From: Georg Pauwen (pauwen@hotmail.com)
Date: Mon Nov 29 2004 - 11:17:07 GMT-3
I guess it depends on the requirement. If the requirement is e.g. not to
waste bandwidth on other PVCs in such an environment, the ip pim nbma-mode
command is probably the solution.
Regards,
GP
>From: "Vytautas Valancius" <valas@mail.lt>
>Reply-To: "Vytautas Valancius" <valas@mail.lt>
>To: "Cisco certification" <ccielab@groupstudy.com>
>Subject: Re: Multicast that seems Duplicated
>Date: Mon, 29 Nov 2004 14:43:46 +0200
>
>Hi!
>
>I bet you have frame-relay with multipoint or physical interfaces with
>several 'frame-relay map ip x.x.x.x yyy broadcast' statement.
>
>This bahavior is called pseudo-broadcasting. When multicast packet is
>queued
>on interface it is coppied as many times as there are 'broadcast'
>statements
>in frame-relay map.
>
>Question to Group: should we try to avoid such situation or is it OK in the
>LAB?
>
>cheers,
>Vytautas Valancius
>
>
>
>
>----- Original Message -----
>From: <gladston@br.ibm.com>
>To: <ccielab@groupstudy.com>
>Sent: Monday, November 29, 2004 3:25 PM
>Subject: Multicast that seems Duplicated
>
>
> > It seems I am getting to answers from the multicast ping, but debug on
>the
>router shows it is just send one answer. Any Comments?
> >
> > R5 is pinging 239.1.1.1. R5 forwards to R4, R4 forwards to R1, R1
>forwards
>to R6. R1 and R6 joined the group 239.1.1.1:
> >
> > R5 result:
> > Reply to request 496 from 172.16.16.6, 132 ms
> > Reply to request 496 from 172.16.16.6, 120 ms
> > Reply to request 496 from 172.16.14.1, 116 ms
> > Reply to request 497 from 172.16.14.1, 104 ms
> > Reply to request 497 from 172.16.16.6, 124 ms
> > Reply to request 497 from 172.16.16.6, 112 ms
> > Reply to request 497 from 172.16.14.1, 108 ms
> >
> > R6 result:
> >
> > *Apr 21 16:12:59.296: IP(0): s=172.16.45.5 (Ethernet0) d=239.1.1.1
>id=2354, prot
> > =1, len=114(100), mroute olist null
> > *Apr 21 16:12:59.304: ICMP: echo reply sent, src 172.16.16.6, dst
>172.16.45.5
> > *Apr 21 16:12:59.308: IP(0): s=172.16.45.5 (Ethernet0) d=239.1.1.1
>id=2354, prot
> > =1, len=114(100), mroute olist null
> > r6#
> > *Apr 21 16:13:01.288: ICMP: echo reply sent, src 172.16.16.6, dst
>172.16.45.5
> > *Apr 21 16:13:01.296: IP(0): s=172.16.45.5 (Ethernet0) d=239.1.1.1
>id=2355, prot
> > =1, len=114(100), mroute olist null
> > *Apr 21 16:13:01.304: ICMP: echo reply sent, src 172.16.16.6, dst
>172.16.45.5
> > *Apr 21 16:13:01.308: IP(0): s=172.16.45.5 (Ethernet0) d=239.1.1.1
>id=2355, prot
> > =1, len=114(100), mroute olist null
> > r6#
> > *Apr 21 16:13:03.292: ICMP: echo reply sent, src 172.16.16.6, dst
>172.16.45.5
> > *Apr 21 16:13:03.296: IP(0): s=172.16.45.5 (Ethernet0) d=239.1.1.1
>id=2356, prot
> > =1, len=114(100), mroute olist null
> > *Apr 21 16:13:03.304: ICMP: echo reply sent, src 172.16.16.6, dst
>172.16.45.5
> > *Apr 21 16:13:03.308: IP(0): s=172.16.45.5 (Ethernet0) d=239.1.1.1
>id=2356, prot
> >
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