How does a switch learn its route

Hi
I have a cisco switch and somehow it finds the best route through different routers, I tested this with traceroute from the switch. How does the switch learn these routes?
Thanks
Dan

Hi Rick
Thanks for the info. My switch is a 3500 layer 2 switch. Here's the config for my switch:
Current configuration:
! Last configuration change at 16:04:28 GMT Wed Mar 15 2006
! NVRAM config last updated at 09:49:35 GMT Wed Apr 27 2005
version 12.0
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
hostname switch1
enable secret 5 ttttttttttt
clock timezone GMT 1
ip subnet-zero
ip name-server 10.11.10.2
ip name-server 10.11.10.1
cluster enable l3 0
cluster member 1 mac-address 0007.ebc9.9380
cluster member 2 mac-address 0007.ebc9.94c0
cluster member 3 mac-address 0007.853f.6d00
interface FastEthernet0/1
switchport access vlan 102
interface FastEthernet0/2
duplex full
speed 100
port monitor FastEthernet0/8
switchport access vlan 110
interface FastEthernet0/3
switchport access vlan 102
interface FastEthernet0/4
switchport access vlan 102
interface FastEthernet0/5
port monitor FastEthernet0/19
port monitor FastEthernet0/22
switchport access vlan 100
interface FastEthernet0/6
switchport access vlan 101
interface FastEthernet0/7
duplex full
speed 100
switchport access vlan 102
interface FastEthernet0/8
duplex full
speed 100
switchport access vlan 110
interface FastEthernet0/9
duplex full
speed 100
switchport access vlan 102
interface FastEthernet0/10
duplex full
speed 100
switchport access vlan 102
interface FastEthernet0/11
duplex full
speed 100
switchport access vlan 102
interface FastEthernet0/12
switchport access vlan 101
interface FastEthernet0/13
switchport access vlan 102
interface FastEthernet0/14
duplex full
speed 100
port monitor FastEthernet0/23
switchport access vlan 102
interface FastEthernet0/15
duplex full
speed 100
switchport access vlan 102
interface FastEthernet0/16
duplex full
speed 100
switchport access vlan 108
interface FastEthernet0/17
duplex full
speed 100
switchport access vlan 108
interface FastEthernet0/18
duplex full
speed 100
switchport access vlan 102
interface FastEthernet0/19
duplex full
speed 100
switchport access vlan 100
interface FastEthernet0/20
duplex full
speed 100
switchport access vlan 108
switchport trunk encapsulation dot1q
switchport trunk native vlan 108
switchport mode trunk
interface FastEthernet0/21
duplex full
speed 100
port monitor FastEthernet0/7
switchport access vlan 102
interface FastEthernet0/22
switchport access vlan 100
interface FastEthernet0/23
duplex full
speed 100
switchport access vlan 102
no cdp enable
interface FastEthernet0/24
switchport access vlan 102
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 102
switchport mode trunk
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport trunk native vlan 102
switchport mode trunk
interface VLAN1
no ip address
no ip directed-broadcast
ip nat outside
shutdown
interface VLAN102
ip address 10.11.8.21 255.255.248.0
no ip directed-broadcast
ip nat outside
ip nat inside source list 199 interface VLAN102 overload
logging facility local6
logging 10.11.9.21
logging 10.24.21.1
access-list 199 dynamic Cluster-NAT permit ip any any
banner motd ^C
Switch 1
^C
line con 0
password 7 xxxxxxxx
transport input none
stopbits 1
line vty 0 4
exec-timeout 35000 0
password 7 xxxxxxxx
login
line vty 5 15
password 7 xxxxxxxx
login
ntp clock-period 11259714
ntp server 10.11.9.21
end
I haven't got a default gateway, any idea how its finding its route?
Thanks again
Dan

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Some Clarifications
=============
DELETE /*+ ROWID(I) */ FROM INTSFI I WHERE
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FROM PURMAR P WHERE P.NUPUR=1))) AND ROWID>='AAADxyAAWAAHDLIAAB' AND
ROWID<='AAADxyAAWAAHDLIAAH'
Plan hash value: 1677274993
| Id | Operation                      | Name    | Starts | E-Rows | A-Rows |   A-Time   | Buffers | OMem | 1Mem | Used-Mem |
|   0 | DELETE STATEMENT               |         |      1 |        |      0 |00:00:05.94 |   53247 |    |          |          |
|   1 | DELETE                        | INTSFI |      1 |        |      0 |00:00:05.94 |   53247 |    |          |          |
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|   3 |    NESTED LOOPS                |         |      1 |   9226 |      7 |00:00:00.01 |      10 |    |          |          |
|* 4 |     TABLE ACCESS BY ROWID RANGE| INTSFI |      1 |   9226 |      7 |00:00:00.01 |       6 |    |          |          |
|* 5 |     INDEX UNIQUE SCAN          | PURMAR1 |      7 |      1 |      7 |00:00:00.01 |       4 |    |          |          |
|   6 |    INDEX FAST FULL SCAN        | INTSFI1 |      1 |     14M|   7543K|00:00:01.73 |   53170 |    |          |          |
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When I force the NESTED LOOP SEMI JOIN the query runs faster:
DELETE /*+ ROWID(I) */ FROM INTSFI I WHERE
(I.DAVAL<=TO_DATE('12032008','DDMMYYYY') AND (EXISTS(SELECT /*+ NL_SJ
*/ 1 FROM INTSFI S WHERE S.COINT=I.COINT AND S.NUCPT=I.NUCPT AND
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ROWID<='AAADxyAAWAAHDLIAAH'
Plan hash value: 2031485112
| Id | Operation                      | Name    | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
|   0 | DELETE STATEMENT               |         |      1 |        |      0 |00:00:00.01 |      94 |
|   1 | DELETE                        | INTSFI |      1 |        |      0 |00:00:00.01 |      94 |
|   2 |   NESTED LOOPS SEMI            |         |      1 |   9226 |      7 |00:00:00.01 |      27 |
|   3 |    NESTED LOOPS                |         |      1 |   9226 |      7 |00:00:00.01 |       9 |
|* 4 |     TABLE ACCESS BY ROWID RANGE| INTSFI |      1 |   9226 |      7 |00:00:00.01 |       5 |
|* 5 |     INDEX UNIQUE SCAN          | PURMAR1 |      7 |      1 |      7 |00:00:00.01 |       4 |
|* 6 |    INDEX RANGE SCAN            | INTSFI1 |      7 |     14M|      7 |00:00:00.01 |      18 |
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   5 - access("P"."NUPUR"=1 AND "I"."COMAR"="P"."COMAR")
   6 - access("S"."COINT"="I"."COINT" AND "S"."NUCPT"="I"."NUCPT" AND
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       filter(NVL("S"."RGCID",(-1))=NVL("I"."RGCID",(-1)))the above post is from Ahmed AANGOUR
Case 1 - . If you check Plan hash value: 16772749938
=====
TABLE ACCESS BY ROWID RANGE| INTSFI For every row access from INTSFI - it fetches a record from INDEX UNIQUE SCAN | PURMAR1
If we check A-rows = 9226
9226 * 7 = 64582 request across the table - perhaps with hint of rowid it fetches exact rows from PURMAR1
in this case i think going for hash join with ordered hints (jonathan as you suggest go for leading hint's instead of ordered) - from INTSFI - PURMAR1 - instead of going for IN clause would get the rows that satifies the ("P"."NUPUR"=1 AND "I"."COMAR"="P"."COMAR")
|* 2 |   HASH JOIN SEMI               |         |      1 |   9226 |      7 |00:00:05.94 |   53180 |   783K|   783K| 471K (0)|
|   3 |    NESTED LOOPS                |         |      1 |   9226 |      7 |00:00:00.01 |      10 |    |          |          |
|* 4 |     TABLE ACCESS BY ROWID RANGE| INTSFI |      1 |   9226 |      7 |00:00:00.01 |       6 |    |          |          |
|* 5 |     INDEX UNIQUE SCAN          | PURMAR1 |      7 |      1 |      7 |00:00:00.01 |       4 |    |          |          |My understanding with above plan would change to
HASH JOIN
TABLE ACCESS BY ROWID RANGE| INTSFI
INDEX UNIQUE SCAN | PURMAR1
HASH JOIN
INDEX FAST FULL SCAN | INTSFI1
Which migt be feasible.
2 .
DELETE /*+ ROWID(I) */ FROM INTSFI I WHERE
(I.DAVAL<=TO_DATE('12032008','DDMMYYYY') AND (EXISTS(SELECT /*+ NL_SJ
*/ 1 FROM INTSFI S WHERE S.COINT=I.COINT AND S.NUCPT=I.NUCPT AND
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ROWID<='AAADxyAAWAAHDLIAAH'Ahmed AANGOUR, modified the query by /*+ NL_SJ */ hint, Instead of that in to remove the most of the rows as we join the tables using subquery, I still doubt it
to go push_predicate hints - still doubt it.
Jonathan your comments are most valuable in the above two cases..
Looking forward to calrify my understanding with concepts of indexes for above test cases
- Pavan Kumar N

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