[c-nsp] 'show ip arp' intended functionality

[Drew Weaver]

Oh sorry I should've been more specific.

On Dell OS10E and NX-OS:

In the case of
Vlan 145
Int vlan 145
Ip address 10.1.0.1/29

sh ip arp vlan 145 only shows 10.1.0.2, 10.1.0.3 but never the router's own ip/MAC address in the arp table.

I was just trying to determine whether the 'right way' is how it used to work (where it showed the router's own IP/mac in the arp table) or if the right way is how it is done now.

Thanks,
-Drew

-----Original Message-----
From: Gustaf Hyllested Servé <gustaf at serve.dk> 
Sent: Thursday, October 28, 2021 9:15 AM
To: Drew Weaver <drew.weaver at thenap.com>; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 'show ip arp' intended functionality

Show ip arp, returns the learned (or configured) mappings between MAC-addresses and IP-addresses that the network-stack communicates with. So a layer2 switch probably only show it's default gateway and other devices that the management-plane have communicated with. A local router (or "layer 3 switch") will at most times have all (active) devices on the networks it serves in its arp-table. 

Gustaf Hyllested Serve