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Catalyst 2960s: issue with mac learning and disabled ip device tracking

igloo_kem
Level 1
Level 1

Hi all!

Firstly, i'm sorry for my english.

Setup: Server Linux box  <->  Cat 2960S IOS 15.2(1)E <-> GW Linux box

When I disable ip device tracking on Cat2960S (no macro auto monitor command), after aging-time switch drops record about mac of the GW from the mac address table (starts to flood traffic from Server to all active ports), and doesn't add it back, until i run arp -d IP_OF_GW on Server (Server sent ARP request to GW and get answer).

I have a persistent traffic from Server to GW, so there are a lot of refs to the record with GW mac in arp table of Server (it means that Server might not sent ARP requests to the GW for a long time).

It means that switch learn mac of GW only from ARPs. Am i right? Is it normal behaviour in this version of IOS? If yes - where i can read about it?

If i enable ip device tracking back, switch start to sent ARPs by ourself.

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