support required for inter VLAN routing

We have configured the the DEll 3024 switch as a core (with stack) , and four  2048 connected to the core as a access switch ,

 i able to ping from all the vlan client to other vlan gateway  , but client to client reachability not happening from the different VLANs .So kindly see the below core configuration and need someone  help to sort out  the issue .

!Current Configuration:
!System Description "Dell Networking N3024P, 6.2.6.6, Linux 3.6.5-50bbccb7"
!System Software Version 6.2.6.6
!
configure
vlan 6,10,20,30
exit
vlan 6
name "Servers"
exit
vlan 10
name "Finanace"
exit
vlan 20
name "HR"
exit
vlan 30
name "ISCSI"
exit
hostname "Core_ISCSI_SW"
slot 1/0 6 ! Dell Networking N3024P
slot 2/0 6 ! Dell Networking N3024P
stack
member 1 3 ! N3024P
member 2 3 ! N3024P
exit
interface out-of-band
ip address 192.168.100.1 255.255.255.0 0.0.0.0
exit
system jumbo mtu 9216

ip routing

service dhcp
interface vlan 1
ip address 192.168.10.1 255.255.255.0
exit
interface vlan 6
ip address 192.168.6.100 255.255.255.0
exit
interface vlan 10
ip address 10.10.0.1 255.255.0.0
exit
interface vlan 20
ip address 10.20.0.1 255.255.0.0
exit
ip route 0.0.0.0 0.0.0.0 192.168.6.1
username "admin" password 722f32adbc8b0cc9ddd08c064d11eb56 privilege 15 encrypted
!
interface Gi1/0/1
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/2
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/3
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/4
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/5
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/6
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/7
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/8
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/9
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/10
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/11
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/12
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/13
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/14
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/15
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/16
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/17
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/18
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/19
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/20
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/21
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/22
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/23
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi1/0/24
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/1
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/2
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/3
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/4
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/5
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/6
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/7
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/8
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/9
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/10
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/11
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/12
spanning-tree portfast
switchport access vlan 6
exit
!
interface Gi2/0/13
spanning-tree portfast
exit
!
interface Gi2/0/14
spanning-tree portfast
exit
!
interface Gi2/0/15
spanning-tree portfast
exit
!
interface Gi2/0/16
spanning-tree portfast
exit
!
interface Gi2/0/17
spanning-tree portfast
exit
!
interface Gi2/0/18
spanning-tree portfast
exit
!
interface Gi2/0/19
spanning-tree portfast
exit
!
interface Gi2/0/20
spanning-tree portfast
exit
!
interface Gi2/0/21
switchport mode trunk
exit
!
interface Gi2/0/22
switchport mode trunk
exit
!
interface Gi2/0/23
switchport mode trunk
exit
!
interface Gi2/0/24
switchport mode trunk
exit
snmp-server engineid local 800002a20364006aeae459
enable password 722f32adbc8b0cc9ddd08c064d11eb56 encrypted
exit

Thank you 

.