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

Last Modified

Mar 06, 2018

Products (1)

  • Cisco ME 3400 Series Ethernet Access Switches

Known Affected Releases

12.2(58)EZ

Description (partial)

Symptom:
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  1.1.1.1                 -   001c.b0ee.c341  ARPA   Vlan30
Internet  1.1.1.2                 0   Incomplete      ARPA

Conditions:
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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