i'm not able to ping point to point, hence config is all OK.

[noob_route]

When i try to Ping fron internal router (192.168.40.2/24)to Layer-3 switch(192.168.40.1/24) same subnet ip address, it's not pinging.

NOTE: topology is attached below

Configuration:

INTERNAL ROUTER

redundancy
!
!
ip tcp synwait-time 5
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.40.2 255.255.255.0
duplex auto
speed auto
!
!
interface FastEthernet0/1
ip address 192.168.50.1 255.255.255.0
duplex auto
speed auto
!
!
interface FastEthernet1/0
no ip address
shutdown
duplex auto
speed auto
!
!
interface FastEthernet1/1
no ip address
shutdown
duplex auto
speed auto
!
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
ip route 0.0.0.0 0.0.0.0 192.168.40.1
!
nls resp-timeout 1
cpd cr-id 1
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
mgcp fax t38 ecm
mgcp behavior g729-variants static-pt
!
!
!
gatekeeper
shutdown
!

L3-SW

!
!
!
!
!
!
!
!
vtp file nvram:vlan.dat

!
!
ip tcp synwait-time 5
!
!
!
!
!
interface FastEthernet1/0
switchport access vlan 10
duplex full
speed 100
!
interface FastEthernet1/1
switchport access vlan 10
duplex full
speed 100
!
interface FastEthernet1/2
no switchport
ip address 192.168.40.1 255.255.255.0
duplex full
speed 100
!
interface FastEthernet1/3
duplex full
speed 100
!
interface FastEthernet1/4
duplex full
speed 100
!
interface FastEthernet1/5
duplex full
speed 100
!
interface FastEthernet1/6
duplex full
speed 100
!
interface FastEthernet1/7
duplex full
speed 100
!
interface FastEthernet1/8
duplex full
speed 100
!
interface FastEthernet1/9
duplex full
speed 100
!
interface FastEthernet1/10
duplex full
speed 100
!
interface FastEthernet1/11
duplex full
speed 100
!
interface FastEthernet1/12
duplex full
speed 100
!
interface FastEthernet1/13
duplex full
speed 100
!
interface FastEthernet1/14
duplex full
speed 100
!
interface FastEthernet1/15
no switchport
no ip address
duplex full
speed 100
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
ip address 192.168.10.3 255.255.255.0
!
interface Vlan200
ip address 192.168.30.2 255.255.255.0
!
no ip http server
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 192.168.10.5
ip route 3.3.3.0 255.255.255.0 192.168.30.1
ip route 192.168.50.0 255.255.255.0 192.168.40.2
!
!
no cdp log mismatch duplex
!
!
!
control-plane
!
!
!
!
!
!
!

[balaji.bandi]

if the interface up from both the side from Router to Layer 3 switch able to ping.

i would suggest unknow network send to Internet, specific to respected gateways

L3-SW  ( make sure ip routing enabled)

ip route 0.0.0.0 0.0.0.0 192.168.40.1

Can you post below output

show interface FastEthernet1/2

show interface FastEthernet0/0

show ip route

show ip interface brief.

[paul driver]

Hello

Try:
interface FastEthernet1/2
duplex auto
speed auto

[noob_route]

I didn't do anything, just closed the gns3 and reopend, now it's pinging.
but got new problem, when i try to ping from L3-sw to 192.168.30.1/24 its showing : 

Sending 5, 100-byte ICMP Echos to 192.168.30.1, timeout is 2 seconds:
UUUUU
Success rate is 0 percent (0/5)

NOTE: topology is attached below

[paul driver]

Hello

---

@noob_route wrote:

when i try to ping from L3-sw to 192.168.30.1/24 its showing : 

Sending 5, 100-byte ICMP Echos to 192.168.30.1, timeout is 2 seconds:
UUUUU
Success rate is 0 percent (0/5)

---

Looks like external 192.168.30.1 doesn't know how to reach the internal router.

External router
sh ip route
sh ip int brief

[noob_route]

EXTERNAL ROUTER:

#sh ip route

3.0.0.0/24 is subnetted, 1 subnets
S 3.3.3.0 [1/0] via 10.10.10.1
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.10.10.0/24 is directly connected, FastEthernet0/0
L 10.10.10.2/32 is directly connected, FastEthernet0/0
192.168.30.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.30.0/24 is directly connected, FastEthernet0/1
L 192.168.30.1/32 is directly connected, FastEthernet0/1
S 192.168.40.0/24 [1/0] via 192.168.30.2

#sh ip int br

Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.10.10.2 YES NVRAM up up
FastEthernet0/1 192.168.30.1 YES NVRAM up up
FastEthernet1/0 unassigned YES NVRAM administratively down down
FastEthernet1/1 unassigned YES NVRAM administratively down down

[balaji.bandi]

still we need below output :

show ip route

show ip interface brief.

[Georg Pauwen]

Hello,

the problem is that you are trying to connect a physical interface to an SVI. You have three options to make this work (I used physical interfaces GigabitEthernet0/0 in the examples, yours might be different);

Option 1

External Router

interface GigabitEthernet0/0
description Link to L3 Switch
ip address 192.168.30.1 255.255.255.0

L3 Switch

interface GigabitEthernet0/0
description Link to External Router
switchport mode access
switchport access vlan 200
!
interface Vlan 200
ip address 192.168.30.2 255.255.255.0

Option 2

External Router

interface GigabitEthernet0/0
description Link to L3 Switch
ip address 192.168.30.1 255.255.255.0

L3 Switch

interface GigabitEthernet0/0
description Link to External Router
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk native vlan 200
!
interface Vlan 200
ip address 192.168.30.2 255.255.255.0

Option 3

External Router

interface GigabitEthernet0/0.200
description Link to L3 Switch
encapsulation dot1q 200
ip address 192.168.30.1 255.255.255.0

L3 Switch

interface GigabitEthernet0/0
description Link to External Router
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Vlan 200
ip address 192.168.30.2 255.255.255.0

[MHM Cisco World]

L3 for L3SW need to config 
ip routing in global to turn on the L3 of L3SW and hence L3SW can use the routing table.