From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Fri Aug 17 2007 - 10:50:43 ART
Hi Bit,
Good job there!
Now we know the offset is added to the composite metric. Whether it's
applied outbound/inbound, the router will adjust the total delay component
to produce that offseted composite metric.
Hey, where did you find that wonderful formula?
10 microsend of delay = 256 metric unit
Thank you.
B.Rgds,
Lim TS
On 8/17/07, Bit Gossip <bit.gossip@chello.nl> wrote:
>
> Ok, now I think I understand the trick: the lab proved that 1 offset unit
> = 1 metric unit
> Then IOS, to keep the metric consistent with the variables that determine
> the metrics, adjusts the delay accordingy:
>
> 10 microsend of delay = 256 metric unit
>
> And this is exactly what we can see in the lab:
>
> R6(config)#router eigrp 1
> R6(config-router)#offset-list 0 in 256
> R6(config-router)#
> *Mar 1 22:56:44.343: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 1.1.1.1(Serial0/1) is resync: route configuration changed
> R6(config-router)#do show ip eigrp 1 topology 150.1.1.0/24
> <....>
> Total delay is 25010 microseconds
> R6(config-router)#offset-list 0 in 128
> *Mar 1 22:58:21.426: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 1.1.1.1(Serial0/1) is resync: route configuration changed
>
> do show ip eigrp 1 topology 150.1.1.0/24
> <....>
> Total delay is 25005 microseconds
>
> And without any offset-list the total delay is 25000 !
>
> Two bits from bit.
>
> ----- Original Message -----
>
> *From:* Toh Soon, Lim <tohsoon28@gmail.com>
> *To:* Bit Gossip <bit.gossip@chello.nl>
> *Cc:* Sadiq Yakasai <sadiqtanko@gmail.com> ; ccielab@groupstudy.com
> *Sent:* Thursday, August 16, 2007 10:30 AM
> *Subject:* Re: How offset-list works in EIGRP?
>
>
> Hi Bit,
>
> If you do "sh ip ei top 150.1.1.0 255.255.255.0", do you notice there's an
> increase in the total delay component of the route?
>
> This delay value will be propagated to downstream neighbors, effectively
> causing all downstream routers to offset the metric of the route by 1.
> Correct me if I miss any point.
>
>
> Thank you.
>
> B.Rgds,
> Lim TS
>
>
> On 8/16/07, Bit Gossip <bit.gossip@chello.nl> wrote:
> >
> > Here the docs seems not to be correct: an offset of 1 adds just 1 to the
> > metric not 256 as someone would understand from doccd
> >
> > Bit.
> >
> > no offset-list applied:
> >
> > R6#show ip route
> > <....>
> > D 150.1.1.0 [90/20640000] via 1.1.1.1, 00:00:13, Serial0/1
> >
> > ~~~~~~~~~~~~~~~~~~~~~
> >
> > router eigrp 1
> > offset-list 0 in 1
> >
> > R6(config-router)#do show ip route eigrp 1
> > 150.1.0.0/24 is subnetted, 1 subnets
> > D 150.1.1.0 [90/20640001] via 1.1.1.1, 00:00:06, Serial0/1
> >
> > ----- Original Message -----
> > From: "Sadiq Yakasai" <sadiqtanko@gmail.com>
> > To: "Toh Soon, Lim" <tohsoon28@gmail.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Wednesday, August 15, 2007 6:48 PM
> > Subject: Re: How offset-list works in EIGRP?
> >
> >
> > > Hi Toh,
> > >
> > > EIGRP offset list add the delay components on the composite metric
> > > addvertised either in or out of an interface.
> > >
> > > For example, if u configure an offset-list and add 1 to an inbound
> > > interface, all EIGRP routes learnt via that interface will increment
> > > the delay component of the route by 1, thereby incresing the total
> > > metric by 256.
> > >
> > > HTH
> > >
> > > Sadiq
> > >
> > >
> > _______________________________________________________________________
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
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