From: Andrew Lissitz \(alissitz\) (alissitz@cisco.com)
Date: Tue Dec 06 2005 - 14:18:03 GMT-3
When there is no RP, the default behavior for the router is to
'fallback' to dense mode.
Dense mode is 'flood and prune'. In other words, dense mode assumes all
interfaces are interested in this multicast traffic unless the router
receives a prune message on that interface.
There is no RP in dense mode, so if the RP goes away, or the routers can
not reach the RP ... The default behavior is to become dense mode.
By configuring the interface as sparse-dense mode, you are allowing this
interface to be either sparse or dense.
Since BSR uses pim for its advertisements you can configure the
interface to be sparse-mode only. If an interface is sparse-mode only
... It can not operate in dense mode.
Does this answer your questions?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
andervb@yahoo.dk
Sent: Tuesday, December 06, 2005 12:00 PM
To: ccielab@groupstudy.com
Subject: Sparse-dense.
If I cofigure Router(config-if)# ip pim sparse-dense-mode
and BSR for the RP definition .
If the router announces as the RP for group 224.0.0.0 7.255.255.255 is
down , there is no backup:
Is the bsr will stop working?
Are the other routers will learn the the 224.0.0 7.255.255.255
dynamically as dense mode ?
regards,
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