User Manual

Protocol Independent Multicast (PIM)
308 Enterasys X-Pedition User Reference Manual
(S,G) Joins:
The XP creates an (S,G) join when it wants to join to a specific source sending to a multicast group.
This scenario typically indicates that multicast data is flowing through the network. The pim show
routes and multicast show mfc commands will reflect this state.
Note: The IP address of the server is now present, depicting a live source sending traffic—the
Multicast Forwarding Cache (MFC) also shows data forwarding through the router. The
“R” bit indicates that this flow is RPT Pruned from the RP, or that the data should not be
received from the RPF interface of the RP.
Looking at R3:
Note: The “S” bit denotes that this multicast flow is currently joined to the SPT or shortest path
tree for the data.
R5# pim show route
PIM Routes:
FLAGS: R - RPT W - WC S - SPT N - Neg cache J - Reject
E - Expanded X - External P - Pending C - Changing
U - Null IIF T - switching D - Delete L - Local
ROUTES for R5
Source/Mask Group/Mask Flags IIF OIFs
------------------ ------------------ ----- -------------- ----
0.0.0.0/0 239.1.1.1/32 W register toR3
136.1.1.100/32 239.1.1.1/32 RSL iserver toR3
R5# multicast show mfc
Source Address Group Address Incoming I/f Outgoing I/f Exit Ports
-------------- ------------- ------------ ------------ ----------
136.1.1.100 239.1.1.1 iserver toR3 et.2.3
R3# pim show route
PIM Routes:
FLAGS: R - RPT W - WC S - SPT N - Neg cache J - Reject
E - Expanded X - External P - Pending C - Changing
U - Null IIF T - switching D - Delete L - Local
ROUTES for R3
Source/Mask Group/Mask Flags IIF OIFs
------------------ ------------------ ----- -------------- ----
0.0.0.0/0 239.1.1.1/32 W toR5 musers
136.1.1.100/32 239.1.1.1/32 S toR5 musers
R3# multicast show mfc
Source Address Group Address Incoming I/f Outgoing I/f Exit Ports
-------------- ------------- ------------ ------------ ----------
136.1.1.100 239.1.1.1 toR5 musers et.2.8