Ericsson ECN330, Руководство пользователя

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Management Features Overview
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1553-KDU 137 365 Uen D 2006-06-16
Tunneling – Configures tunnels for customer traffic crossing the service
provider’s network using IEEE 802.1Q or Layer 2 over MPLS.
• IEEE 802.1Q Tunneling (QinQ) – This feature is designed for service
providers carrying traffic for multiple customers across their networks.
QinQ tunneling is used to maintain customer-specific VLAN and Layer
2 protocol configurations even when different customers use the same
internal VLAN IDs. This is accomplished by inserting Service Provider
VLAN (SPVLAN) tags into the customer’s frames when they enter the
service provider’s network, and then stripping the tags when the frames
leave the network.
• Layer 2 over MPLS (L2MPLS) – This feature encapsulates Ethernet
frames in MPLS packets and uses label stacking to forward them across
an MPLS tunnel. Tunnel labels define the path across the MPLS
network and virtual channel labels define the entry and exit points to the
customer. The edge switches connected to the service provider’s
network add and remove these labels as appropriate for packet
encapsulation.
Ethernet Automatic Protection Switching – EAPS can be used to increase
the availability and robustness of Ethernet rings, e.g. used in Metropolitan Area
Networks (MAN). EAPS technology converges in less than 500 ms. EAPS does
not limit the number of nodes included in the ring structure. The convergence
time is independent of the number of nodes in the ring.
Power over Ethernet – The ECN330-switch’s 24 Fast Ethernet ports support
Power-over-Ethernet (PoE) that enables DC power to be supplied to attached
devices over the unused pairs of wires in the connecting Ethernet cable.