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Forum Discussion
Vlan trunking using vlan tagging
Hi ,
Refering to the attached image, I have a setup of 2 switches whereby they are join together by vlan tagging of 21,22,52&53.
I have 2 GWs, GW1 and GW3 respectively which is also connected to switch by Vlan tagging of the same.
The goal is that GW1 and GW3 can talk across 2 switches.
My problem is this doesn't work.
When I port mirror at either switch, I can see the arp request from the opposite site. For example, if I were to ping 10.255.255.1 to 10.255.255.2, I could observed the ingress arp request from 10.255.255.1 requesting 10.255.255.2, on the vlan trunk link. but it just doesn't propagate to the vlan 52 ports, either to the ISP GW or the GW1.
If I replace the vlan trunk link with a machine configure the same IP as GW3 with vlan tagging of 52, pinging works.
Why does this is so and how can I make this to work?
5 Replies
Hi DaneA,
There is default route configure for GW3 but not GW1.
Default route does not play a role here since both gateways are having 10.255.255.0/30
there .1 is on GW3 and .2 is ont GW3,
As it is on the same network no routing is require. Thus the purpose of vlan trunking is to make both switches to be the same L2 network for vlan 52.this seems to be related to my problem. Im not seeing how to get traffic out of a switch on a vlan to out the trunk to the rest of the network.
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