I believe that the VRF-lite function is very limited on the 3550. You might also be limited on which ports of the 3550 will handle the tag-switching. Can you create an rd, then an SVI and apply ip vrf-forwarding to it?
I personally haven't used VRF-Lite with 3550, but I've used it on Cat 4948, 4500, and 6500. Try to see if "address-family" command is available under the EIGRP process.
router eigrp 100
address-family ipv4 vrf
Please note that some commands are only available globally, but not under "address-family". One example is "passive-interface".
Also note that you'd obviously have to create the VRF first under global config mode before you can enable VRF-Lite in EIGRP, plus at least one of your Layer-3 interfaces will have to be associated to the VRF (either SVI or routed port).
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