Re: Mcast RP redundancy Question

Hi. There are a couple of things to consider:
1. This will work, but it also depends on a topology. If the backup will be
first in the path from source to receiver, and primary will be down along
the line, you may have problems. E.G. topology: Src -- Bkp -- Pri -- Rcv

2. BSR is clearly protocol of choice here.

3. With Auto-RP you still need a way to define PRIMARY and BACKUP, since
using simplest method it will function more like PRIMARY-PRIMARY

But do not forget another choice - static RP. Dynamic choice overwrites
statically configured one, therefore you can configure:
STATIC:
R1 services groups: 232.x.x.x to 239.x.x.x (Set-2)
R2 services groups: 224.x.x.x to 231.x.x.x (Set-1)

DYNAMIC (Either AutoRP or BSR):
R1 services groups: 224.x.x.x to 231.x.x.x (Set-1)
R2 services groups: 232.x.x.x to 239.x.x.x (Set-2)

Just don't use "force" option when defining static mappings.

On Tue, Apr 14, 2009 at 9:03 AM, Naveen <navin.ms_at_gmail.com> wrote:

> Group,
>
> One of the tasks I have is to have multiple RPs for the different set of
> Mcast groups but still provide redundancy.
>
> R1 services groups: 224.x.x.x to 231.x.x.x (Set-1)
> R2 services groups: 232.x.x.x to 239.x.x.x (Set-2)
>
> *Task*: R1 and R2 should be the RPs for their respective groups, but each
> should serve as a backup for other.
>
> *Question is* - which protocol should I use to provide redundancy ? BSR,
> Auto-RP or Anycast RP ?
>
> *1) In Auto-RP: *
> Let R1 and R2 announce themselves as RPs for entire 224.0.0.0/8, but have
> the MA select R1 for first set and R2 for second set.
> If either R1 or R2 is dead, the MA will select the other as the RP for all
> groups.
>
> *2) BSR: *
> Let R1 announce itself as cRP for Set-1 with priority = 100 and for Set-2
> with priority = 200
> Let R2 announce itself as cRP for Set-1 with priority = 200 and for Set-2
> with priority = 100
> When the BSR announces the Group-to-RP-Set, individual routers will select
> one of them.
> If either R1 or R2 fails, all routers will use the other.
>
> *3) Anycast RP*
> Hide both R1 and R2 behind the same IP address and advertise this IP
> address
> as RP using Auto-RP or BSR.
>
> Thanks,
> Naveen.
>
>
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