From: Vytautas Valancius (valas@mail.lt)
Date: Mon Nov 29 2004 - 09:43:46 GMT-3
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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