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Cisco Bug: CSCup67852 - Virtio non-promiscuous (NIC echos inbound packets not addressed to it)

Last Modified

Jun 09, 2017

Products (1)

  • Cisco IOS XRv Router

Known Affected Releases

5.1.2.BASE

Description (partial)

Symptom:
Host running XRv sees duplicate ping replies when attempting to ping its gateway.

Conditions:
XRv connected to a hub (or more generally, a bridge that does not learn MAC addresses and instead broadcasts all packets to all connections). When packets are exchanged between other devices connected to this bridge (e.g., another router or the host server and the network gateway), XRv receives the ping request and re-echos it onto the bridge, causing the host to receive duplicate pings.

This issue has only been seen when using virtio network devices in XRv.
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