Alcatel Carrier Internetworking Solutions Switch/Router Manuale Utente

Page 16-6

Since spanning tree is group based, the physical port in the above diagram participates in 
three spanning tree instances: one for untagged traffic and two for 802.1Q tagged traffic. Both 
types of frames can now pass through the same port. 

♦ Important Notes ♦

Since a trunk is a service, and Alcatel switches have a 
16 (10/100) or 15 (Gigabit) services per port limit, only 
15 or 14 

802.1Q

 groups can be added to the same port. 

In both cases, a default bridge service occupies one of 
the service slots. 

For Kodiak ASIC-based Fast Ethernet and Gigabit Ether-
net modules, up to 64 groups are supported using 
multiple spanning tree on an 

802.1Q

 link. To support 64 

groups, the following lines should be added into the 

 file :

See Chapter 7, “Managing Files,” for more information 

on editing text files.