User`s manual

NPort S8000 Series Switch Featured Functions
6-20
Hello Time = 5 sec, Max. Age = 20 sec, and Forwarding Delay = 4 sec does not violate Eqs. 1 through 3, but
does violate Eq. 4, since in this case,
2 * (Hello Time + 1 sec) = 12 sec, and 2 * (Forwarding Delay – 1 sec) = 6 sec.
You can remedy the situation in many ways. One solution is simply to increase the Forwarding Delay value to
at least 11 sec.
HINT: Perform the following steps to avoid guessing:
Step 1: Assign a value to “Hello Time” and then calculate the left most part of Eq. 4 to get the lower limit of
“Max. Age”.
Step 2: Assign a value to “Forwarding Delay” and then calculate the right most part of Eq. 4 to get the upper
limit for “Max. Age”.
Step 3: Assign a value to “Forwarding Delay” that satisfies the conditions in Eq. 3 and Eq. 4.
Bandwidth Management
Using Bandwidth Management
In general, one host should not be allowed to occupy unlimited bandwidth, particularly when the device
malfunctions. For example, so-called “broadcast storms” could be caused by an incorrectly configured topology,
or a malfunctioning device. The NPort S8000 not only prevents broadcast storms, but can also be configured to
a different ingress rate for all packets, giving administrators full control of their limited bandwidth to prevent
undesirable effects caused by unpredictable faults.
Configuring Bandwidth Management
Traffic Rate Limiting Settings
Ingress
Setting Description Factory Default
Ingress rate Select the ingress rate for all packets from the following
options: not limited, 128K, 256K, 512K, 1M, 2M, 4M, 8M
N/A