Command Reference Guide

46 ● display multicast routing-table 3Com Router 5000 Family and Router 6000 Family
Command Reference
Description This command displays the multicast routing table information, while the display
multicast forwarding-table command displays the multicast forwarding table
information.
The entry (S, G) in the multicast routing table, i.e., (multicast source, multicast group)
acts as the independent entry in the table. Each entry has a unique Upstream,
indicating the interface through which RPF goes to the multicast source. Each entry
has also a Downstream List, indicating which interfaces need multicast forwarding.
The related information about (S, G) includes:
proto: the multicast protocol number which possesses the (S, G) (in hexadecimal
notation format).
Flags: all kinds of flags, such as RPT 0x1, WC 0x2, SPT 0x4, NEG CACHE 0x8 and JOIN
SUPP 0x10. All the flags are marked by binary “bit”. In which, RPT indicates the (S, G)
is in the shared tree status. WC is the abbreviation of wildcard. SPT indicates the
shortest path tree. NEG CACHE indicates the cache record that the downstream
interface list is null. JOIN SUPP indicates the prune suppression status.