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Chapter 1 Introduction Installation and Operation Manual

1-10 Functional Description Egate-100 Ver. 4.0

SONET Mapping

The following figure illustrates the mapping of T1s over SONET.

Figure

1-6. Low Order: OC-3 / STS-1 SPEs / VT Group / VT1.5s / T1s

Gigabit Ethernet Link Aggregation

The two Gigabit Ethernet ports can be configured to operate independently as

two separate Ethernet interfaces, or as a single Ethernet interface with link

aggregation mode in accordance with IEEE 802.3ad (without LACP). This mode

inherently provides redundancy: if one of the two Ethernet ports fails, the second

one takes over.

The two Gigabit Ethernet ports use link aggregation in accordance with

IEEE 802.3ad without LACP (Link Aggregation Control Protocol). In the virtual link

group only one link transmits at a time. If the transmitting link encounters an

error, Egate-100 switches to the redundant link in the group.

With link aggregation, the two Gigabit Ethernet ports serve as a single logical

interface. The two ports must be connected to the same switch/router and set to

the same speed and full duplex autonegotiation must be enabled.

Figure

1-7

illustrates link aggregation mode.

Figure

1-7. Link Aggregation Mode

Failure of one of the links is detected by sensing the loss of valid signals at a

port, in which case the traffic is sent through the remaining port.

The equipment connected to the Gigabit Ethernet ports must support and be

configured for link aggregation according to 802.ad with LACP disabled:

• Layer 2 switching networks – signal loss

As the two Gigabit Ethernet ports serve as a single logical interface, the learning

tables do not change as a result of the interface flip.

The switching time for Gigabit Ethernet optical interfaces is below 50 ms. For

1000BaseT, the switching time is below 1 second, limited by the longer loss of

signal detection for 1000BaseT technology.

For Gigabit Ethernet redundancy to work properly when 802.3ad is enabled, both

Gigabit Ethernet ports must be set to full duplex mode at the same line speed,

and autonegotiation must be enabled.

Note

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