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InterVlan problem using 3750

chamakura.kiran
Level 1
Level 1

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 is 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.

1 Accepted Solution

Accepted Solutions

Hi ,

Have you enabled routing on 3750 switch using command

Once again enable it using...

3750 config )# ip routing.

actually Gig interface of 2950 must allow command switchport trunk encapsulation dot1q ..

Can you send us show vlan output of 3750 and 2950 switch..

and "show interfaces trunk " output and show interface output after connecting laptops in vlan 2

Cheers :) MSK

View solution in original post

16 Replies 16

smothuku
Level 7
Level 7

Hi

Are you able to communicate with same vlan r diff vlan's or not..Your problem is not clear..can you explain it once again

Thanks,

Satish

1. I am not able to communicate from vlan 2 to Valn 3.

2. I am not able to communicate between Valn2 - vlan 2

lamav
Level 8
Level 8

Sorry, but youre not making sense. What is the problem?

smothuku
Level 7
Level 7

Hi ,

As per my understanding there is no communication between same vlan and diff vlan..configured on 3750 switch.

1) create vlan database on the siwtches before craeting layer 3 vlans..

2) check the vlan database using command show vlan..

whatever vlans created on switch must be shown after executing command "show vlan " command..

Please check the below url for better idea...

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00801cc828.shtml

How the switches are connected whoch ports are the uplink ports..

Can you send us show vlan output of both the switches..show trunk also

What is the uplink port on 2950 switch...

Cheers :)

MSK

1. How the switches are connected whoch ports are the uplink ports.

3750 is connected to 2950 using the following ports and they are the trunk porta

Fastethernet1/0/2-----giga0/1

presently i donthave any uplink to ISP

2. Can you send us show vlan output of both the switches..show trunk also.

I have attached the output of sh vlan and sh interface status.

3. Gigabit0/1

Hi ,

By seeing the output of show interfaces we can tell that no pc is conncted on any vlan...

You need to connect the laptop in respective ports so that vlan comesup..

Check the show vlan output...and how are you telling that there is no communication between vlan's..

and one more think is

int gig0/1

switchport trunk encapsulation dot1q

Must be configured on 2950 switch.

Take two laptops (give the ip's in vlan 2 range) and place them in Vlan 2 on 3750 and 2950 switch and check it works...

Please do the below thing..

3750 :

interface FastEthernet1/0/6

switchport access vlan 2

switchport mode access

Then

PC (192.168.2.251 ) - Int f1/0/6(3750 ) and

PC (192.168.2.252) - Int f0/2 (2950)

Try to ping 192.169.2.252 from 3750 switch..

Cheers :)MSK

I have done what you have asked me to do

which are as follows:

1.

Computer A:

IP: 192.168.2.2

Netmask:255.255.255.0

DEfault Gateway: 192.168.2.254

Computer B:

IP: 192.168.2.3

Netmask:255.255.255.0

DEfault Gateway: 192.168.2.254

when i tryed tp Ping i could not ping From Computer A to B

2. My 2950 Switch is not allowing me to exicute (switchport trunk encapsulation dot1q)

i have exicuted switchport mode trunk insted of (switchport trunk encapsulation dot1q )

Hi ,

Have you enabled routing on 3750 switch using command

Once again enable it using...

3750 config )# ip routing.

actually Gig interface of 2950 must allow command switchport trunk encapsulation dot1q ..

Can you send us show vlan output of 3750 and 2950 switch..

and "show interfaces trunk " output and show interface output after connecting laptops in vlan 2

Cheers :) MSK

1. I have enabled ip routing on 3750

2. Do we need to connect the 3750 to 2950 trunk ports using cross over cable or straight through cable.

3. i have attached the out put of sh vlan on 2950 and 3750.

Hi ,

You have to use cross-over cable..and make sure that windows Firewall is disabled on PC's

Cheers :) MSK

1. I have connected 2950 and 3750 trunk ports with cross over cable.

2. I have diabled Firewall on both Computer A and B

WHERE AS I CAN PING ONLY FROM ONE END NOT FROM BOTH END.

Please help me

Regards

Kiran Kumar CH

I have to ask this ,when you ping are you sure you have the windows firewall "off" on both pc's ?

Grate!!!!!!!!!

when i stoped my Firewal on both PC

1. PC-A is pinging PC-B

2. Where as PC-B is not able to ping PB-A

please help me

Did you create a VTP domain?

Switch-3750 - VTP Server

Switch 2950 - VTP Client

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