From: Joseph Brunner (joe@affirmedsystems.com)
Date: Wed Feb 13 2008 - 12:43:42 ARST
It sees just one hop, through the tunnel for type 1 from below. For type 2
the RPF is going BACKWARDS to the UNICAST SOURCE which to pass the rpf check
will be from the interface where the unicast route is learned. DOWNSTREAM
we have pim joins which we accept and THIS ROUTER will forward both sources.
-Joe
_____
From: Eggert, Scott [mailto:scott.eggert@berbee.com]
Sent: Wednesday, February 13, 2008 9:12 AM
To: Joseph Brunner; Jonny English
Cc: ccielab@groupstudy.com; Steven Hodgson
Subject: RE: EIGRP variance load sharing help
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
920.997.9419 - fax
www.berbee.com
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