First Line Of A Multicast Routing Table Entry - HP 7102dl - ProCurve Secure Router Configuration Manual

Configuring Multicast Support with PIM-SM
Troubleshooting PIM-SM
13-50
Flag Name Meaning
J Join SPT • For a (*, G) entry on an RP, the RP will generate
an SP tree for group traffic immediately after a
source for that group registers with it.
• For a (*, G) entry on a non-RP PIM router, the
STP threshold has been exceeded. If this router
is an edge router for the group (as indicated by
a C flag in the entry), it will switch to the SP tree
when it receives the next multicast over the RP
tree. That is, the router will create an (S, G) entry
and send a join to its upstream SP neighbor.
• For an (S, G) entry, you may see this flag in an
(S, G) RP-bit entry with no outgoing interfaces.
The J-bit indicates that, if the router receives a
join for this group, it should join the SP tree.
T SPT-bit set The router is receiving and forwarding multicast
traffic using this source-specific entry.
After a router receives the first multicast packet
over the SP tree, it sets this bit to indicate that the
SP tree is active. If the upstream RP neighbor for
this group is different from the upstream SP
neighbor, the router also sends an (S, G) RP-bit
prune to the upstream RP neighbor.
F Register The router must send register packets to the RP for
this group. The DR sets this bit in its (S, G) entry
when it receives multicasts from a directly
connected source.
R RP-bit set The RP bit indicates that an (S, G) entry relates to
the RP tree. When a router sets an entry's RP-bit,
it recalculates the entry's incoming interface and
RPF neighbor. The RPF neighbor is now the
upstream RP neighbor.
An (S, G) entry with the R flag is used to prune
devices that are using a divergent SP tree from the
RP tree.

First Line of a Multicast Routing Table Entry

Figure 13-19 displays the information that you can view in the first line of a
multicast routing table entry.
Valid for Entry Type
• (*, G)
• (S, G)
(S, G)
(S, G)
(S, G)