Since the Router is a Layer 3 device it can see more of the OSI model data

The Router ARP Table

Layer 3

E8-08-88-CB-3F-B4

44-AB-5F-DF-C1-FB

00-1B-63-B4-45-C6

0F-99-3E-A6-2F-01

170.170.10.10

170.170.10.11

170.170.10.12

170.170.10.13

EF-0E-82-C2-34-44

4E-AC-5A-D2-C1-2B

0D-1D-6D-B2-42-46

0C-9A-AE-36-5F-A1

170.170.11.10

170.170.11.11

170.170.11.12

170.170.11.13

Layer 1

Layer 2

Layer 3

Layer 4

Layer 5

Layer 6

Layer 7

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IP addresses are on layer 3, this is why the router can see them but the switch cannot