Multicast mtrace !

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Hi Guys,
Could u pls tell me the meaning of "none" in multicast mtrace?
Type escape sequence to abort.
Mtrace from to via RPF
From source (?) to destination (?)
Querying full reverse path...  
-1 None  []
-2 None  []
-3 None  []
-4 PIM  []

I have already enable ip multicast-routing on global, PIM-SM on interface.
Thanks so much !
 Duong Vu.

Re: Multicast mtrace !
Hello D??ng,

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 Do you see the PIM neighbours? It seems that field is meant to be the
protocol in use on those links.

 The documentations seems uniformly awful but perhaps a little wireshark and
reference to which
seems to be the genesis for mtrace could be revealing.


Re: Multicast mtrace !
Hi Martin,
Many many thanks for your reply. I use Iou Web to simulate this lab and I t
hink problem here is iou web. When I use GNS3, the mtrace output is normal.
again, thank you so much
Duong Vu

On Thursday, September 11, 2014 4:52:30 PM UTC+7, Martin Gallagher wrote:
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