User's Manual

Chapter 13 Trunks
ISG50 User’s Guide
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13.4 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.
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 ISG50 always attempt to use this connection.
Select Passive to have the ISG50 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 ISG50 sends
through each member interface. The higher an interface’s weight is (relative to the
weights of the interfaces), the more traffic the ISG50 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 ISG50 is to allow to come in through the
interface per second.
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 ISG50 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 ISG50 sends new session traffic through the next
interface. The traffic of existing sessions still goes through the interface on which
they started.
The ISG50 uses the group member interfaces in the order that they are listed.
OK Click OK to save your changes back to the ISG50.
Cancel Click Cancel to exit this screen without saving.
Table 85 Configuration > Network > Interface > Trunk > Add (or Edit) (continued)
LABEL DESCRIPTION