Verilink 9000 Series (34-00271) Product Manual Manual de usuario descargar pdf (Pagina 302)

280 CHAPTER 17: BRIDGE

Multicast MAC Address

The Multicast MAC address parameter is the 6-byte long MAC address recognized

by the bridge as the group address for BPDU transfer between bridges. When a

bridge is sending a BPDU frame, all the other bridges should receive the BPDU

frame. The sending bridge inserts this MAC address in the destination field of the

frame sent to the LAN.

The default value is defined in the 802.1d standard.

LAN Path Cost

The LAN Path Cost parameter is used in the spanning tree algorithm to quantify

the efficiency path of the LAN compared to the WAN Path Cost parameter. The

range for this field is 1 to 65535 Mbps and the default is 100.

WAN Path Cost

The WAN Path Cost parameter is used in the spanning tree algorithm to quantify

the efficiency path of the WAN compared to the LAN Path Cost parameter. The

selections are 1 to 65535 Mbps and the default is 667.

Bridge ID

For the spanning tree algorithm to work properly, every bridge in the network

should have its own identifier. The bridge identifier is eight bytes long and it is

constituted of two parts: A bridge priority and its own MAC address. The bridge

with the smaller identifier, when compared as two binary numbers, is considered as

the bridge with the higher priority. The bridge with the higher priority is selected

as the root bridge and sits on the top of the spanning tree. The choice of the

bridge’s identifier influences the network performance. Because the MAC address

part of the identifier is fixed in the hardware interface, this field is used to define

the bridge’s priority in the network. The selections range from 0

to 255.

Hello Timer

The Hello Timer parameter specifies the interval between broadcasting Bridge

Protocol Data Unit (BPDU) frames by the Root bridge. This value defines the

period needed to detect a network topology change and to inform all bridges of

this modification. A network modification includes a bridge failure, a port link

failure, the addition of a new bridge or anything that could modify the data path

between bridges. The Max Age Timer must be at least three times greater than the

Hello Timer. The selections are 1 to 65535 seconds and the default is 2. A

recommended value for a stable network is 20.

Forward Delay

The Forward Delay parameter corresponds to the interval, in seconds, of each of

the four states of the spanning tree algorithm: blocking, listening, learning, and

forwarding. The selections are 1 to 65535. The default is 15 seconds.

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Verilink 9000 Series (34-00271) Product Manual Manual de usuario Pagina 302