Installation & Operation Manual 188 Document # LTRT-92224
Mediant 8000
Proceed to the next section 'Working with VLANs' on page 188 to define the
applicable VLAN IDs for each network interface. Keep the Media Gateway locked,
until you complete the network configuration. Apply the new configuration by
locking/unlocking ES boards and then unlocking the Media Gateway as described in
'Activating New Network Interfaces Configuration' on page 214.
26.2.5 Working with VLANs
A virtual LAN (VLAN) is a logical grouping of nodes which communicate as if they
were attached to the broadcast domain, regardless of their physical location. A VLAN
has the same attributes as a physical LAN; however it allows end stations to be
grouped together even if they are not located on the same network switch.
VLANs are created to provide the segmentation services traditionally provided by
routers in LAN configurations. They address the following issues:
Scalability – VLANs facilitate moves, additions, and changes for devices on
networks without the need to add additional hardware
Security – Devices in a VLAN can only communicate with devices on the same
VLAN.
When working within a VLAN, each Ethernet frame in the VLAN is marked with a
VLAN ID (tag). The VLAN ID may be generated by the end-station and carried in the
Ethernet frame itself. Or, alternatively, it may be assigned by the Layer 3 switch,
based on the port used.
26.2.5.1 Using Tagged VLANs for Subnet Separation
Tagged VLANs may be used to separate traffic belonging to different subnets,
transmitted via the same Ethernet cable (port), based on the VLAN ID tag in the
Ethernet frame. In addition, the Mediant 8000 may be connected to the IP network that
uses VLAN tagging for all Ethernet frames transmitted through it – even though subnet
separation is achieved via the use of a separate network interface as described in
Configuring IP Network Interfaces.
26.2.5.2 Configuring VLAN Tags
The chapters below describe how to configure VLAN tags for OAM, Media and Control
Subnets.
The VLAN tags configuration is handled differently according to the configured ES
board:
ES/6600: The new VLAN tags configuration is not applied immediately. Instead
you must lock/unlock ES boards and then unlock the Media Gateway as
described in 'Activating New Network Interfaces Configuration' on page
214.
ES-2:The new VLAN tags are configured in the Subnets entity (see Section
'Configuring VLAN Tags for Media and Control Subnets' on page
189 and applied
immediately ( except for the OAM subnet, which is read automatically from the
OAM Tag ID configuration-see Section 'Configuring VLAN Tags for OAM Subnet'
on page 189).
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