The following flags are commonly used in a PIM routing table.

Upstream/Downstream State Machine

The upstream state machine identifies the state of each (*, G) or (S, G) entry, and the downstream state machine identifies the state of each downstream interface.

WC Flag

The wild card (WC) flag indicates a (*, G). This flag cannot be set in an (S, G) entry.

EXT Flag

The EXT flag applies only to (*, G) entries. This flag indicates that a switch interface receives the membership report from a user device, but the owner of the interface is not Protocol

Independent Multicast (PIM).

This flag is set in a (*, G) entry when the owner of the downstream interface is not PIM. For example, the owner is Internet Group Management Protocol (IGMP), IGMP static, or IGMP SSM mapping.

NIIF Flag

The NIIF flag is set in a (*, G) entry when this entry has a local receiver or an EXT flag, but no rendezvous point (RP) exists or the route to the RP is non-convex. This flag is set in a (*, G) entry in the following situations:

•  No RP is configured on the local switch.
•  There is no route to the RP.
•  PIM is disabled on the inbound interface connected to the RP.

This flag is set in an (S, G) entry when the entry has no upstream interface.

2MSDP

The 2MSDP flag is set in an (S, G) entry to indicate that the local switch has received register packets for an (S, G) entry.
If the local switch is an RP, it sets the 2MSDP flag in an (S, G) entry when receiving a register packet for this entry.

MSDP Flag

The MSDP flag is set in an (S, G) entry to indicate that this entry is created after the local switch receives an MSDP SA packet.

LOC Flag
The LOC flag is applicable only to (S, G) entries. When this flag is set in an (S, G) entry:

•  The local switch is directly connected to the multicast source specified in the (S, G) entry.
•  The SPT flag is also set in the (S, G) entry.
•  The inbound interface on the local switch is connected to the multicast source.
•  The local switch can send register packets only if the designated router is configured on the inbound interface.

ACT Flag
The ACT flag is set in an (S, G) entry to indicate that this entry has been used to forward multicast data or register packets for the entry have been received within a certain period. PIM sets the ACT flag in an (S, G) entry when multicast data packets or register packets match the entry. After setting this flag, the system delivers the (S, G) entry to the multicast forwarding information base (MFIB).
The system checks (S, G) entries in the MFIB every 15 seconds. If no multicast data packet or register packet matching an (S, G) entry is received within 15 seconds, the system considers the entry inactive and deletes the ACT flag from the entry.

SWT Flag
The SWT flag is set in an (S, G) entry to indicate that the entry is switching from a rendezvous point tree (RPT) to a shortest path tree (SPT).

SPT Flag
The SPT is set in an (S, G) entry to indicate that the entry has switched to an SPT.

RPT Flag
The RPT flag is set in an (S, G) entry to indicate that the upstream interface is in pruned state. This flag is set when the (S, G) entry is on an RPT but does not need to receive data from the RPT.

SQ Flag
The SQ flag applies only to (S, G) entries created on a multicast virtual private network (MVPN). This flag indicates that the source in an entry has sent a Switch-Group message.

RQ Flag
The RQ flag applies only to (S, G) entries created on an MVPN. This flag indicates that the group in an entry has received a Switch-Group message.

DEL Flag
The DEL flag is set in a (*, G) or an (S, G) entry when the entry needs to be deleted.

SG_RCVR Flag
The SG_RCVR flag is set in an (S, G) entry to indicate that the entry has a receiver on the local subnet. This flag is set in an (S, G) entry created when the following conditions are met:

•  The owner of the downstream interface is PIM.
•  A static source specific multicast mapping (SSM) entry is configured on the downstream interface.

•  The downstream interface has a route to the multicast source.

SGJOIN Flag
The SGJOIN flag is set in an (S, G) entry to indicate that an active receiver of the multicast source has joined the group. This flag is set in an (S, G) when the following conditions are met:

•  The owner of the downstream interface is not PIM.
•  A static SSM entry is configured on the downstream interface.
•  The downstream interface has a route to the multicast source.

NONBR Flag
The NONBR flag is set in a (*, G) or an (S, G) entry to indicate that no route to the upstream neighbor is found. The reason is that the upstream neighbor only has a global IP address but not a link-local address. This flag is used only in IPv6 multicast.