VLAN tagging across a Layer 3 hop

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Jan 22nd, 2008
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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).

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Jon Marshall Tue, 01/22/2008 - 09:48
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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 Tue, 02/12/2008 - 01:22
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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

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