Layer3 capable Cisco device without a mapping to a more specific class fall
under the Layer3::Cisco class. These can be "real" routers that don't need
community based indexing, or Layer 3 switches that do need community based
indexing (to fetch L2 forwarding tables for different VLANs). Generally, if
community based indexing is needed on a platform, it also supports the
CISCO-VTP-MIB. Dynamically return cisco_comm_indexing based on vtpVersion.
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