Nortel Networks WEB OS 212777 - Manual (Page 452)

Web OS 10.0 Application Guide
452 n Chapter 17: Bandwidth Management
212777-A, February 2002
Bandwidth Statistics and History
Statistics are maintained in order to allow Web switch owners to bill for bandwidth usage. Sta-
tistics for frequency and count are configurable. Statistics are kept in the individual Switch
Processors (SP) and then collected every second by the MP (Management Processor). The MP
then combines the statistics, as statistics for some classifications may be spread across multiple
SPs.
The MP maintains some global statistics, such as total octets and a window of historical statis-
tics. When the history buffer of 128K is ready to overflow, it can be optionally e-mailed to a
user for long-term storage. Additionally, the history buffer can be sent to the user when the
user enters the command:
/oper/bwm/sndhist. The SMTP protocol is used for this
transfer if the SMTP host has been configured (/ cfg/sys/smtp ) and the user e-mail address
has been set up (/ cfg/bwm/user ). To obtain graphs, the data must be collected and pro-
cessed by an external entity through SNMP or through e-mailed logs.
History is maintained only for the contracts for which the history option is enabled
(
/cfg/bwm/cont x/hist ).
If SMTP is enabled, then the info command ( /info/bwm ) can display when the history sta-
tistics will be e-mailed to a user.
Statistics Maintained
The total number of octets sent, octet discards, and times over the soft limit are kept for each
contract. The history buffer maintains the average queue size for the time interval and the aver-
age rate for the interval.
Statistics and Management Information Bases
n
For existing BWM classes:
As mentioned above, the MP maintains per-contract rate usage statistics. These are obtain-
able via a private MIB.
n
When BWM services are not enabled:
Even when BWM is not enforced, the MP can still collect classification information and
report it, allowing the customer to observe a network for a while before deciding how to
configure it. This feature can be disabled using
/cfg/bwm/force dis . When this
command is used, no limits will be applied on any contract.