From: Herbert Maosa (asawilunda@googlemail.com)
Date: Wed Feb 13 2008 - 18:19:21 ARST
Multicast RPF check will pass on all EIGRP interfaces that are within
EIGRP's routing table as load sharable for a particular source.
Herbert.
On Feb 13, 2008 2:12 PM, Eggert, Scott <scott.eggert@berbee.com> wrote:
> How does the multicast RPF handle the EIGRP unicast load-balancing.?
>
>
>
> I'll have to lab this and see...
>
>
>
> ________________________________
>
> From: Joseph Brunner [mailto:joe@affirmedsystems.com]
> Sent: Tuesday, February 12, 2008 6:42 PM
> To: Eggert, Scott; 'Jonny English'
> Cc: ccielab@groupstudy.com; 'Steven Hodgson'
> Subject: RE: EIGRP variance load sharing help
>
>
>
> There are to two types of multicast load balancing
>
>
>
> 1. Muliticast over a gre tunnel. The source/destination ip's of the
> tunnel are load balanced according to the igp in use
>
> 2. Multicast multipath command. Two sources of the same multicast feed
> can be load balanced.
>
>
>
> So with only one source your relegated to using just the first type of
> load balancing.
>
>
>
> HTH,
>
>
>
> Joe "All books, no lady" for 12 more months ;( Brunner
>
>
>
> ________________________________
>
> From: Eggert, Scott [mailto:scott.eggert@berbee.com]
> Sent: Tuesday, February 12, 2008 10:40 AM
> To: Jonny English
> Cc: Joseph Brunner; ccielab@groupstudy.com; Steven Hodgson
> Subject: RE: EIGRP variance load sharing help
>
>
>
> That brings up a good question as to how the EIGRP load balancing will
> affect the RPF of multicast. Later in Lab 8 I did run into a RPF issue
> with multicast in R1. In my solution the PRF issue was solved by adding
> a multicast static route on R1 (which probably violates the lab rules?).
>
>
>
> I would suspect that the multicast would load balance based on what the
> unicast protocol (eigrp) is doing?
>
>
>
>
>
> ________________________________
>
> From: Jonny English [mailto:redkidneybeans@gmail.com]
> Sent: Monday, February 11, 2008 7:53 PM
> To: Eggert, Scott
> Cc: Joseph Brunner; ccielab@groupstudy.com; Steven Hodgson
> Subject: Re: EIGRP variance load sharing help
>
>
>
> Could you potentially break multicast if you left this sort of EIGRP
> task for things to come back to if time allowed?
>
> On Feb 12, 2008 9:09 AM, Eggert, Scott <scott.eggert@berbee.com> wrote:
>
> That really threw me was that I used 1000 for the bandwidth metric in
> the RIP redistribution, I played with the Delay on both links out of R4
> and set R1, R5 delay to 1, but could not get anything to stay under the
> FD on R4. Increasing the redistribution metric to 10000 and calculating
> the metrics worked, but with much effort.
>
> Your suggestion for setting both the BW and delay to 1 and working up
> would have worked easier. I know now that this could be a good time
> waster on the real test and leave for later.
>
> Thanks.
>
>
> -----Original Message-----
> From: Joseph Brunner [mailto:joe@affirmedsystems.com]
> Sent: Monday, February 11, 2008 1:28 PM
> To: Eggert, Scott; ccielab@groupstudy.com
> Subject: RE: EIGRP variance load sharing help
>
> I could try to give you an explanation, but I'm a mere mortal. Gen.
> Brian
> Dennis himself gave a beautiful, memorable, and generally "one for the
> ages"
> description in the solutions guide.
>
> I believe this one wanted 4:1 ratio? Well you need to quickly do
> something
> to get the metrics in about that ratio? I changed bandwidth and delay
> until
> I got my solution.
>
> Try setting bandwidth to "1" and "delay to 1" and then increasing every
> so
> small along different points until the router you want to effect the
> changes
> on (the one running the eigrp metric calculation) works once the
> conditions
> are met, and it has the variance command.
>
> Don't forget,
>
> "Genius see the answer before the question"
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Eggert, Scott
>
> Sent: Monday, February 11, 2008 12:55 PM
> To: ccielab@groupstudy.com
> Subject: EIGRP variance load sharing help
>
> Can anyone offer any insight on how to quickly determine the EIGRP
> metrics for a particular variance load sharing ratio. I struggled with
> the IE lab 8 EIGRP variance question and ended up trying different
> delays and bandwidth and ultimately calculating them to figure out the
> question. However, this could eat up time if this was the real test.
> Is there a quick rule or procedure for getting a particular metric and
> load sharing ratio? In particular, Is there a way to avoid going over
> the FD?
>
>
>
> Thanks.
>
>
>
>
>
>
>
> Scott Eggert
>
> Network Engineer
>
> CDW Berbee
> 4321 W College Ave Ste 400
> Appleton, WI 54914
>
> 920.996.3014
>
> 920.284.7619 - mobile
>
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>
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>
> www.berbee.com
>
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> --
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>
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