Qtech QSW-3900-24-SFP-DC [81/245] Layer 3 configuration

Qtech QSW-3900-48-SFP-DC [81/245] Layer 3 configuration
QTECH Software Configuration Manual
6-80
Chapter 6 Layer 3 Configuration
6.1 Brief Introduction of Layer 3 switching
The major difference between the packet switching operation of a router and that of a Layer 3 switch is the
physical implementation. In general-purpose routers, packet switching takes place using a microprocessor, whereas a
Layer 3 switch performs this using application-specific integrated circuit (ASIC) hardware.
L3 switching can move traffic at wire speed and also provide layer 3 routing, which can remove the
bottleneck from the network routers. This technology is based on the idea of "route once, switch many". L3 switching
can make routing/switching decisions based on the following
· MAC source/destination address in a Data Link frame
· IP source/destination address in the Network layer header
· Port source/destination numbers in the Transport layer header
There is no performance difference between a layer 2 and a layer 3 switch because the routing/switching is
all hardware based.
QTECH QSW-3900 is a GE Intelligent Routing Switch based on ASIC technology which can support
transmission in both layer 2 and layer 3. The interaccessing of hosts in the same VLAN is the transmission in layer 2
and the interaccessing of hosts in the different VLAN is the transmission in layer 3.
6.2 Layer 3 Cnfiguration list
Configuration list is as following :
· VLAN division and the creation of layer 3 interface
· Transmission mode configuration
· Create VLAN interface for normal VLAN
· Create superVLAN interface and add VLAN to superVLAN
· Configure IP address for VLAN interface or superVLAN interface
· ARP proxy configuration
· Display interface configuration
6.2.1 VLAN division and the creation of layer 3 interface
VLAN division please refers to VLAN configuration chapter.
Layer 3 interface includes normal VLAN interface and superVLAN interface. Normal VLAN interface is the
interface in some concrete VLAN; superVLAN interface is created in superVLAN (superVLAN is the VLAN which
is not existed and contains no interface) which can contain many subVLANs (subVLAN is the existed concrete
VLAN). At most 258 layer 3 interfaces can be created, among which superVLAN can be 128 at most.
The total maximum number of VLAN contained by all layer 3 interfaces is 258. Each VLAN only exists in
one layer 3 interface. In superVLAN, interface must be untagged member in only one subVLAN, and tagged in other
subVLANs.
6.2.2 Transmission mode configuration
QTECH QSW-3900 supports two types of packet transmission mode : 1flow transmission ;2network
topology transmission. Searching failed route or host route with the unreached destination in flow transmission mode;
these packet will be dropped in network topology trsnamission. It is defaulted to be flow transmission mode.
Please configure it in global configuration mode :

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