Re: FW: Extended RAC and multicast

from all my test I call multicast a requirement from 11.2.0.2 onwards. Take care about the different Multicast networks possible in different Patch-Sets!
As you are talking about VLAN_S_ - I'd not do anything than pure switched private network. Everything else will lead to troubles sooner or later.

My .02€
 Martin

On Mon, Apr 14, 2014 at 8:29 PM, Iggy Fernandez <iggy_fernandez_at_hotmail.com>wrote:

> A friend asked me a question that I could not answer. He is in the
> planning stages of an "extended RAC deployment" and is looking for
> confirmation that multicasting is optional.
>
> Help would be appreciated.
>
> Kindest regards,
>
> Iggy
>
> --
> Iggy Fernandez
> Email: iggy_fernandez_at_hotmail.com
> Cellphone: (925) 478 3161
> Blog: So Many Manuals So Little Time <http://iggyfernandez.wordpress.com/>
> Author of Beginning Oracle Database 11*g* Administration<http://books.google.com/books?id=pdSLnG66WQkC&printsec=frontcover#v=onepage&q&f=false>
> Editor of the *NoCOUG Journal <http://bit.ly/rC2gRA>*
> Lecturer at University of Washington Professional and Continuing Education<http://www.pce.uw.edu/biography/ignatius-fernandez/>
>
>
> ------------------------------
> Date: Mon, 14 Apr 2014 11:13:03 -0700
> From: kulkarniravi_at_yahoo.com
> Subject: Extended RAC and multicast
> To: iggy_fernandez_at_hotmail.com
>
> I am looking to setup extended RAC for my client. The details are as
> following:
>
> The two data centers are separated by a distance of less than 20 miles.
>
> They are connected by a high speed dedicated connection.
>
> Operating System: RHEL 6 64 bit
>
> Database version: 11gR2 (11.2.0.3)
>
> Hardware: Four servers with 4x16 configuration
>
> All the documentation I have reviewed so far says multicast should be
> enabled on the private interconnect between all the nodes
> of a RAC database. However, my network resources tell me that multicasting
> is not enabled across the data centers and VLANs
> do not span across the data centers. The only reference I have seen to
> multicasting requirement is in this Oracle document:
>
>
> http://docs.oracle.com/cd/E16655_01/install.121/e17888/networks.htm#CWLIN476
>
> Specifically it makes the following assertion:
>
> "You do not need to enable multicast communications across routers"
>
> Does this mean, multicast is optional?
>
> Regards,
>
> Ravi Kulkarni
>
>

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