Bay Networks 6300 Supplement Manual page 416

Chapter 1 Network Administration Book B
The CLI hosts command displays all entries in the host table. The
RA 6300 can build and update the host table from RWHO messages and
from responses to DNS and/or IEN-116 queries. Entries are updated
according to information received. Information for a host will be updated
if new information received is different from what is currently in the host
table. The RA 6300 considers information from a DNS server the most
reliable source; it considers an IEN-116 as the next reliable source; and
it considers RWHO broadcasts as the least reliable source. Thus,
information from a DNS server always updates current information
received from either an IEN-116 server or an RWHO broadcast;
information from an IEN-116 server always updates current information
received from an RWHO broadcast.
The RA 6300 also deletes entries. The criteria for deletion depend on the
source of the entry. Each DNS response includes a time to live (TTL).
When an entry reaches its full life (default=60 minutes), the DNS server
is queried again. If a DNS server recognizes the name, the entry is re-
entered in the host table; otherwise, it is deleted. The RA 6300 keeps
track of how often each IEN-116 host table entry is referenced. If a name
server entry has not been used for 32 days, it is deleted.
The RA 6300 expects to receive an RWHO message from a host at least
every six minutes; if no message is received in that time period, the host
table status entry for that host is changed to down?. If there is no message
for 12 minutes, the status is changed to down, and if no message is
received for 60 minutes, the entry is removed from the table.
Remote Annex 6300 Supplement to the Remote Annex Administrator's Guide for UNIX
B-50