HP 1.10GB Virtual Connect Ethernet Module for c-Class BladeSystem - Manual (Page 71)

Network management 71
The following figure shows tunneled VLAN tags. On the dedicated, green network, both uplink and server
VLAN tags are tunneled through Virtual Connect unchanged. On the shared, red and blue networks, uplink
VLAN tags are mapped to networks. Untagged frames are mapped to the native VLAN, if present, otherwise
they are dropped. Server frames are untagged only, and tagged frames are dropped. Each server port is
connected to a single network.
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