Why not use CiscoWorks LMS Campus Manager's "Path Analysis" tool"?
It does a simultaneous L2/L3 trace, lays out the results graphically in a single display and provides a tabular representation of you need to export for external analysis.
Here is an excerpt from the help file:
Overview: Layer 2 Path Analysis
The Layer 2 path is the physical path on the network that packets follow through Cisco devices. Path Analysis cannot always determine the Layer 2 path for every Layer 3 hop.
The Layer 2 path includes devices that are either Simple Network Management Protocol (SNMP) accessible and known through Topology Services, or are SNMP inaccessible but have been discovered by User Tracking (for example, end-user hosts).
The Layer 2 path provides further resolution of the Layer 3 path, but is not necessarily a complete representation of all Layer 2 devices. For example, hubs or other devices that do not support the Cisco Discovery Protocol (CDP) do not appear in Layer 2 traces.
Path Analysis uses Asynchronous Network Interface (ANI) information to build Layer 2 paths, combining:
Network topology information
Virtual LAN (VLAN) and Emulated LAN (ELAN) information
User and host information
Current LAN spanning tree configuration
Path Analysis supports Layer 2 tracing on Ethernet, Fast Ethernet, Gigabit Ethernet, and LAN Emulation (LANE) networks. LANE support includes tracing on the path inside an ATM cloud. For this release, Path Analysis Layer 2 tracing does not support FDDI, Token Ring, and WAN interfaces, or router bridge groups.
