Huawei Quidway S7700 Configuration Manual - Ethernet page 91

Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet
Table 3-4 Schemes for inter-VLAN communication
Inter-VLAN
Communica
tion Scheme
Sub-interface
VLANIF
interface
VLAN
Switch
Issue 01 (2011-07-15)
Advantage
After sub-interfaces are
configured, users in
different VLANs and
network segments can
communicate with
each other as long as
routes are reachable.
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.
The system forwards
frames without
searching the MAC
address table,
improving forwarding
efficiency and network
security.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Disadvantage
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.
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.
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.
3 VLAN Configuration
Usage Scenario
This scheme is
applicable to small-
scale networks on
which users belong to
different network
segments.
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.
This scheme is
applicable to small-
scale and topology-
stable networks.
74