Intervlan Routing Issue

Unanswered Question
Apr 6th, 2009

Hi Experts

I have 3750 Series swicth and 2950.

Problem: My Problenm is that i could communicate between same VLAN and even with diffrent Vlans after doing the following configuration.i have attached my configuration.

3750 Configuration:

1. I had configured the 3750 with VLAN 2,3,4,5,6 i have configured VLAN 6 as my Management Vlan.

2. I have enable the routing in 3750.

3. I have made enable the switch trunk encapsulate dot1q.

Switch 2950:

1. I have assigned diffrent port with diffrent Vlans.

I have this problem too.
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Giuseppe Larosa Mon, 04/06/2009 - 02:48

Hello Chamakura,

your configurations look like correct, inter-vlan routing is performed by C3750, packets can go up and down the trunk uplink in different vlans.

Verify that all vlans are defined at layer2 on both switches if you are not using vtp.

Hope to help


chamakura.kiran Mon, 04/06/2009 - 03:10

I have configured the VTP on 3750 and on 2950

VTP MODE Server on 3750

VTP Domain cisco

VTP MODE Client on 2950

VTP Domain Ciso

i could see all my configured VLAN on both the switch,where as i could not communicate detween 2 diffrent vlans and between same vlans

can you please help me.

Giuseppe Larosa Mon, 04/06/2009 - 03:26

Hello Chamakura,

I see there is a more active thread on this on the WAN forum

Let's go on there

Hope to help

Giuseppe Mon, 04/06/2009 - 03:54

Hi Chamakura,

Look like your configuration is fine, just do the following:

#1 On 2950 Switch Prompt, do ping all VLAN IP Address

VLAN 2 -

VLAN 3 -

VLAN 4 -

VLAN 5 -

Just add (VLAN 3) network in your RIP protocol if you want it to advertise.

#2 If ping is not successful, please double check your config, if ping is successful, proceed to #3

#3. On 2950-Switch - VLAN 2, all PC/devices connected to this switch must used ip address belong to (VLAN 2 - I said these because all port of this switch is member of VLAN 2) with a default gateway of (VLAN 2 IP Address). Same goes to other devices connected to other VLAN.


chamakura.kiran Mon, 04/06/2009 - 04:12

yes i have done all according to you said,where as i can

ping from Computer A to Computer B

where as i could not ping from Computer-B to Computer A


Kiran Kumar CH

MKCHAURASIA Mon, 04/06/2009 - 07:16


try this turn off the windows firewall on both the PC and check pings again


-Manish. Mon, 04/06/2009 - 07:26

Hi Kiran,

Hmm, I'm just wondering if you already check your Computer-A for any installed firewall software. Might be a firewall feature in ur Computer-A preventing Computer-B to establish a ping.



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