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How to choose scan ip for scan listener?

LonionOct 24 2013 — edited Oct 31 2013

Background Description:

Assume

I have a 11gR2 RAC with 3 nodes. If I configure 4 scan ip resolved by DNS, which three scan ip would be choosen for scan listener? Does it like below?

4 scan ip in DNS server:

192.168.2.101

192.168.2.102

192.168.2.103

192.168.2.104

The scan listener's ip may be like below:

node1

[grid@rac1 ~]$ lsnrctl status listener_scan1

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.101)(PORT=1521)))

node2

[grid@rac2 ~]$ lsnrctl status listener_scan2

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN2)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.102)(PORT=1521)))

node3

[grid@rac3 ~]$ lsnrctl status listener_scan3

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN3)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.103)(PORT=1521)))

But it also can be choosen like below

node1

[grid@rac1 ~]$ lsnrctl status listener_scan1

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.103)(PORT=1521)))

node2

[grid@rac2 ~]$ lsnrctl status listener_scan2

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN2)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.102)(PORT=1521)))

node3

[grid@rac3 ~]$ lsnrctl status listener_scan3

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN3)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.104)(PORT=1521)))

and so on .

Above is my guess, so what's the real combination of three ip ?

Pls help me.

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Locked on Nov 28 2013
Added on Oct 24 2013
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