From: John Matus (jmatus@pacbell.net)
Date: Wed Aug 18 2004 - 20:00:45 GMT-3
brian,
so if a task states something to the effect of "generate (150.1.1.1,
255.5.5.5) traffic" then just joining it to the multicast group 255.5.5.5
will do just that via this "feed"?
John D. Matus
MCSE, CCNP
Office: 818-782-2061
Cell: 818-430-8372
jmatus@pacbell.net
----- Original Message -----
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
To: "John Matus" <jmatus@pacbell.net>; "lab" <ccielab@groupstudy.com>
Sent: Wednesday, August 18, 2004 3:48 PM
Subject: RE: multicast basic question
> John,
>
> Anytime to send traffic with a multicast destination, you are
> generating a "feed". The router can generate this with features such as
> ping, traceroute, or SAA. The reason the S,G entry shows up in R2's
> routing table is because it received a "feed" from 150.1.1.1 going to
> the group 255.5.5.5. If R1 receives an ICMP echo-reply from R2, then
> the end to end path is good. If R1 doesn't receive the reply, the
> majority of the time it is due to RPF failure.
>
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
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>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > John Matus
> > Sent: Wednesday, August 18, 2004 3:51 PM
> > To: lab
> > Subject: multicast basic question
> >
> > ok, here goes...
> > in a lab scenario, one where there is no real multicast feed to play
> > with....
> > say the lab asks you to configure pim on routers 1, 2 and 3 and also
> asks
> > that
> > routers 1, 2, and 3 join multicast group 225.5.5.5. and then asks
> that
> > router
> > 1 be able to get ping responses from 2 and 3....
> >
> > when you join an interface to a multicast group ( ip igmp join-group
> > 225.5.5.5), i've noticed that it will show up in the other router's
> mroute
> > tables as (150.1.1.1, 255.5.5.5) (from r2's perspective). my
> question
> > is
> > does that somehow create a 'source' of multicast traffic since it
> shows up
> > in
> > the mroute table? some of the labs i've seen will ask you to
> configure
> > multicast and then tell you that you can use static mroutes, but i
> don't
> > see
> > how it is possible to test for RPF is there is no real multicast
> source.
> > so
> > i'm confused about 1) what a multicast source is in these lab
> scenarios
> > and 2)
> > how do you test for RPF without a 'source'
> >
> > also, if i join routers 1, 2, and 3 to multicast group 225.5.5.5,
> should
> > they
> > all respond to pings to that group....and if they don't, am i supposed
> to
> > use
> > static mroutes to get to each other? (this is all just hypothetical of
> > course)
> >
> > thanks in advance!
> >
> >
> >
> > John D. Matus
> > MCSE, CCNP
> > Office: 818-782-2061
> > Cell: 818-430-8372
> > jmatus@pacbell.net
> >
> >
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