Ericsson ECN320 - Reserved Vlans, Interfaces and Ports Designation

ECN Functions, Features and HW
1553-CNH 160 0787 Uen PA2 2005-09-23
15
3.2 Reserved VLANs, Interfaces and Ports Designation
Since the ECN acts as a Network Address Translator (NAT) for manage-
ment traffic connecting and hiding the embedded nodes from the Access
Domain Management, different interfaces (each interface is configured in-
dependently) are utilized:
Internal Interface – This interface is the gateway for the embedded nodes.
It has an internal IP Address of the ECN, and uses the internal manage-
ment VLAN.
• External Interface – This interface represents the EAN to the outside
network. It has the IP Address of the ECN, and uses the management
VLAN used in the EDA network.
• Internal Interface Untagged – This interface is used to enable Dy-
namic Management VLAN (DMV). This feature ensures that embedded
nodes will be automatically reconfigured if their configured manage-
ment VLAN is not the same as the internal VLAN in the EAN (for ex-
ample if an IP DSLAM that was connected directly to the EDA network
using VLAN id 246, is connected as an embedded node using VLAN id
247). For more information about the DMV, refer the Management
VLAN Configuration Guide. Note that the ECN does not have to be
configured for the DMV. It automatically supports the DMV for all em-
bedded nodes.
There are two types of ports in the ECN: Uplink ports (ECN320: 25 and 26,
ECN330: 25,26 and 27) and Downlink ports (1 – 24):
• Uplink ports are automatically configured with the External manage-
ment VLAN id (default 246). Any untagged traffic entering an uplink
port is tagged with VLAN id 1 and discarded, since the data will not be
forwarded to any port.
• Downlink ports are configured automatically with the Internal man-
agement VLAN id (default 247). Any untagged traffic entering a
downlink port is tagged with the Untagged VLAN id (default 248). The
embedded nodes can use untagged frames to get information about
the used management VLAN.
Apart from the mentioned VLANs, the EAN also uses VLAN id 4093 inter-
nally.