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Cisco Bug: CSCup23223 - QinQ - ARP stops working when ARP inspection enable

Last Modified

Nov 27, 2020

Products (1)

  • Cisco ME 3400 Series Ethernet Access Switches

Known Affected Releases


Description (partial)

ARP doesn't work in QinQ setup if ARP inspection is enable. ARP inspection can be enable on any VLAN to trigger the issue, even not related to QinQ.

Customer_SW1#sh ip arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet                 -   001c.b0ee.c341  ARPA   Vlan30
Internet                 0   Incomplete      ARPA

ARP inspection enabled on ISP switch. The issue was found on ME-3400 switch with 12.2(60)EZ4. Other platforms or IOS releases might also be affected.
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