;fw_log_drop_ex: Packet proto=103 IP_of_Standby_Member:0 -> 188.8.131.52:0 dropped by fw_cluster_ttl_anti_spoofing Reason: ttl check drop
Setting the TTL to 255 on Active member per (sk42652) does not resolve the issue: # echo 255 > /proc/sys/net/ipv4/ip_default_ttl
Disabling Extended Cluster Anti-Spoofing (per sk42652) resolves the issue.
By design, Active member ignores PIM packets sent by Standby member. Therefore, it drops them either with "Address spoofing" log, or with "Rejecting dynamic routing packet forwarded to wrong member" log.