Vlan/Switching issue

[harpreetparhar]

Hi Guys,

Can you please assist me in resolving my issue.

Ok, here it is:

We have two networks:

1. Test
2. Production

I would like to inject L2 traffic from test network vlan (2and 4) to production network. Please find the attached diagram.

I have created L2 vlans 2 & 4 on production switches 1,2 & 3.

Problem:

My traceroute/communication is going out via production network to telco and coming back to test router. I want this to communicate internally and I have tried null route etc. to block it but no luck. Please note, there is no L3 interface on production switch/router for vlan 2 & 3.

Configuration:

#Test switch#

!

interface FastEthernet0/1

 description connects to production switch

 switchport trunk encapsulation dot1q

 switchport trunk allowed vlan 2,4

 switchport mode trunk

 spanning-tree portfast trunk

end

#6500 Production Switch#

interface GigabitEthernet2/0

 description Connects to test switch

 switchport

 switchport trunk encapsulation dot1q

 switchport trunk allowed vlan 2,4

 switchport mode trunk

 spanning-tree guard root

end

Thank you

[Suresh Vinayagam Subramanian]

Hi ,

We can answer preciously If we have your L3 ip details and traceroute result . 

I assume that you had tried traceroute from one vlan to another vlan. Traffic from one vlan to another vlan  needs to routed . So traffic should hit L3 device where SVI is configured.  I understand from you note that you dont have L3 interface in production router. So obviously traffic will hit test router for routing.

In order to restrict this, you can create SVI on your production router. So routed traffic would be forwarded in production router only .

HTH
Regards,
VS.Suresh.
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