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In v7.x, v7.2.x, and 7.4.x, multicast PIM sparse is only supported in the default VRF or VRF 0. If PIM is implemented in another VRF on this version, it will not work, as shown in the logs below:
PIM-SM: PIM Bootstrap packet Recved.
PIM-SM: PIM Bootstrap from x.x.x.x
PIM-SM: Bootstrap message
PIM-SM: Fragment Tag: 4512
PIM-SM: Hash masklen: 32
PIM-SM: BSR priority: 155
PIM-SM: BSR: x.x.x.x (Family 1, Type 0)
PIM-SM: Nexthop for x.x.x.x unreachable
PIM-SM: Nexthop for x.x.x.x unreachable
PIM-SM: Nexthop for x.x.x.x unreachable
PIM-SM: MRIB.next_hop_rp(x.x.x.x): Can't find nexthop
PIM-SM: RPF_neighbor(BSM.BSR_ip_address) lookup failed
PIM-SM: PIM Bootstrap message is ignored by BSM process check
Useful commands:
diagnose ip multicast mroute
diagnose sys mcast-session list
diagnose ip multicast npu-session list
V7.6.1 includes a new feature to implement the PIM sparse in multiple VRFs. It can be configured by following the steps in Enhanced PIM support for VRFs—FortiOS 7.6.0 new features
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