Show arp issue in 2960X
Hi All,
Our office network setup is ISP-------ASA---------3750---------2960X (stack by 4)-----------wired users
Recently, I use command "show arp" in 2960X, the output as below,
In arp table, I can't see wired PC mac address, and also I do a test at last,
I filter my PC using my wired PC IP address (10.27.82.72), but no result in output.
I just want to know what reason cause this issue?
What should I to do that can solve this problem?
Thanks in advance,
swt001#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.25.2.222 172 0017.e048.de41 ARPA Vlan48
Internet 10.25.3.200 160 0017.e048.de41 ARPA Vlan48
Internet 10.25.31.25 236 0017.e048.de41 ARPA Vlan48
Internet 10.25.47.33 131 0017.e048.de41 ARPA Vlan48
Internet 10.25.48.50 256 0017.e048.de41 ARPA Vlan48
Internet 10.25.48.51 163 0017.e048.de41 ARPA Vlan48
Internet 10.27.36.101 46 0017.e048.de41 ARPA Vlan48
Internet 10.27.47.25 162 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.5 236 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.8 221 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.15 30 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.20 191 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.21 209 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.24 212 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.37 128 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.43 140 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.49 186 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.61 12 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.63 229 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.64 22 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.69 245 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.75 63 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.91 80 0017.e048.de41 ARPA Vlan48
Internet 10.27.82.203 178 0017.e048.de41 ARPA Vlan48
Internet 10.27.95.61 - 2834.a26d.62c1 ARPA Vlan48
Internet 192.168.1.1 - 2834.a26d.62c2 ARPA Vlan99
swt001#
swt001#sh arp | in 10.27.82.72
swt001#
Tracing a MAC address is fairly straight forward.
#show mac-address-table 0017.e048.de41
It may also be
#show mac address-table 0017.e048.de41
This will list the Outgoing interface that the switch will use to forward frames destined for that MAC address. It does not automatically mean that interface HAS that MAC because it could be a trunk port.
If the outgoing interface turns out to be a Trunk port, logon to the switch connected to that link and check its MAC table in the same way. Keep going until you reach the interface which has the MAC address you are looking for. It could be a virtual interface on a Switch/Router (SVI or Loopback), a Layer 3 address on a Router (i.e one with an IP address) or a normal host port.
Hope that helps
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