
l
The services of different virtual bridges are isolated and the services with different VLAN
IDs in the same virtual bridge are also isolated. The switching domain of the entire virtual
bridge is divided into multiple sub-switching domains according to the VLAN IDs.
NOTE
As shown in
, the same logical port may belong to one or more sub-switching domains with
different VLAN IDs. On the U2000, the same logical port can belong to multiple filtering tables with
different VLAN IDs.
Figure 4-17
Transparent bridge and virtual bridge
PORT1
PORT2
PORT3
VLAN1
VLAN2
VLAN3
Virtual bridge
PORT1
PORT2
PORT3
Pure bridge
VCTRUNK1
VCTRUNK2
VCTRUNK3
VCTRUNK4
VCTRUNK5
VCTRUNK6
VCTRUNK1
VCTRUNK2
VCTRUNK3
VCTRUNK4
VCTRUNK5
VCTRUNK6
VLAN1
VLAN2
VLAN3
. . .
Logical port
Table 4-6
Transparent Bridge and Virtual Bridge
Item
Transparent Bridge
Virtual Bridge
VLAN filtering table
It is not configured.
It must be configured.
Ingress filter
Does not check the validity of
VLAN tags. All data frames
that enter the bridge are valid.
Check the validity of VLAN
tags. If the VLAN ID is not
the same as the VLAN ID
defined in the VLAN
filtering table, discard the
data frame.
MAC address learning mode SVL
IVL
Data frame forwarding mode Query the MAC address table
to obtain the forwarding port
of the data frame according to
the destination MAC address
of the data frame.
Query the MAC address table
to obtain the forwarding port
of the data frame according to
the destination MAC address
and VLAN ID of the data
frame.
Broadcast range
Forward broadcast data
frames on all ports of a
bridge.
Forward the broadcast data
frames on the forwarding
ports defined in the VLAN
filtering table.
4 Configuring Ethernet Services
OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
4-20
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 02 (2011-06-30)