From: Cisco Net (network.cisco@gmail.com)
Date: Thu Nov 04 2004 - 01:19:44 GMT-3
So here is the scenario that i just tried.
Topology:
R2----serial-----R3-----ethernet----sw2
All the routers are sparse mode
R3 is the RP responsible for 226.0.0.0 group
R3 is the MA as well and group to rp specific using the rp-announce-filter
R3:
ip pim autorp listener
ip pim spt-threshold infinity
ip pim rp-announce-filter rp-list 17 group-list 27
ip pim send-rp-announce Loopback0 scope 16 group-list 27
ip pim send-rp-discovery Loopback0 scope 16
access-list 17 permit 150.2.3.3
access-list 27 permit 226.0.0.0 0.255.255.255
Now on SW2 i have joined 2 igmp groups,
1- 226.6.6.6
2- 224.1.1.1
From R2,
I can ping only to 226.6.6.6 which is expected and iam fine with that.
From R3
I can ping to both 226.6.6.6 and 224.1.1.1
I havent enabled sparse-dense mode, i had not included this group for RP/MA.
This is what bothering me...
Now on R3 show ip mroute showing,
1) (*, 226.6.6.6), 00:05:00/00:03:23, RP 150.2.3.3, flags: S
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/0, Forward/Sparse, 00:05:00/00:03:23
--->this is fine showing as sparse mode...
(*, 224.1.1.1), 00:03:27/00:02:46, RP 0.0.0.0, flags: DP
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null
---> Not fine, showing as dense mode....
Which menas even though i had configured all the routers to use sparse
only mode (with autorp listner), the groups that i is not not be part
of autorp is falling to dense mode...
Can i assume that way ?
I thought this will happen only with sparse-dense mode...
Thank you
Regards
Cert
On Wed, 3 Nov 2004 22:14:44 -0500, Bob Sinclair <bsin@cox.net> wrote:
> Cert,
>
> With autorp listener, you will see 224.0.1.39 and 224.0.1.40 as dense mode
> groups. Autorp listener permits these two groups to use dense mode, even
> when the interfaces are configured with sparse mode only. BTW, On many
> IOS, you can enter the command - ip pim autorp listener - in global config,
> but it often does not show up in the syntax as a valid option with the
> question mark.
>
> HTH,
>
> Bob Sinclair
> CCIE #10427, CISSP, MCSE
> www.netmasterclass.net
>
>
>
> ----- Original Message -----
> From: "Cisco Net" <network.cisco@gmail.com>
> To: "Group Study" <ccielab@groupstudy.com>
> Sent: Wednesday, November 03, 2004 10:05 PM
> Subject: Auto RP with sparse mode and listner will fall in to dense mode ???
>
> > Hi
> > May be a stupid question. But i thought i better verify this.
> > Also I did not had the ip pim auto-rp listner command on my routers to
> > try this out.
> >
> > Assuming that i have configured the following
> > 1-multicast on all the routers
> > 2-ip pim sparse mode on all the interface
> > 3- enabled ip pim auto-rp listner on all the routers
> > 4- One router say R3 is configured as RP (auto RP) for a specific
> > group 230.1.1.1
> > 5- MA is already configured
> >
> > Everything should work as expected...
> > Now if i have configured igmp-join for another group 225.5.5.5 on one
> > of the router.
> > Does the ping to this group will work ?
> >
> > All routers will fall in to dense mode for this group even though
> > routers are configured for sparse only...
> >
> > Will i see 224.0.1.40 and 224.0.1.39 in my mroute table ?
> > Thank you
> > Regards
> > Cert
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
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