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Advisory: (Revision) HP Virtual Connect - HP Virtual Connect Must Enable VLAN Mapped Mode when Interfacing with Layer 2 Bridging Devices


Document ID: c02684783

Version: 2

Advisory: (Revision) HP Virtual Connect - HP Virtual Connect Must Enable VLAN Mapped Mode when Interfacing with Layer 2 Bridging Devices
NOTICE: The information in this document, including products and software versions, is current as of the Release Date. This document is subject to change without notice.

Release Date: 2011-03-23

Last Updated: 2011-03-23


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Updated document with additional details
Original document release

In HP Virtual Connect, when Ethernet networks are configured to tunnel VLAN tags, devices that bridge network traffic at Level 2 (for example, some third-party load balancers), may experience connectivity problems for the server blades using the networks with tunneled VLAN tags. Connectivity issues may include such things as sporadic response to pings from devices exterior to the enclosure, and routing anomalies.

This does not occur in the case of a device that bridges VLANs at Level 2, but where only one of the bridged VLANs is sent to the VC VLAN tunneled network.

Note: This configuration is rare and is not HP or VC specific. For this issue to occur, VC must be used to tunnel VLAN tags; in addition, any form of layer 2 bridging device must be attached and configured to bridge together two or more of these interfaces.

When VC is in VLAN tunnel mode, it maintains a single MAC Address table for the tunneled VC network even though it encompasses multiple VLANs (this is normal). The result is that when a host (physical or VM) inside the VC Domain sends a broadcast like an ARP, it is sent out the VC uplink on one VLAN, traverses through the load balancer and is broadcast on the load-balanced VLAN. If that VLAN is also sent to the VC uplink port, the MAC address of the host is learned outside of VC. Like any 802.1d bridge, subsequent traffic sent to that host's MAC address and received on the VC uplink is discarded as VC has learned that the MAC address resides outside the domain. The normal MAC address aging time in VC and most other switches is 5 minutes, so this condition will exist until the entry aged out.


Any HP c-Class BladeSystem enclosure running HP Virtual Connect when networks are configured to tunnel VLAN tags.


If any software or device is being used to bridge two VLANs together, disable the tunneling of VLAN tags and map the VLAN tags instead, using the Virtual Connect "Map VLAN Tags" option in Server VLAN Tagging Support. Refer to the Ethernet Settings (Advanced Settings) section of the HP Virtual Connect for c-Class BladeSystem User Guide for details on configuring these settings:

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Hardware Platforms Affected: HP BladeSystem c3000 Enclosures, HP BladeSystem c7000 Enclosures, HP Virtual Connect Flex-10 10Gb Ethernet Module for c-Class BladeSystem, HP Virtual Connect Manager (VCM) Software
Operating Systems Affected: Not Applicable
Software Affected: Not Applicable
Support Communication Cross Reference ID: IA02684783
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