HP Virtual Connect 4Gb Fibre Channel Module for c-Class BladeSystem - Manual (Page 66)

Network management 66
The following figure shows mapped VLAN tags, a feature that enables users to define how each server
VLAN tag is mapped to a specific network. Each server port can connect to multiple networks. Server
NIC1 is connected to both the Green and Red networks. Server NIC2 is connected to the Red network,
and Server NIC3 is connected to the Red, Blue, and Orange networks. All server NICs can send and
received tagged or untagged traffic.
If Virtual Connect is set to map VLAN tags, VC-Enet modules accept incoming frames with valid server
VLAN tags and translate server-assigned VLANs into corresponding internal network VLANs, thus placing
the server packet on the correct network. When these frames reach the uplinks, network VLANs are once
again translated into external data center VLANs. Similarly, VLANs are translated back to server-assigned
VLANs (or stripped and untagged) before sending frames out to servers. This function allows for the
possibility of configurations where server VLANs might not match external VLANs used on uplinks. To
avoid this scenario, you can select the 'Force server connections to use the same VLAN mappings as
shared uplink sets' option.
Server port connections to networks are defined on the Define Server Profile screen (on page
97 ).
Restrictions and limitations
• Maximum number of networks per shared uplink set:
o For Virtual Connect v1.34 and Virtual Connect v2.10 – 64 networks
o For all other versions of Virtual Connect – 32 networks
• Maximum of 28 server VLAN-to-network mappings per server link
• You can either select to tunnel VLAN tags or map VLAN tags on a domain, but not both. The option
is grayed out if it is not supported by the configuration.
• The port VLAN ID must be selected from a specific shared uplink set.
• When the 'Tunnel VLAN Tags' option is selected on the Ethernet Settings (Advanced Settings) screen
(on page 63 ) or the 'Enable VLAN Tunneling' option is selected on the Define Ethernet Network
screen (on page 50 ), server VLAN tagging is supported only on networks with dedicated uplinks and
cannot be used with shared uplink sets.
• If the 'Tunnel VLAN Tags' option is selected and VLAN tunneling is enabled on any dedicated
network, the 'Map VLAN Tags' option cannot be selected. VLAN tunneling must be disabled on all