Refer to the following.
CE_RP#
Interface Ethernet 0/0
Ip address 1.1.5.4 255.255.255.0
Ip pim sparse-dense-mode
Ip pim accept-rp 10.2.2.2 8
Ip pim send-rp-announce Ethernet0/0 score 15
Ip pim send-rp-discovery scope 15
Access-list 8 permit 224.0.0.0.255.255.255
CE_RP# show ip pim rp mapping
PIM Group-to-RP Mappings
This system is an RP (Auto-RP)
This system is an RP-mapping agent
Group (s) 224.0.0.0/4
RP 1.1.5.4 (?), v2v1
Info source: 1.1.5.4 (?), via Auto-RP
Uptime: 01:00:48 expires 00:03:03
Access-list 8 permit 224.0.0.0.0.255.255.255
CE_RP# show ip pim rp mapping
PIM Group-to-RP Mappings
This system is an RP (Auto-RP)
This system is an RP-mapping agent
Group (s) 224.0.0.0/4
RP 1.1.5.4 (?), v2v1
Info source: 1.1.5.4 (?), via Auto-RP
Uptime: 01:00:48, expires : 00:02:07
CE_RP is configured as a rendezvous point in an IPv4 multicast domain.
This router receives this syslog message
00:55:15: %PIM-6-INVALID_RP_JOIN:Received (*,224.1.1.1)
Join from 1.1.6.2 for invalid RP 1.1.5.4
00:55:15: %PIM-6-INVALID_RP_JOIN:Received (*^24.1.1.1)
Join from 1.1.6.2 for invalid RP 1.1.5.4
What is the root cause of this issue?
A. A PIM neighbor is sending a PIMv6 message to CE_RP, however IPv6 multicast is not enabled on this router.
B. The multicast application from the 1.1.5.4 source is using a reserved IPv4 multicast address
C. A downstream PIM router sent a join message ,whichCE_RP does not want to accept
D. CE_RP is not configured to be an RP for multicast group 224.1.1 .Lit should not have received this RP-Join packet.
