Enterasys N Standalone (NSA) Series Configuration Manual page 967

Table 12-4 show ip pim bsr Output Details (Continued)
Output
BSR Hash Mask
Length
BSR Uptime
BSR Expiry
What It Displays...
Length of a mask (32 bits maximum) that is to be added with
the group address before the hash function is called. This
value is configured by the ip pim bsr-candidate command.
Interval that this router has been up (in
hours:minutes:seconds). After 24 hours, format will change
into days:hours and, after a week, will change into
weeks:days.
Period in which the next bootstrap message is due from this
BSR (in hours:minutes:seconds). After 24 hours, format will
change into days:hours and, after a week, will change into
weeks:days. Assigning a time value of 00:00:00 means this
BSR will not expire.
Matrix NSA Series Configuration Guide
IP Configuration Command Set
Configuring PIM
12-55