Can anyone point to me towards information on this listener.ora parameter and the endpoints file? There is no reference in the docs (except for a sample listener.ora file in the RAC Installation Guide, no explanation).
Following a clusterware with gPNP installation, the listener.ora file has only IPC addresses, plus this parameter:
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))) # line added by Agent
LISTENER_SCAN3=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN3)))) # line added by Agent
LISTENER_SCAN2=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN2)))) # line added by Agent
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))) # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN2=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN3=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON # line added by Agent
The endpoints_listener.ora file specifies the fixed and VIP addresses of the public NIC:
LISTENER_GR7244=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=10.196.182.201)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=10.196.180.44)(PORT=1521)(IP=FIRST)))) # line added by Agent
The listener named LISTENER is in fact listening on both its IPC address, and the addresses in the endpoints_listener.ora file:
[grid@gr7244 admin]$ lsnrctl status listener
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 02-APR-2010 04:52:02
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 01-APR-2010 10:44:19
Uptime 0 days 18 hr. 7 min. 42 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File /u01/app/grid/diag/tnslsnr/gr7244/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.196.180.44)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.196.182.201)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
The command completed successfully
[grid@gr7244 admin]$
The scan listener on this node is listening on its IPC address, and its VIP:
[grid@gr7244 admin]$ lsnrctl status listener_scan3
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 02-APR-2010 04:46:15
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN3)))
STATUS of the LISTENER
------------------------
Alias LISTENER_SCAN3
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 31-MAR-2010 12:10:27
Uptime 1 days 16 hr. 35 min. 48 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File /u01/app/grid/diag/tnslsnr/gr7244/listener_scan3/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN3)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.196.182.200)(PORT=1521)))
Services Summary...
Service "jwha" has 1 instance(s).
Instance "orcl3", status READY, has 1 handler(s) for this service...
Service "jwserv" has 1 instance(s).
Instance "orcl3", status READY, has 1 handler(s) for this service...
Service "orcl" has 3 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
Instance "orcl2", status READY, has 1 handler(s) for this service...
Instance "orcl3", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 3 instance(s).
Instance "orcl1", status READY, has 1 handler(s) for this service...
Instance "orcl2", status READY, has 1 handler(s) for this service...
Instance "orcl3", status READY, has 1 handler(s) for this service...
The command completed successfully
[grid@gr7244 admin]$
I did wonder if this parameter and file could be part of the mechanism whereby a listener discovers the DHCP assigned VIPs on which it has to listen?
] 
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