Isolate-User-Vlan Configuration - 3Com 7757 Configuration Manual

114 C 13: I
HAPTER SOLATE
Isolate-User-VLAN
Configuration
Isolate-User-VLAN
Configuration Tasks
-U -VLAN C
SER ONFIGURATION
Figure 35 Diagram for isolate-user-VLAN application
SwitchA
Eth2/0/1
SwitchB
Isolate-user-VLAN 5
Eth2/0/2
VLAN3
Host
Forward packets to Switch A
1 When packets sent by PC reached Ethernet2/0/4, the default VLAN ID, that is, the
VLAN tag of VLAN 3 is automatically added to the packets.
2 Switch B learns the MAC address of the PC, and adds it to the MAC address
forwarding table of VLAN 3, and at the same time copies the entry to the MAC
address forwarding table of VLAN 5.
3 Because Ethernet2/0/1 belongs to VLAN 3, the packets from VLAN 3 can pass
through it, and Ethernet2/0/1 automatically removes the tag of VLAN 3, so that
packets reaching Switch A is without the VLAN tag.
Receive and forward packets from Switch A
1 When packets coming from Switch A (the packets are configured to be without
VLAN tag) reach to port Ethernet2/0/1 of Switch B, the packets are automatically
added with default VLAN ID, that is, the tag of VLAN 5.
2 According to the MAC address forwarding table copied in the outbound process,
the system will find the egress port being Ethernet2/0/4.
3 Because Ethernet2/0/4 belongs to VLAN 5, packets can pass through it normally,
and at the same time, Ethernet2/0/4 removes the VLAN tag of the packets. So that
the PC receives packets without VLAN tag.
Table 62 isolate-user-VLAN configuration tasks
Operation
Configure isolate-user-VLAN
Configure secondary VLAN
Add ports to
isolate-user-VLAN and
secondary VLAN and
configure them to perform
untag operation on packets
Description
Required
Required
Required
Related section
"Configuring
Isolate-User-VLAN" on page
115
"Configuring Secondary
VLAN" on page 115
"Adding Ports to
isolate-user-VLAN and
Secondary VLAN" on page
115