Table 3-4 Schemes for inter-VLAN communication
Inter-VLAN
Communica
tion Scheme
Advantage Disadvantage Usage Scenario
Sub-interface After sub-interfaces are
configured, users in
different VLANs and
network segments can
communicate with
each other as long as
routes are reachable.
l Both Layer 2 and
Layer 3 devices are
required, which
increases
expenditure.
l If multiple users on a
network belong to
different VLANs,
each VLAN requires
a sub-interface on a
Layer 3 device. Each
sub-interface needs
to be assigned an IP
address. This
increases
configuration
workload and uses
up a large number of
IP addresses.
This scheme is
applicable to small-
scale networks on
which users belong to
different network
segments.
VLANIF
interface
After VLANIF
interfaces are
configured, users in
different VLANs and
network segments can
communicate with
each other as long as
routes are reachable.
Inter-VLAN
communication can
also be implemented by
Layer 3 switches if
routes are reachable.
This scheme boasts of
low operating costs.
If multiple users on a
network belong to
different VLANs, each
VLAN requires a
VLANIF interface.
Each VLANIF interface
needs to be assigned an
IP address. This
increases configuration
workload and uses a lot
of IP addresses.
This scheme is
applicable to small-
scale networks on
which users belong to
different network
segments and IP
addresses of these
users are seldom
changed.
VLAN
Switch
The system forwards
frames without
searching the MAC
address table,
improving forwarding
efficiency and network
security.
If there are a large
number of users
connected to a switch,
each user needs to be
configured with a static
forwarding path. This
imposes a configuration
burden on network
administrators.
This scheme is
applicable to small-
scale and topology-
stable networks.
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 3 VLAN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
74
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