Enterasys N Standalone (NSA) Series Configuration Manual page 971

Table 12-6 show ip pim neighbor Output Details (Continued)
Output
Expires
Mode
(DR)
What It Displays...
Interval in hours, minutes, and seconds until the entry will
be removed from the IP multicast routing table.
Mode in which the interface is operating.
Indicates that this neighbor is a designated router on the
LAN.
Matrix NSA Series Configuration Guide
IP Configuration Command Set
Configuring PIM
12-59