From: ccie2be (ccie2be@nyc.rr.com)
Date: Mon Aug 09 2004 - 11:00:24 GMT-3
Hi,
Can anyone elaborate on the following by explaining the difference in how an
interface operates depending on mode setting (sparse or dense or
sparse-dense)?
Interface Mode
Determines how the interface operates when sending/receiving multicast
traffic.
That's never been clear to me.
Thanks, Tim
----- Original Message -----
From: "TAN CHOH KOON" <tckoon@pc.jaring.my>
To: "Lord, Chris" <chris.lord@lorien.co.uk>; <ccielab@groupstudy.com>
Sent: Monday, August 09, 2004 9:46 AM
Subject: RE: PIM-SM
> Hi Chris,
>
> Answer is if you do not configure static RP for group 224.3.3.3, it
> automatically fall to Dense Mode.
> If you configure static RP for group 224.3.3.3, but let say the RP address
> is non existing in your network. 224.3.3.3 will never fall to DM.
> Configure interface with only Sparse Mode, do not mean it will never fall
to
> Dense Mode.
> It depend on your Group mode. If your configure static RP for that gorup
it
> will never fall back to DM.
> Even the RP is down or not existing !!
>
> If you able to access to Networker 2003 slide, refer to Deploying IP
> Multicast.
>
> Extract from slide
> -------------------
>
> Group Mode vs. Interface Mode
>
> Group & Interface mode are independent.
> Interface Mode
> Determines how the interface operates when sending/receiving multicast
> traffic.
> Group Mode
> Determines whether the group is Sparse or Dense.
>
> Group Mode
> Group mode is controlled by local RP info
> Local RP Information
> Stored in the Group-to-RP Mapping Cache
> May be statically configured or learned via
> Auto-RP or BSR
> If RP info exists, Group = Sparse
> If RP info does not exist, Group = Dense
> Mode Changes are automatic.
> i.e. if RP info is lost, Group falls back to Dense.
>
>
> Configuring Interface
> Interface Mode Configuration Commands
> Enables multicast forwarding on the interface.
> Controls the interfaces interfaces mode of operation.
> ip pim dense-mode
> Interface mode is set to Dense mode operation.
> ip pim sparse-mode
> Interface mode is set to Sparse mode operation.
> ip pim sparse-dense-mode
> Interface mode is determined by the Group mode.
> If Group is Dense, interface operates in Dense mode.
> If Group is Sparse, interface operates in Sparse mode.
>
>
> Regards
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Fri Sep 03 2004 - 07:02:35 GMT-3