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Forum Discussion
ARP Cache Empty Except 1
Before I start, I want to clarify that mine's a GS728TPPv1 (no v#), but that wasn't a choice for the "Associated Products," so I picked GS728TPPv2.
I need to check the ARP Cache table every hour via SNMP. But, there's only a router's MAC/IP Address. It doesn't show any entries for devices connected to this switch. I can see the MAC Addresses in the Address Table, but they're not in the ARP Cache. If I do a Ping from the Maintenance/Troubleshooting menu, it then shows up in the ARP Cache for 20 minutes (default). Though, the devices remain connected. If I ping from other than this switch, I can get a response, but that doesn't populate the ARP Cache. What is needed to keep the ARP Cache populated with current information, like most other switches do, e.g., Cisco?
1 Reply
JBCIG wrote:
I need to check the ARP Cache table every hour via SNMP. But, there's only a router's MAC/IP Address. It doesn't show any entries for devices connected to this switch. I can see the MAC Addresses in the Address Table, but they're not in the ARP Cache.
The ARP table is only populated where and when required - on a L2 switch if there is an IPv4 access to the router, on a L2+ switch with some basic L3 routing. No switch does maintain a generic repository of all ARP (MAC<->IPv4) on the network.
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