Ericsson EDN312 Guía de usuario descargar pdf (Pagina 19)

Function Description

4/1553-HSC 901 101/2 Uen B 2009-02-27

Link Aggregation

Link Redundancy

Standby

Data and management

RSTP Enabled

Active

RSTP Enabled

Level Aggregation Switch

Figure 7 Link Redundancy and Aggregation Scenarios

There is no difference between the two uplink ports of the EDN312x. It

does not matter which port is connected to which aggregation switch. The

EDN312x draws power from one of the links. There is no indication and it is

not possible to know which link supplies the power (this also applies to the

redundancy scenario).

Note: If the link that is supplying the EDN312x is disconnected, or the

power fails, the EDN312x will restart and draw power from the

other link.

Link Aggregation

When Link Aggregation is deployed for the first time, the link that is first up

will be used for all the uplink traffic. The downlink traffic will be distributed

by the Ethernet Node Controller (ECN) between the two links. After the first

time, the IP DSLAM will always first try the link that was last used. The link

aggregation facility complies with IEEE 802.3ad.

Link Redundancy

When Link Redundancy is deployed, one ECN is configured as active and

one ECN is configured as standby. Only the active ECN will reply to the IP

DSLAM’s DHCP request with a valid DHCP offer. In both ECNs, RSTP is

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Ericsson EDN312 Guía de usuario Pagina 19