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can not able to ping router ip using cisco layer 3 switch

Hello,

router ip 192.168.9.1 directally connceted to 192.168.9.254 (fa0/1 of layer 3 switch).

vlan ip 172.16.30.254/23

i can able to ping 192.168.9.1 if my source is 192.168.9.254 (fa0/1 of layer 3 switch)

i am not able to ping 192.168.9.1 from switch if source is 172.16.30.254

you can see runnig and ip route configuration

Switch#show ip route

Gateway of last resort is not set

C    192.168.9.0/24 is directly connected, FastEthernet0/1

     172.16.0.0/23 is subnetted, 1 subnets

C       172.16.30.0 is directly connected, Vlan30

Switch#show run

Building configuration...

Current configuration : 2262 bytes

!

version 12.2

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname Switch

!

boot-start-marker

boot-end-marker

!

!

no aaa new-model

system mtu routing 1500

ip subnet-zero

ip routing

!

!

!

!

!

!

!

!

!

!

spanning-tree mode pvst

spanning-tree etherchannel guard misconfig

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

!

!

interface FastEthernet0/1

no switchport

ip address 192.168.9.254 255.255.255.0

!

interface FastEthernet0/2

!

interface FastEthernet0/3

!

interface FastEthernet0/4

!

interface FastEthernet0/5

!

interface FastEthernet0/6

!

interface FastEthernet0/7

!

interface FastEthernet0/8

!

interface FastEthernet0/9

!

interface FastEthernet0/10

!

interface FastEthernet0/11

!

interface FastEthernet0/12

!

interface FastEthernet0/13

!

interface FastEthernet0/14

!

interface FastEthernet0/15

!

interface FastEthernet0/16

!

interface FastEthernet0/17

!

interface FastEthernet0/18

!

interface FastEthernet0/19

!

interface FastEthernet0/20

!

interface FastEthernet0/21

!

interface FastEthernet0/22

!

interface FastEthernet0/23

!

interface FastEthernet0/24

!

interface FastEthernet0/25

!

interface FastEthernet0/26

!

interface FastEthernet0/27

!

interface FastEthernet0/28

!

interface FastEthernet0/29

!

interface FastEthernet0/30

!

interface FastEthernet0/31

!

interface FastEthernet0/32

!

interface FastEthernet0/33

!

interface FastEthernet0/34

!

interface FastEthernet0/35

!

interface FastEthernet0/36

!

interface FastEthernet0/37

!

interface FastEthernet0/38

!

interface FastEthernet0/39

!

interface FastEthernet0/40

!

interface FastEthernet0/41

!

interface FastEthernet0/42

!

interface FastEthernet0/43

!

interface FastEthernet0/44

!

interface FastEthernet0/45

!

interface FastEthernet0/46

!

interface FastEthernet0/47

!

interface FastEthernet0/48

switchport access vlan 30

switchport mode access

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface GigabitEthernet0/3

!

interface GigabitEthernet0/4

!

interface Vlan1

ip address 172.16.4.31 255.255.248.0

!

interface Vlan30

ip address 172.16.30.254 255.255.254.0

!

ip classless

ip http server

ip http secure-server

!

!

control-plane

!

!

line con 0

line vty 5 15

!

end

Switch#

upour help is highly appreciated.

1 REPLY 1
Hall of Fame Expert

Re: can not able to ping router ip using cisco layer 3 switch

Hello Dipak,

the router needs a static route for network 172.16.30.0/23 in order to answer to ICMP request sourced by 192.168.30.254

on the router

config t

ip route 172.16.30.0 255.255.254.0 192.168.9.254

exit

wr mem

This should fix your issue, to be noted it is not the switch the one that needs a configuration change.

Hope to help

Giuseppe

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