I have configured two routers to have RP of the same group 239.0.0.1, at any one time there should one RP for group 239.0.0.1, what I understand if there are two auto-rp for the same group the highest ip address wins the RP election, however this is not the case....
I just want to clarify if there are two auto-rp of the same group which router is elected as the RP?
Router 1 multicast configuration
ip pim send-rp-announce Loopback0 scope 5 group-list 1
ip pim send-rp-discovery scope 5
access-list 1 permit 239.0.0.1
!
interface Vlan10
ip address 192.168.10.1 255.255.255.0
ip router isis
ip pim sparse-dense-mode
end
!
interface Vlan30
ip address 192.168.30.1 255.255.255.0
ip router isis
ip pim sparse-dense-mode
end
!
interface Loopback0
ip address 192.168.100.150 255.255.255.255
ip router isis
ip pim sparse-dense-mode
end
ip multicast-routing
Router 2 multicast configuration
ip pim send-rp-announce Loopback0 scope 5
ip pim send-rp-discovery scope 5
!
interface Vlan10
ip address 192.168.10.2 255.255.255.0
ip router isis
ip pim sparse-dense-mode
end
!
interface Vlan30
ip address 192.168.30.2 255.255.255.0
ip router isis
ip pim sparse-dense-mode
end
!
interface Loopback0
ip address 192.168.100.151 255.255.255.255
ip router isis
ip pim sparse-dense-mode
end
ip multicast-routing
mroute
By right router 2 should be the RP since its loopback address is higher than router 1. But...
C7609-2#sh ip mroute 239.0.0.1
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.0.0.1), 01:46:45/stopped, RP 192.168.100.150, flags: SJPCF
Incoming interface: Vlan30, RPF nbr 192.168.30.1, Partial-SC
Outgoing interface list: Null
(192.168.10.103, 239.0.0.1), 00:50:00/00:02:50, flags: FT
Incoming interface: Vlan10, RPF nbr 0.0.0.0, RPF-MFD
Outgoing interface list:
Vlan30, Forward/Sparse-Dense, 00:50:01/00:02:26, H, A
C7609-2#
When I shutdown router1's loopback0 interface router2's loopback0 becomes the RP, I would like to clarify if two auto-rps are configured for the same MC group the highest ip address wins the RP election right? Or is it the other way round....
Thanks.
