SNR S2940-8G-v2 Switch Configuration Guide
Layer 3 Management Configuration
takes out header checksum, thus expedites the processing speed of basic IPv6 header. In IPv6
header, fragment field can be shown as an optional extended field, so that data packets fragmen-
tation process won't be done in router forwarding process, and Path MTU Discovery Mechanism
collaborates with data packet source which enhances the processing efficiency of router.
Address automatic configuration and plug-and-play is supported. Large amounts of hosts can
find network routers easily by address automatic configuration function of IPv6 while obtaining a
globally unique IPv6 address automatically as well which makes the devices using IPv6 Internet
plug-and-play. Automatic address configuration function also makes the readdressing of existing
network easier and more convenient, and it is more convenient for network operators to manage
the transformation from one provider to another.
Support IPSec. IPSec is optional in IPv4, but required in IPv6 Protocol. IPv6 provides security
extended header, which provides end-to-end security services such as access control, confiden-
tiality and data integrity, consequently making the implement of encryption, validation and Virtual
Private Network easier.
Enhance the support for Mobile IP and mobile calculating devices. The Mobile IP Protocol
defined in IETF standard makes mobile devices movable without cutting the existing connection,
which is a network function getting more and more important. Unlike IPv4, the mobility of IPv6 is
from embedded automatic configuration to get transmission address (Care-Of-Address); therefore
it doesn't need Foreign Agent. Furthermore, this kind of binding process enables Correspondent
Node communicate with Mobile Node directly, thereby avoids the extra system cost caused by
triangle routing choice required in IPv4.
Avoid the use of Network Address Translation. The purpose of the introduction of NAT mech-
anism is to share and reuse same address space among different network segments. This mech-
anism mitigates the problem of the shortage of IPv4 address temporally; meanwhile it adds the
burden of address translation process for network device and application. Since the address space
of IPv6 has increased greatly, address translation becomes unnecessary, thus the problems and
system cost caused by NAT deployment are solved naturally.
Support extensively deployed Routing Protocol. IPv6 has kept and extended the supports
for existing Internal Gateway Protocols (IGP for short), and Exterior Gateway Protocols (EGP for
short). For example, IPv6 Routing Protocol such as RIPng, OSPFv3, IS-ISv6 and MBGP4+, etc.
Multicast addresses increased and the support for multicast has enhanced. By dealing with
IPv4 broadcast functions such as Router Discovery and Router Query, IPv6 multicast has com-
pletely replaced IPv4 broadcast in the sense of function. Multicast not only saves network band-
width, but enhances network efficiency as well.
29.2.2 IP Configuration
Layer 3 interface can be configured as IPv4 interface, IPv6 interface.
IPv4 Address Configuration
IPv4 address configuration task list:
1. Configure the IPv4 address of three-layer interface
2. Configure the default gateway
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