Ten Gig uplink connection between a Nexus 7710 and a Nexus 9396PX [cid:image001.png@01D34F37.DBB51670] ... View more

After discussions with Cisco, we have come to the conclusion to try this, move our VoIP gateways from the current Bridge Domain which is a “/23” grouping/subnet, create a new Bridge Domain with the App Profile, and End point group, but make that segment a “/31” grouping/subnet, and enable “limit IP learning” in that domain. Our thinking is putting those two routers on a smaller segment that won't have a large ARP table. ... View more

Hello Jackson, our company are experiencing the same issue, we thought it was an issue with our VoIP gateway routers due to this bug “CSCto02712” ! CISCO IOS BUG on Voice Router: •CSCto02712 Symptoms: A router that is running Cisco IOS Release 15.1(4)M1 with “proxy-arp” enabled will incorrectly reply to duplicate address detection ARP requests sourced from end devices. Some end devices will send an ARP request for their assigned IP to check for duplicate address detection per RFC5227. When this occurs the router should ignore this ARP request. With this issue, the router will respond to the request, which triggers the duplicate address detection on the end device and breaks connectivity between the router and end device. Conditions: The symptom is observed with the following conditions: –  “proxy-arp” is enabled on client facing Layer-3 interface. –  end device sends a “duplicate address detection” ARP request on its local subnet. Workaround 1: Configure no ip proxy arp on client-facing interface. Workaround 2: Disable “duplicate address detection” on the end device. ! So we changed both of our 3k VoIP routers and we are still seeing the same issue, working with TAC for see next steps, ... View more