Multiple SPB VSIs

You can use multiple SPB VSIs to transmit traffic for different Ethernet services that span different customer sites. Each SPB VSI is identified by a unique I-SID.

For example, the network in Figure 7 has the following SPB VSIs:

• I-SID 300 extends traffic to customer sites B, C, and D.

• I-SID 400 extends traffic to all customer sites.

• I-SID 500 extends traffic to customer sites A and D.

All traffic in one SPB VSI is transmitted in one B-VLAN. Different SPB VSIs can use the same B-VLAN to transmit traffic. Traffic of different SPB VSIs is isolated by I-SID.