Management and Configuration Guide K/KA/KB.15.15

NOTE: Configuring 0% for a queue can result in that queue being starved if any higher queue
becomes over-subscribed and is then given all unused bandwidth.
The switch applies the bandwidth calculation to the link speed the port is currently using. For
example, if a 10/100 Mbs port negotiates to 10 Mbps on the link, it bases its GMB calculations
on 10 Mbps, not 100 Mbps.
Use show bandwidth output<port-list> to display the current GMB configuration. (The
show config and show running commands do not include GMB configuration data.)
Example
For example, suppose you want to configure the following outbound minimum bandwidth availability
for ports A1 and A2:
Effect on outbound bandwidth allocationMinimum
bandwidth %
Priority of
outbound port
queue
Queue 8 has the first priority use of all outbound bandwidth not specifically allocated
to queues 1 to 7.
20%8
If, for example, bandwidth allocated to queue 5 is not being used and queues 7
and 8 become oversubscribed, queue 8 has first-priority use of the unused bandwidth
allocated to queue 5.
Queue 7 has a GMB of 15% available for outbound traffic. If queue 7 becomes
oversubscribed and queue 8 is not already using all of the unallocated bandwidth,
queue 7 can use the unallocated bandwidth.
15%7
Also, any unused bandwidth allocated to queues 6 to queue 1 is available to queue
7 if queue 8 has not already claimed it.
Queue 6 has a GMB of 10% and, if oversubscribed, is subordinate to queues 8
and 7 in priority for any unused outbound bandwidth available on the port.
10%6
Queue 5 has a GMB of 10% and, if oversubscribed, is subordinate to queues 8,
7, and 6 for any unused outbound bandwidth available on the port.
10%5
Queue 4 has a GMB of 10% and, if oversubscribed, is subordinate to queues, 8,
7, 6, and 5 for any unused outbound bandwidth available on the port.
10%4
Queue 3 has a GMB of 30% and, if oversubscribed, is subordinate to queues, 8,
7, 6, 5, and 4 for any unused outbound bandwidth available on the port.
30%3
Queue 2 has a GMB of 3% and, if oversubscribed, is subordinate to queues, 8, 7,
6, 5, 4, and 3 for any unused outbound bandwidth available on the port.
3%2
Queue 1 has a GMB of 2% and, if oversubscribed, is subordinate to all the other
queues for any unused outbound bandwidth available on the port.
2%1
Either of the following commands configures ports A1 through A5 with bandwidth settings:
HP Switch(config) # int a1-a5 bandwidth-min output 2 3 30 10 10 10 15 strict
HP Switch(eth-A1-A5) # bandwidth-min output 2 3 30 10 10 10 15 strict
Viewing the current GMB configuration
This command displays the per-port GMB configuration in the running-config file.
Syntax
show bandwidth output <port-list>
Without port-list, this command lists the GMB configuration for all ports on the switch.
With port-list, this command lists the GMB configuration for the specified ports.
Configuring Guaranteed Minimum Bandwidth (GMB) for outbound traffic 179