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BLADEOS 6.5.2 Application Guide
208 Chapter 14: FCoE and CEE BMD00220, October 2010
Allocating Bandwidth
Allocated Bandwidth for PGID 0 Through 7
The administrator may allocate a portion of the switch’s available bandwidth to PGIDs 0 through 7.
Available bandwidth is defined as the amount of link bandwidth that remains after priorities within
PGID 15 are serviced (see “Unlimited Bandwidth for PGID 15” on page 208), and assuming that all
PGIDs are fully subscribed. If any PGID does not fully consume its allocated bandwidth, the
unused portion is made available to the other priority groups.
Priority group bandwidth allocation can be configured using the following command:
where bandwidth allocation represents the percentage of link bandwidth, specified as a number
between 0 and 100, in 10% increments.
The following bandwidth allocation rules apply:
Bandwidth allocation must be 0% for any PGID that has no assigned 802.1p priority values.
Any PGID assigned one or more priority values must have a bandwidth allocation greater than 0%.
Total bandwidth allocation for groups 0 through 7 must equal exactly 100%. Increasing or
reducing the bandwidth allocation of any PGID also requires adjusting the allocation of other
PGIDs to compensate.
The total bandwidth allocated to all PGIDs which include priority values where PFC is disabled
should not exceed 50%.
If these conditions are not met, the switch will report an error when applying the configuration.
To achieve a balanced bandwidth allocation among the various priority groups, packets are
scheduled according to a weighted deficit round-robin (WDRR) algorithm. WDRR is aware of
packet sizes, which can vary significantly in a CEE environment, making WDRR more suitable
than a regular weighted round-robin (WRR) method, which selects groups based only on packet
counts.
Note – Actual bandwidth used by any specific PGID may vary from configured values by up to
10% of the available bandwidth in accordance with 802.1Qaz ETS standard. For example, a setting
of 10% may be served anywhere from 0% to 20% of the available bandwidth at any given time.
Unlimited Bandwidth for PGID 15
PGID 15 is permitted unlimited bandwidth and is generally intended for critical traffic (such as
switch management). Traffic in this group is given highest priority and is served before the traffic in
any other priority group.
RS G8124(config)# cee global ets bandwidth <priority group number>
<bandwidth allocation>