that protocol, use metric to modify the path.
>
> Remember that for EIGRP, the bandwidth used in the metric
> calculation is the lowest bandwidth along the path, on a per route
> basis. This means that it is a big headache to try to influence path
> using bandwidth. If you want to manipulate the metric calculation in
> EIGRP, use delay. Delay is cumulative throughout the domain.
>
> For EIGRP, the metric calculation is as follows:
>
> metric = [k1 * bandwidth + (k2 * bandwidth)/(256 - load) + k3 * delay]
> If k5 does not equal zero, an additional operation is done:
>
> metric = metric * [k5 / (reliability + k4)]
>
> For more info on EIGRP metric calculation:
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
> ip_r/iprprt2/1rdeigrp.htm#1018140
>
>
> HTH
>
> Brian McGahan, CCIE #8593
> Director of Design and Implementation
> brian@cyscoexpert.com
>
> CyscoExpert Corporation
> Internetwork Consulting & Training
> Voice: 847.674.3392
> Fax: 847.674.2625
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Desmond
> > Sent: Thursday, January 09, 2003 4:08 PM
> > To: Brian McGahan; 'Aidan Marks'
> > Cc: 'Joe Chang'; ccielab@groupstudy.com
> > Subject: Re: changing AD for EIGRP External Route (D EX)
> >
> > Thanks Brian
> >
> > I got this one from Hellocomputer scenario.
> > R1, R2 and R3 on EIGRP domain. R3 have to go through R1 to reach R4
> > which
> > is on OSPF. I treated EIGRP as OSPF to change the AD from source R1. I
> > found
> > out it didn't work with "D EX".
> > I guess we have to use metric on R3 to make R1 be more preferable.
> e.g.
> > bandwidth, cost and ..
> >
> > ---
> > |
> > R4 OSPF
> > --------------------------
> > | | EIGRP
> > R1 R2
> > \ /
> > R3
> >
> >
> > ----- Original Message -----
> > From: "Brian McGahan" <brian@cyscoexpert.com>
> > To: "'Aidan Marks'" <amarks@cisco.com>; "'Desmond'"
> > <cciestudy@sympatico.ca>
> > Cc: "'Joe Chang'" <changjoe@earthlink.net>; <ccielab@groupstudy.com>
> > Sent: Thursday, January 09, 2003 4:58 PM
> > Subject: RE: changing AD for EIGRP External Route (D EX)
> >
> >
> > > Instead of changing the distance of the external EIGRP route,
> > > just change the distance of the competing route. For example, if
> you
> > > have a prefix in OSPF with a distance of 110, and a matching
> external
> > > EIGRP prefix, just change the OSPF distance to 171.
> > >
> > > When changing distances to influence routing, I usually
> > > recommend lowering the distance of the protocol that is higher. The
> > > reason for this is so that when you look at the routing table, you
> can
> > > see that this prefix has a lower distance for a reason. For
> example, if
> > > you have a RIP prefix competing with an OSPF prefix, and you want to
> > > route through RIP, change the distance of this prefix to 109. When
> you
> > > look in the routing table, you will remember that you lowered the
> RIP
> > > prefix to win over the OSPF route. Since OSPF is 110, the 109 would
> be
> > > the indicator that OSPF is the competing protocol. With external
> EIGRP,
> > > you do not have this option. Therefore you should raise the prefix
> in
> > > protocol with the lower distance to 171 or above.
> > >
> > > HTH
> > >
> > > Brian McGahan, CCIE #8593
> > > Director of Design and Implementation
> > > brian@cyscoexpert.com
> > >
> > > CyscoExpert Corporation
> > > Internetwork Consulting & Training
> > > Voice: 847.674.3392
> > > Fax: 847.674.2625
> > >
> > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf
> > > Of
> > > > Aidan Marks
> > > > Sent: Thursday, January 09, 2003 2:33 PM
> > > > To: Desmond
> > > > Cc: Joe Chang; ccielab@groupstudy.com
> > > > Subject: Re: changing AD for EIGRP External Route (D EX)
> > > >
> > > > This is correct, there is no way right now to change the AD of
> > > selected
> > > > eigrp external routes, it's all or nothing with the distance eigrp
> x x
> > > > command.
> > > >
> > > > Therefore doing something like "distance 170 10.20.30.40 0.0.0.0
> 100"
> > > > won't
> > > > work for externals as it applies only to internal routes.
> > > >
> > > > Aidan
> > > >
> > > > At 06:14 AM 10/01/2003, Desmond wrote:
> > > >
> > > > >The distance command only work for routes "D", not "D EX".
> > > > >
> > > > >----- Original Message -----
> > > > >From: "Joe Chang" <changjoe@earthlink.net>
> > > > >To: <ccielab@groupstudy.com>
> > > > >Sent: Thursday, January 09, 2003 11:59 AM
> > > > >Subject: Re: changing AD for EIGRP External Route (D EX)
> > > > >
> > > > >
> > > > > > Hmm, route tagging wouldn't work, the "distance" command
> doesn't
> > > allow
> > > > for
> > > > > > matching tags, and policy routing doesn't allow for setting
> AD.
> > > > > >
> > > > > > Your'e best bet is to set the distance command for the
> specific
> > > > routes.
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > From: "Desmond" <cciestudy@sympatico.ca>
> > > > > > To: <ccielab@groupstudy.com>
> > > > > > Sent: Thursday, January 09, 2003 12:45 PM
> > > > > > Subject: Re: changing AD for EIGRP External Route (D EX)
> > > > > >
> > > > > >
> > > > > > > Sorry, I missed something.
> > > > > > >
> > > > > > > I meant from particular source.
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: "Desmond" <cciestudy@sympatico.ca>
> > > > > > > To: <ccielab@groupstudy.com>
> > > > > > > Sent: Thursday, January 09, 2003 11:37 AM
> > > > > > > Subject: changing AD for EIGRP External Route (D EX)
> > > > > > >
> > > > > > >
> > > > > > > > Is there any way to change the admin distance for EIGRP D
> EX
> > > > routes ?
> > > > > > > >
> > > > > > > >
> > > > > > > > Thanks
> > > > > > > >
> > > > > > > > Desmond
> > > > > > > > .
> > > > > > > .
> > > > > > .
> > > > >.
> > > > .
> > .
> .
.
This archive was generated by hypermail 2.1.4 : Sat Feb 01 2003 - 07:33:46 GMT-3