From: Jim Nguyen (nhatquang@thiennam.org)
Date: Tue Apr 12 2005 - 23:50:45 GMT-3
this trouble occured when I worked with multicast on c2600-jk9s-mz.122-21a
several months ago.
After upgrading the IOS to 12.3, I did not see this bug anymore. So it's
really a BUG!
here is my note.
I use PIM spare-mode w/o auto-rp listener but the result is that PIM clients
know their RP through dense-mode
(*, 224.0.1.39), 00:05:12/00:02:59, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0, Forward/Sparse, 00:05:12/00:00:00
(*, 224.0.1.40), 00:05:25/00:00:00, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial0/0, Forward/Sparse, 00:05:25/00:00:00
FastEthernet0/0, Forward/Sparse, 00:05:25/00:00:00
from CCO:
Sparse-mode interfaces are added to the table only when periodic Join messages
are received from downstream routers, or when there is a directly connected
member on the interface. When forwarding from a LAN, sparse-mode operation
occurs if there is an RP known for the group. If so, the packets are
encapsulated and sent toward the RP. When no RP is known, the packet is
flooded in a dense-mode fashion. If the multicast traffic from a specific
source is sufficient, the receiver's first-hop router may send joins toward
the source to build a source-based distribution tree.
----- Original Message -----
From: "John Matus" <john_matus@hotmail.com>
To: <bsinclair@netmasterclass.net>; <ccielab@groupstudy.com>
Sent: Tuesday, April 12, 2005 7:27 AM
Subject: Re: multicast sparse-mode/densemode question
> so as long as you have an rp specified then you're fine? is it a safe bet
> to create an access-list for the rp that scopes out the whole multicast
> range?
>
>>From: "Bob Sinclair" <bsinclair@netmasterclass.net>
>>To: "John Matus" <john_matus@hotmail.com>, <ccielab@groupstudy.com>
>>Subject: Re: multicast sparse-mode/densemode question
>>Date: Mon, 11 Apr 2005 20:14:40 -0400
>>
>>Hi John,
>>
>>We have been seeing this behavior recently - Only sparse mode configured,
>>but does dense mode if no RP. Seems to be a bug, though I do not see one
>>noted in the bug tool.
>>
>>
>>
>>Bob Sinclair
>>CCIE #10427, CCSI 30427, CISSP
>>www.netmasterclass.net
>>
>> ----- Original Message -----
>> From: John Matus
>> To: ccielab@groupstudy.com
>> Sent: Monday, April 11, 2005 7:53 PM
>> Subject: multicast sparse-mode/densemode question
>>
>>
>> is there a point at which sparse mode will revert to dense-mode even
>>though
>> you have confured and interface to be sparse-mode? i know that after
>>the
>> first communitcation on the shared tree that spares-mode will revert to
>> SPTrees...
>>
>> _________________________________________________________________
>> Dont just search. Find. Check out the new MSN Search!
>> http://search.msn.click-url.com/go/onm00200636ave/direct/01/
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>
> _________________________________________________________________
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----- Original Message -----
From: John Matus
To: bsinclair@netmasterclass.net ; ccielab@groupstudy.com
Sent: Tuesday, April 12, 2005 7:27 AM
Subject: Re: multicast sparse-mode/densemode question
so as long as you have an rp specified then you're fine? is it a safe bet
to create an access-list for the rp that scopes out the whole multicast
range?
>From: "Bob Sinclair" <bsinclair@netmasterclass.net>
>To: "John Matus" <john_matus@hotmail.com>, <ccielab@groupstudy.com>
>Subject: Re: multicast sparse-mode/densemode question
>Date: Mon, 11 Apr 2005 20:14:40 -0400
>
>Hi John,
>
>We have been seeing this behavior recently - Only sparse mode configured,
>but does dense mode if no RP. Seems to be a bug, though I do not see one
>noted in the bug tool.
>
>
>
>Bob Sinclair
>CCIE #10427, CCSI 30427, CISSP
>www.netmasterclass.net
>
> ----- Original Message -----
> From: John Matus
> To: ccielab@groupstudy.com
> Sent: Monday, April 11, 2005 7:53 PM
> Subject: multicast sparse-mode/densemode question
>
>
> is there a point at which sparse mode will revert to dense-mode even
>though
> you have confured and interface to be sparse-mode? i know that after
>the
> first communitcation on the shared tree that spares-mode will revert to
> SPTrees...
>
> _________________________________________________________________
> Dont just search. Find. Check out the new MSN Search!
> http://search.msn.click-url.com/go/onm00200636ave/direct/01/
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
_________________________________________________________________
Dont just search. Find. Check out the new MSN Search!
http://search.msn.click-url.com/go/onm00200636ave/direct/01/
_______________________________________________________________________
Subscription information may be found at:
http://www.groupstudy.com/list/CCIELab.html
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