From: Bob Sinclair (bsin@cox.net)
Date: Sat Feb 28 2004 - 23:49:38 GMT-3
Auto-RP will work fine without a group-list. For lab purposes, I would
only suggest a group list if it was specified that some groups were not to
use sparse mode.
Auto-RP has required sparse-dense mode because the distribution of RP
information has been distributed by dense mode groups: 224.0.1.39 for
candidate RPs and 224.0.1.40 for mapping agent data.
In other words, before you could distribute regular ip multicast streams
using sparse mode, you had to first distribute auto-rp mappings using dense
mode.
Very recently, the command: ip pim autorp listener was added to make it
possible to distribute the auto-rp mapping information without using dense
mode.
The BSR method does not require dense mode at all, but uses the reserved PIM
address 244.0.0.13 to distribute the mapping info on a neighbor-to-neigbor
basis.
HTH,
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: <ihatecisco@att.net>
To: <ccielab@groupstudy.com>
Sent: Saturday, February 28, 2004 9:34 PM
Subject: PIM Sparse-Dense / Auto-RP
> I am just wanting to go over my understanding of Auto-RP, specifically how
it
> relates to ip pim sparse-dense-mode
>
> When you configure auto-rp. You setup the RP/Mapping agent as
>
> ip multicast-routing
> ip pim send-rp-annouce loopback0 scope 255 (no group list)
> ip pim send-rp-discovery scope 128
>
> interface lo0
> ip address 10.1.1.1 255.255.255.0
> ip pim sparse-dense-mode
>
> interface eth0
> ip address 192.168.1.1 255.255.255.0
> ip pim sparse-dense-mode
>
>
> -----------------------------------
>
> So in this instance we are sending out the PIM Auto-RP advertisement for
the
> entire multicast address range.
>
> 224.0.0.0/4
>
> 128 * 64 * 32 * 16 * 8 * 4 * 2 * 1
> --------------------------------------------------------------------------
--- > -- > 1 1 1 0 | 0 0 0 0 > > This covers the entire multicast range. > > > According to the cisco configuration documentation. [very limited and obscure > might i add] It states that sparse-dense mode will operate as sparse mode for > multicast groups that have RP's defined, and sparse mode for groups that do > not have RPs defined. > > Do you have to specificially configure the ip send-rp-announce command with an > access list, or is using the default behavior, [all multicast groups] still > "play nice" with sparse-dense mode? > > Any questions or comments welcome. > > **Reading the FM** > > _______________________________________________________________________ > 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 Mar 05 2004 - 07:13:59 GMT-3