ping to router from switch Un-sucessfull ?

Unanswered Question
Jul 14th, 2008

1) configured router with sub-interfaces and assigned vlan's to every sub-interface using dot1q

2)configured switch ports with vlan's and attachd Pc's to every vlan.

3)pc's from all vlan can ping all the subinterface and other vlans's.

4)I can't ping the router sub-interfaces from the switch

do we have to configure any more on switch or router to make switch ping all the router sub-interfaces?

I have this problem too.
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Richard Burts Mon, 07/14/2008 - 04:31


It might be helpful to know what model of switch you are talking about.

The list of things that you did does not include configuring a management interface and IP address on the switch. If the switch does not have a management interface with an IP address it will not be able to ping the router.



gpulos Mon, 07/14/2008 - 05:02

In order to have your switch ping the router sub-interfaces, you'll have to enable IP routing on the switch (if it is capable) and either:

a: put an IP Address on the switch that belongs in a VLAN directly connected to the router of the same subnet, or

b: create an SVI (switched virtual interface) on the switch that will allow your switch to participate in routing so it can communicate with other VLANs.

Please see the following link for a good example and more info on configuring interVLAN routing on your switch:

(this link is for 37xx/36xx/35xx switches but the concept is the same for all SVI capable switches)

(your switch model may not support IP routing so please verify. EMI version IOS on your switch supports IP routing if your switch has it.)

Richard Burts Mon, 07/14/2008 - 06:54

Kiran has posted this same question in at least 3 forums. The discussion in the WAN Routing and Switching forum has been the most extensive and has included posting of configs, which I believe do show that the problem was a combination of failure to configure a management address in VLAN 1 (and this appears to be a purely layer 2 switch) and a failure to configure an IP address for VLAN 1 on the router.

I suggest that any further discussion be consolidated in the WAN forum.




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