From: Joe Chang (changjoe@earthlink.net)
Date: Mon Jan 13 2003 - 15:53:37 GMT-3
You can adjust the delay settings on the remote site routers, thereby
influencing the feasable distance of received routes. Having said that, is
delay or bandwidth adjustable at the subinterface level? I'm guessing it
should be, since delay and bw are really just logical, not physical, values.
----- Original Message -----
From: "Vinay Arora" <cybervinay@yahoo.com>
To: "'Stong, Ian C [GMG]'" <Ian.C.Stong@mail.sprint.com>;
<ccielab@groupstudy.com>
Sent: Monday, January 13, 2003 3:01 PM
Subject: RE: Selecting a preferred route when using EIGRP
> I provided the link for reference to EIGRP tweaking and does not depict my
> scenario.
> The remote sites have only one physical link to frame relay provider and
> have 2 PVCs one each to both head ends. Tweaking the EIGRP parameters will
> allow to select the PVC circuit I want to use at the remote site.
>
> Since both heads will be talking EIGRP with each others and both will have
> routes to all remote sites, how do I designate half of the remote sites
to
> be active on head-end 1 and remaining half on head-end 2?
>
> Vinay
>
>
> -----Original Message-----
> From: Stong, Ian C [GMG] [mailto:Ian.C.Stong@mail.sprint.com]
> Sent: Monday, January 13, 2003 1:51 PM
> To: Vinay Arora; ccielab@groupstudy.com
> Subject: RE: Selecting a preferred route when using EIGRP
>
>
> I haven't implemented this in production in awhile since most larger
> networks use OSPF or ISIS so take with a grain of salt...
> I'm not clear as to your remote sites and whether they will also have
> redundant links but will assume not. If you have equal cost paths into
your
> network you can let EIGRP naturally load balance from the provider to your
> network. I'm not sure that the link and configs you provided apply to
your
> situation. The likelihood is your remote sites will compute the total
cost
> from end to end and take whichever pipe has the least total cost. You can
> influence the paths some by using more than the standard bandwidth and
delay
> that are used by default but not sure how much that would buy you if the
> links turn out to have equal costs. If the costs are not equal than one
> will be preferred over the other of course. If you do decide to tweak I
> would suggest using the bandwidth and administrative distance options with
> care. Try the other options first such as changing the composite metric
or
> delay values.
>
>
> Best of luck,
>
> Ian
>
> www.ccie4u.com
> Rack Rentals and Scenarios
>
>
> -----Original Message-----
> From: Vinay Arora [mailto:cybervinay@yahoo.com]
> Sent: Monday, January 13, 2003 12:55 PM
> To: ccielab@groupstudy.com
> Subject: Selecting a preferred route when using EIGRP
>
>
> We have a hub and spoke architecture with all remote sites being connected
> to and accessing servers at the central site. EIGRP is the routing
protocol
> and remote sites need to communicate to central site only and not to each
> other.
>
> We will be having two physical frame-relay T1 pipes at central site to the
> frame relay provider's cloud. These two will be terminating to different
> head end routers at central site. We will be having two PVCs each for
remote
> locations and these PVCs will terminate on different head-end routers.
>
> I need to make half of the PVC active on first head end and remaining PVC
on
> second head-end.
> When one of the head-end routers goes down the PVC on second should
> automatically become active.
> I know I will have to do changes to the EIGRP config of routers at remote
> locations (EIGRP variables delay, offset, AD, BW etc.)
>
> I am considering the various options for selecting a preferred route when
> using EIGRP as detailed in the document at
> http://www.cisco.com/warp/public/103/14.shtml#O2
>
> This is a very common scenario and I want to check how people do it
> normally? Appreciate any thoughts, ideas and concerns.
>
> TIA
>
> Vinay Arora
> .
> .
.
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