SignaMax 065-7931 User's Guide download pdf (Page 46)

Signamax 065-7931 16-Port 10/100/1000BaseT/TX WebSmart Switch

MAC address aging

There is a field in the MAC address table used to establish the entry’s Age

time, which determines how long a MAC entry can reside in a switch. The age time

is refreshed when a packet with that SA is received. Usually, the age time is

programmable.

Transmission schedule

In most layer 2 switches, the QoS function is supported. QoS in a switch

must associate a transmission schedule to transmit the packet. This function has

much to do with the priority level a packet has. With the given priority, the scheduler

will perform the proper action upon it. The scheduler has many ways to be

implemented, and different chips may support different scheduling algorithms. The

most common schedulers are:

FCFS: First Come, First Service.

Strictly Priority: All High before Low.

Weighted Round Robin:

Set a weight figure to the packet with a given priority level, say 5-7, and

next, set another weight to the packet with a different priority level, say 2-4 and so

on. The WRR scheduler will transmit the packet, taking the weight into account.

Therefore, packets of each priority level can be allocated a fixed bandwidth.

Bandwidth rating

Bandwidth rating is the limitation set by administrator, and it can be applied

to those with SLA. Bandwidth rating can be total bandwidth, or types of service of a

port with many steps. The switch supports by-port Ingress and Egress total

bandwidth rate control capacity. The bandwidth rate resolution is 0.1 Mbps (100

Kbps) and ranges from 0 to 100 Mbps.

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SignaMax 065-7931 User's Guide Page 46