3com 10002211 Manuel D’Utilisation

A

PPENDIX

 C: VLAN

S

 

ON

 

THE

 C

ORE

B

UILDER

 S

YSTEM

This example shows how flooding decisions are made according to VLANs 
set up by protocol (assuming an 18-port switch):

If data arrives on a switch port for a certain protocol and VLANs for 
that protocol are defined in the system but not on that switch port, the 
default VLAN defines the flooding domain for that data. This case is 
called VLAN exception flooding.

This example shows how the VLAN exception flooding decision is made 
(assuming an 18-port switch):

1

Default

1 - 18

2

IP

1 - 12

3

IPX

11 - 16

IP - port 1

VLAN 2

IP data received matches IP VLAN on the 
source port.

IPX - port 11

VLAN 3

IPX data received matches IPX VLAN on the 
source port.

XNS - port 1

VLAN 1 

XNS data received matches no protocol 
VLAN, so the Default VLAN is used.

1

Default

1 - 18

2

IP

1 - 10

XNS - port 1

VLAN 1

XNS data does not match any defined VLAN 
in the system.

IP - port 2

VLAN 2

IP data received matches IP VLAN 2 for 
source ports 1 - 10.

IP - port 12

VLAN 1 

IP data received on source port 12 does not 
match any defined source port for IP VLAN, 
so the Default VLAN is used.