RAD Data comm 100 Especificações descarregar pdf (Página 47)

Installation and Operation Manual Chapter 1 Introduction

Egate-100 Ver. 4.0 Functional Description 1-15

VLAN-Unaware Mode

In this mode the bridge forwarding ignores the VLAN ID of VLAN-tagged frames.

Each Ethernet packet received from each bridge port (Gigabit Ethernet or E1/T1s)

is forwarded according to its destination MAC address.

The bridge features in VLAN-unaware mode are:

• Learning and forwarding according to MAC address only

• Learning of up to 64,000 MAC addresses

• MAC learning limit – can be configured for each bridge port

• Aging time – can be configured at the bridge level

• VLAN tagged frames transparency (forwarding according to MAC only)

• MAC table viewing

• Optional loop detection

• Ethernet OAM (802.3ah).

Ingress Process

All frames are accepted in this mode: untagged, priority-tagged, or VLAN-tagged.

Learning and forwarding is based on the MAC addresses, independent of the

VLAN. This mode is sometimes referred to as transparent mode, due to

“tag transparency”.

Learning Process

The learning process observes the source MAC address (SA) of the received frame

and updates the forwarding database (FDB) with the MAC and the bridge port

that the frame was received from. The FDB is also referred to as the MAC table.

The learning process inserts a new entry into the MAC table. This entry consists

of MAC and bridge port.

• If the MAC already exists for the same bridge port, the aging time is updated

• If the MAC already exists, but for a different bridge port (dynamic entry), the

new entry overrides the existing one.

Aging Process

The aging process checks the forwarding MAC table periodically. Each dynamic

entry aging time period that has exceeded the configured Aging Time Limit is

deleted. The aging time period is the period of time since the last frame for this

entry entered the bridge. The periodic check of the MAC table (aging time

intervals) results in an actual aging time that can reach up to twice the value that

was configured by the user.

Forwarding Process

The forwarding process is performed based on the frame MAC Destination

Address (DA). The frame is forwarded to the port specified in the MAC table for

this MAC.

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 317 318

Sem comentários

RAD Data comm 100 Especificações Página 47