VLAN tagging across a Layer 3 hop

admin_2 · ‎01-22-2008

Core: 6K, Sup720

Edge: 3560G 24

Core to Edge: Fiber, L3 hop running EIGRP

I am wondering if it is possible to tag vlan traffic going across the L3 int so that when the packets arrive at the core, they are tagged for vlan 100. I really don't want to change my network to a flat L2 (too many nodes).

Jon Marshall · ‎01-22-2008

Hi

To tag the packets the uplink would need to be a layer 2 trunk which it isn't. You can however extend a Layer 2 vlan across a routed link - have a look at the following

http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00801a756b.html

HTH

Jon

l.mourits · ‎02-12-2008

Look at the closed user group setup (using gre, vrf and 802.1q ). That's the only thing I can think of.

http://www.cisco.com/en/US/solutions/ns340/ns414/ns742/ns656/net_design_guidance0900aecd804ab672.pdf

You might need to provide more specifics of your current setup to get better answers (not from me BTW, I'm not the nr. 1 expert on this topic)

HTH,

Leo