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MPLS
default value of sample-multiplier (the value that would result from the no auto-bandwidth-
defaults command) is 1, which means the default sample interval is 300 seconds.
Over a longer period of time called the adjust interval the router keeps track of the maximum
average data rate recorded during any constituent sample interval. The adjust interval is the
product of adjust-multiplier and the collection-interval specified in the auto-bandwidth
accounting-policy. A default adjust-multiplier for all LSPs may be configured using the
config>router>mpls>auto-bandwidth-multiplier command but this value can be overridden on
a per-LSP basis at the config>router>mpls>lsp>auto-bandwidth context. The default value of
adjust-multiplier (the value that would result from the no auto-bandwidth-mulitplier command) is
288, which means the default adjust interval is 86400 seconds or 24 hours. The system enforces
the restriction that adjust-multiplier is equal to or greater than sample-multiplier. It is
recommended that the adjust-multiplier be an integer multiple of the sample-multiplier.
The collection-interval in the auto-bandwidth accounting policy can be changed at any time,
without disabling any of the LSPs that rely on that policy for statistics collection.
The sample-multiplier (at the mpls>auto-bandwidth level or the lsp>auto-bandwidth level) can
be changed at any time. This will have no effect until the beginning of the next sample interval. In
this case the adjust-interval does not change and information about the current adjust interval
(such as the remaining adjust-multiplier, the maximum average data rate) is not lost when the
sample-multiplier change takes effect.
The system allows adjust-multiplier (at the mpls level or the lsp>auto-bandwidth level) to be
changed at any time as well but in this case the new value shall have no effect until the beginning
of the next adjust interval.
Byte counts collected for LSP statistics include layer 2 encapsulation (Ethernet headers and
trailers) and therefore average data rates measured by this feature include Layer 2 overhead as
well.
Passive Monitoring of LSP Bandwidth
The system offers the option to measure the bandwidth of an RSVP LSP (see
Bandwidth on page
of how different the measured bandwidth is from the current reservation. Passive monitoring is
enabled using the config>router>mpls>lsp>auto-bandwidth>monitor-bandwidth command.
The show>router>mpls>lsp detail command can be used to view the maximum average data rate
in the current adjust interval and the remaining time in the current adjust interval.
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33) without taking any action to adjust the bandwidth reservation, regardless
7950 SR OS MPLS Configuration Guide
Measurement of LSP
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