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Draytek VigorSwitch G1240 Manual

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VigorSwitch G1240 User’s Guide
35
If we plan to deploy four VLANs in an office and use a switch to partition them, we should
check which ports belong to which VLAN first. Assuming a 24-port switch is applied.
Name VID Port Members
Marketing
2
1,2,3,4,5
Service
3
6,7,20,21,22
Sales
4
8,9,10,11,12,13,14,15,16
Administration
1
17,18,19,23,24
Next, assigns IP address to each VLAN. Usually, we use 10.x.x.x as internal IP block.
Because there are total four VLANs in the network, we must assign 4 IP blocks to each of
them.
Name VID Port Members
Marketing
2 10.1.2.0/24
Service
3 10.1.3.0/24
Sales
4 10.1.4.0/24
Administration
1 10.1.1.0/24
Here we apply the subnet mask 255.255.255, and each VLAN is capable of supporting 254
nodes.
2
2
.
.
6
6
L
L
i
i
n
n
k
k
A
A
g
g
g
g
r
r
e
e
g
g
a
a
t
t
i
i
o
o
n
n
Basically, Link Aggregation is to aggregate the bandwidth of more than one port to an
assigned logical link. This highly increases total bandwidth to the targeted device. There is
more than one Link Aggregation technology in many vendors’ switch products already,
which may cause the problem of interoperability. This is the reason why now we have
802.3ad Link Aggregation Control Protocol (LACP).
W
W
h
h
y
y
8
8
0
0
2
2
.
.
3
3
a
a
d
d
(
(
L
L
A
A
C
C
P
P
)
)
?
?
Network is varying. For example, if a port malfunctioned or unplugged accidentally in a
static trunk port, administrator has to reconfigure it, or the network will get trouble.
Therefore, offering a tool with automatic recovery capability is necessary for an
administrator. LACP is a protocol that allows a switch able to know whether its partner has
the capability to co-setup a trunk between them.
Usually, if administrator wishes to increase the bandwidth of a specific link, he may:
1. Buy new network equipments with higher throughput, or
2. Aggregate the bandwidth of more than one port to a logical link.
If the item 1 is the case, you will pay much more cost beyond your budget, and the solution
caused by the limitation of hardware performance may not be scalable.
If the item 2 is the case, now you do not have to pay much more extra cost and can keep
flexible according to the demand of bandwidth because all equipments are there already.
And what’s more, you can avoid worrying about the interoperability issue. Applying LACP
in your network, you will not only gain benefits below to improve the performance of your
network but also have these investments usable to future new products.
… 41 …


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