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12.2
The Trunk Summary Screen
Click
Configuration > Network > Interface > Trunk
to open the
Trunk
screen. This screen lists the configured trunks and the load balancing algorithm
that each is configured to use.
Figure 172
Configuration > Network > Interface > Trunk
The following table describes the items in this screen.
Table 74
Configuration > Network > Interface > Trunk
LABEL
DESCRIPTION
Show Advance
Settings / Hide
Advance Settings
Click this button to display a greater or lesser number of configuration
fields.
Enable Link
Sticking
Enable link sticking to have the system route sessions from one source
to the same destination through the same link for a period of time.
This is useful for accessing server that are incompatible with a user's
sessions coming from different links.
For example, this is useful when a server requires authentication.
This setting applies when you use load balancing and have multiple
WAN interfaces set to active mode.
Timeout
Specify the time period during which sessions from one source to the
same destination are to use the same link.
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12.3
Configuring a Trunk
Click
Configuration > Network > Interface > Trunk
and then the
Add
(or
Edit
) icon to open the
Trunk Edit
screen. Use this screen to create or edit a WAN
trunk entry.
Figure 173
Configuration > Network > Interface > Trunk > Add (or Edit)
Enable Default
SNAT
Select this to have the ZyWALL use the IP address of the outgoing
interface as the source IP address of the packets it sends out through
its WAN trunks. The ZyWALL automatically adds SNAT settings for
traffic it routes from internal interfaces to external interfaces.
Default Trunk
Selection
Select whether the ZyWALL is to use the default system WAN trunk or
one of the user configured WAN trunks as the default trunk for routing
traffic from internal interfaces to external interfaces.
User
Configuration /
System Default
The ZyWALL automatically adds all external interfaces into the pre-
configured system default
SYSTEM_DEFAULT_WAN_TRUNK
. You
cannot delete it. You can create your own
User Configuration
trunks.
Add
Click this to create a new user-configured trunk.
Edit
Double-click an entry or select it and click
Edit
to open a screen where
you can modify the entry’s settings.
Remove
To remove a user-configured trunk, select it and click
Remove
. The
ZyWALL confirms you want to remove it before doing so.
Object
References
Select an entry and click
Object Reference
s to open a screen that
shows which settings use the entry. See
Section 11.3.2 on page 230
for an example.
#
This field is a sequential value, and it is not associated with any
interface.
Name
This field displays the label that you specified to identify the trunk.
Algorithm
This field displays the load balancing method the trunk is set to use.
Apply
Click this button to save your changes to the ZyWALL.
Reset
Click this button to return the screen to its last-saved settings.
Table 74
Configuration > Network > Interface > Trunk (continued)
LABEL
DESCRIPTION
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Each field is described in the table below.
Table 75
Configuration > Network > Interface > Trunk > Add (or Edit)
LABEL
DESCRIPTION
Name
This is read-only if you are editing an existing trunk. When adding a new
trunk, enter a descriptive name for this trunk. You may use 1-31
alphanumeric characters, underscores(
_
), or dashes (-), but the first
character cannot be a number. This value is case-sensitive.
Load
Balancing
Algorithm
Select a load balancing method to use from the drop-down list box.
Select
Weighted Round Robin
to balance the traffic load between
interfaces based on their respective weights. Weighted round robin is
activated only when the first group member interface has more traffic
than it can handle.
Select
Least Load First
to send new session traffic through the least
utilized trunk member.
Select
Spillover
to send network traffic through the first interface in the
group member list until there is enough traffic that the second interface
needs to be used (and so on).
The table lists the trunk’s member interfaces. You can add, edit, remove,
or move entries for user configured trunks.
Add
Click this to add a member interface to the trunk. Select an interface and
click
Add
to add a new member interface after the selected member
interface.
Edit
Double-click an entry or select it and click
Edit
to open a screen where
you can modify the entry’s settings.
Remove
To remove a member interface, select it and click
Remove
. The ZyWALL
confirms you want to remove it before doing so.
Move
To move an interface to a different number in the list, click the
Move
icon. In the field that appears, specify the number to which you want to
move the interface.
#
This column displays the priorities of the group’s interfaces. The order of
the interfaces in the list is important since they are used in the order they
are listed.
Member
Click this icon to open a screen where you can select an interface to be a
group member.
Mode
Select
Active
to have the ZyWALL always attempt to use this connection.
Select
Passive
to have the ZyWALL only use this connection when all of
the connections set to active are down. You can only set one of a group’s
interfaces to passive mode.
Weight
This field displays with the weighted round robin load balancing
algorithm. Specify the weight (1~10) for the interface. The weights of the
different member interfaces form a ratio. This ratio determines how much
traffic the ZyWALL sends through each member interface. The higher an
interface’s weight is (relative to the weights of the interfaces), the more
traffic the ZyWALL sends through that interface.
Ingress
Bandwidth
This field displays with the least load first load balancing algorithm.
It
displays the maximum number of kilobits of data the ZyWALL is to allow
to come in through the interface per second.
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12.4
Trunk Technical Reference
Round Robin Load Balancing Algorithm
Round Robin scheduling services queues on a rotating basis and is activated only
when an interface has more traffic than it can handle. A queue is given an amount
of bandwidth irrespective of the incoming traffic on that interface. This queue then
moves to the back of the list. The next queue is given an equal amount of
bandwidth, and then moves to the end of the list; and so on, depending on the
number of queues being used. This works in a looping fashion until a queue is
empty.
Egress
Bandwidth
This field displays with the least load first or spillover load balancing
algorithm.It displays the maximum number of kilobits of data the
ZyWALL is to send out through the interface per second.
Spillover
This field displays with the spillover load balancing algorithm. Specify the
maximum bandwidth of traffic in kilobits per second (1~1048576) to
send out through the interface before using another interface. When this
spillover bandwidth limit is exceeded, the ZyWALL sends new session
traffic through the next interface. The traffic of existing sessions still goes
through the interface on which they started.
The ZyWALL uses the group member interfaces in the order that they are
listed.
OK
Click
OK
to save your changes back to the ZyWALL.
Cancel
Click
Cancel
to exit this screen without saving.
Table 75
Configuration > Network > Interface > Trunk > Add (or Edit) (continued)
LABEL
DESCRIPTION
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