Re: sink RP...

Based on the explanation of a sink RP, I don't think that it is
necessary to filter when doing a sink RP. The sink RP's job is just to
prevent a group from reverting to dense mode if AutoRP doesn't find an
RP.

---Excerpt begin---

Sparse-Dense Mode for Auto-RP

A prerequisite of Auto-RP is that all interfaces must be configured in
sparse-dense mode using the ip pim sparse-dense-mode interface
configuration command. An interface configured in sparse-dense mode is
treated in either sparse mode or dense mode of operation, depending on
which mode the multicast group operates. If a multicast group has a
known RP, the interface is treated in sparse mode. If a group has no
known RP, the interface is treated in dense mode and data will be
flooded over this interface.

To successfully implement Auto-RP and prevent any groups other than
224.0.1.39 and 224.0.1.40 from operating in dense mode, we recommend
configuring a "sink RP" (also known as "RP of last resort"). A sink RP
is a statically configured RP that may or may not actually exist in
the network. Configuring a sink RP does not interfere with Auto-RP
operation because, by default, Auto-RP messages supersede static RP
configurations. We recommend configuring a sink RP for all possible
multicast groups in your network, because it is possible for an
unknown or unexpected source to become active. If no RP is configured
to limit source registration, the group may revert to dense mode
operation and be flooded with data.

--Excerpt end--

Source: http://www.cisco.com/en/US/docs/ios/solutions_docs/ip_multicast/White_papers/rps.html

(I had to look it up too.)

On Sun, Sep 6, 2009 at 11:14 PM, Jacob Uecker <juecker_at_ccbootcamp.com> wrote:
>
> I don't believe I've heard the term "sink RP". What are you trying to
> accomplish?
>
> Thanks,
>
> Jacob Uecker
> CCIE# 24481
>
> Development Engineer
> CCBOOTCAMP - Cisco Learning Solutions Partner (CLSP)
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> ________________________________
>
> From: nobody_at_groupstudy.com on behalf of Ronald Johns
> Sent: Sun 9/6/2009 5:26 PM
> To: ccie forum
> Subject: sink RP...
>
>
>
> Is it necessary to filter 224.0.1.39 and .40 when configuring a sink RP? I
> came across this in a practice lab and didn't do this, but my RP mapping
> (using auto-rp) still showed up okay:
>
> R1#sh ip pim rp map
> PIM Group-to-RP Mappings
>
> Group(s) 225.0.144.1/32
> RP 2.2.2.2 (?), v2v1, bidir
> Info source: 2.2.2.2 (?), elected via Auto-RP
> Uptime: 23:15:07, expires: 00:02:41
> Group(s) 225.0.144.2/32
> RP 2.2.2.2 (?), v2v1, bidir
> Info source: 2.2.2.2 (?), elected via Auto-RP
> Uptime: 23:15:07, expires: 00:02:45
> Group(s) 225.0.144.3/32
> RP 2.2.2.2 (?), v2v1, bidir
> Info source: 2.2.2.2 (?), elected via Auto-RP
> Uptime: 23:15:07, expires: 00:02:41
> Group(s) 225.0.144.4/32
> RP 2.2.2.2 (?), v2v1, bidir
> Info source: 2.2.2.2 (?), elected via Auto-RP
> Uptime: 23:15:07, expires: 00:02:42
> Group(s): 224.0.0.0/4, Static
> RP: 1.1.1.1 (?)
>
> Thanks,
>
> Ron Johns
> Sr. Network Engineer
> IT Department
> CCNP, CCDP, CCSP, CISSP
> AT&T WiFi Services
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William McCall, CCIE #25044
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