Backup RP in AutoRP

January 22, 2008 @ 1:09 am · Filed under CCIE Study

Hi Topass,
It is an interesting scenario. I believe you can do this by having R1 to advertise more specific groups when it announces itself as a Candidate RP. This is done via using an ACL. Mapping Agent will pickup R1 as the RP because it advertises a more specific group range, (even though R2 has a higher IP).
Example:
R1# ip pim send-rp-announce Loopback0 scope 10 group-list 1 access-list 1 permit 224.1.1.1 ! Specify the Mgroup you are running
R2# ip pim send-rp-announce Loopback0 scope 10

I have labbed up this setup, (R1 Loop0 1.1.1.1, R2 Loop0 2.2.2.2), and I have two Multicast Group running 224.1.1.1 (which R1 is the Primary), and another unrelated Group 2.2.2.2 (just for demonstration, in which R2 is the RP by default) and got the below result:
R1#sh ip pim rp Group: 224.2.2.2, RP: 2.2.2.2, v2, uptime 00:22:57, expires 00:02:57 Group: 224.1.1.1, RP: 1.1.1.1, v2, v1, next RP-reachable in 00:00:43
R1#sh ip pim rp mapping PIM Group-to-RP Mappings This system is an RP (Auto-RP)
Group(s) 224.0.0.0/4 RP 2.2.2.2 (?), v2v1 Info source: 3.3.3.3 (?), elected via Auto-RP Uptime: 00:23:03, expires: 00:02:50 Group(s) 224.1.1.1/32 RP 1.1.1.1 (?), v2v1 Info source: 3.3.3.3 (?), elected via Auto-RP Uptime: 00:18:59, expires: 00:02:48

Cheers, Huan —–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Topass Mustpass Sent: Monday, 21 January 2008 11:13 PM To: ccielab@groupstudy.com Subject: FW: Backup RP in AutoRP
please can anyone give more information about this.
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Topass Mustpass Sent: Wednesday, January 16, 2008 9:14 AM To: ccielab@groupstudy.com Subject: Backup RP in AutoRP
I have a Scenario where I want to make R1 and R2 RP in a sparse -mode multicast uing the loopback 0 as a preffered interface on R1 and R2. R1 Lo0= 192.1.1.1 R2Lo0 =192.1.1.2 I want the R2 to be the backup RP while R1 is Primary RP.Please i need more info how to accomplish this without using Satic RP and BSR. I mean using only Autorp. I am still thinking of what will make R1 be a a primary RP even when it has a lower IP than

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