Switch is up and running but not pingable from router

Unanswered Question
Jun 6th, 2008

hi all,

i am unable to ping or telnet the switch

from router which is directly connected to switch

users are conencted to switch and they can work fine.

I have this problem too.
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Jon Marshall Fri, 06/06/2008 - 09:08


Is there a L3 SVI on the switch and is it up/up ie. on the 3750

3750# sh ip int brief

Is the port that connects the switch to the router in the same vlan.

It might be a good idea if you could post the configs or at very least supply full IP details.


mahesh18 Fri, 06/06/2008 - 09:21

Hi john

i do not have access to switch right now.

it is WS-C2948 switch connected to router


this is arp from router

sh ip arp

Protocol Address Age (min) Hardware Addr Type Interface

Internet 71 001a.8054.2529 ARPA FastEthernet0

husycisco Fri, 06/06/2008 - 09:08

Hi Mahesh

Connect your switch via console and make sure you have assigned an IP to your native VLAN (it is usually vlan 1). For telnet, check your line vty settings in switch


Richard Burts Fri, 06/06/2008 - 09:36


I am not sure which is a typo, but there is a mismatch in the first octet of the address that you seem to be looking for and the address in the results from the router:

sh ip arp

Protocol Address Age (min) Hardware Addr Type Interface

Internet 71 001a.8054.2529 ARPA FastEthernet0

Is the first octet supposed to be 33 or 43?

Correct whichever is not correct.



mahesh18 Fri, 06/06/2008 - 09:53

Hi rick,

it might be my typing mistake when i put

pasted note here in forum

whitbych1 Fri, 06/06/2008 - 10:57

If you are trying to access any of the vty sessions on the switch via a network connection you may want to plug in console and make sure you don't have an ACL blocking your incoming connections. As well as ensure that the ip address is specified with the correct IP address and subnet mask on interface vlan 1. And make sure you have performed a no shut command on int vlan 1

m_zabetian Fri, 06/06/2008 - 11:35

try to sh cdp ne de on router to see if switch connected to router or not, also you can see ip address of switch, then check to see you have password for you VTY and also check ip default-gateway configuration in switch

mahesh18 Fri, 06/06/2008 - 12:19


switchis accessible now.

logs are clean no idea why it was not accessible for certain time


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