HP Virtual Connect Flex-10 10Gb Ethernet Module for c-Class BladeSystem - Manual (Page 198)

Virtual Connect server profiles 198
If the selected network is part of a shared uplink set, it has an associated external VLAN mapping. This
external VLAN is used to pre-populate the server-assigned VLAN entry to maintain consistency throughout the
VC domain. However, multiple networks on different shared uplink sets can have the same external VLAN
mapping. If those networks are selected for the same server port, you must edit the server VLAN to ensure all
VLANs are unique for each server port.
Server VLAN mappings are not linked to the uplink VLAN mappings. If a pre-populated server VLAN
mapping is accepted, and later the uplink VLAN mapping is changed, the changes are not propagated to the
server side.
VLAN ID mapping guidelines
• For each server port, all VLAN mappings must be unique. When the 'Force same VLAN mappings as
Shared Uplink Sets' option is selected, this setting is handled automatically because all networks within
a shared uplink set must have unique VLAN IDs. If the 'Force same VLAN mappings as Shared Uplink
Sets' option is not selected, then each network can only be mapped once (including untagged).
• Different server VLANs can be mapped to the same network between two different server ports. For
example, in server port 1, server VLAN 100 maps to the Purple network. In port 2, server VLAN 200
also maps to the Purple network. The result is that these different server VLANs can communicate with
each other directly, and a broadcast frame on VLAN 100 from server port 1 is sent into the VC Domain
and comes out to VLAN 200 on server port 2. This behavior extends to any number of different server
VLANs mapped to the same vNet in any given VC Domain.
• The same server VLAN can be mapped to two different networks. This action has a similar but opposite
effect to the above scenario. For example, server VLAN 300 is mapped to the Green network on server
port 1, but mapped to the Red network on server port 2. This mapping means that server VLAN 300 is
split into separate broadcast domains for different server ports.
• A network can only be mapped to a physical port once. Any additional mappings created by the server
profile result in an error.