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not output on the show arp command

Posted on 2016-10-24
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Last Modified: 2016-11-08
From my layer 3 Cisco switch, I could ping 10.10.10.1 but when I did show arp, I could see a lot IP addresses, except my 10.10.10.1. Why is that? Thanks
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Question by:leblanc
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by:Antzs
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Is it on a different network segment separated by ACL or a Firewall?
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by:leblanc
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Even though it is on a different segment, I should still see it in the ARP table, shouldn't I?
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gheist earned 250 total points
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Nope.
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by:Antzs
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by:Craig Beck
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ARP is a layer-2 protocol.  If you ping an address that's on a different subnet you won't see the MAC address of the device.  You'll only see MAC addresses of devices on your layer-2 segment.
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