Alcatel-Lucent 7450 Manual page 38

Label Switching Routers
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.
Periodic Automatic Bandwidth Adjustment
Automatic bandwidth allocation is supported on any RSVP LSP that has MBB enabled. MBB is
enabled in the config>router>mpls>lsp context using the adaptive command. For automatic
adjustments of LSP bandwidth to occur the monitor-bandwidth command must not be present at
config>router>mpls>lsp>auto-bandwidth context, otherwise only passive measurements will
occur.
If an eligible RSVP LSP is configured for auto-bandwidth, by entering auto-bandwidth at the
config>router>mpls>lsp context, then the ingress LER decides every adjust interval whether to
attempt auto-bandwidth adjustment. The following parameters are defined:
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•
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Page 38
36) without taking any action to adjust the bandwidth reservation, regardless
current_bw — The currently reserved bandwidth of the LSP; this is the operational
bandwidth that is already maintained in the MIB.
measured_bw — The maximum average data rate in the current adjust interval.
signaled_bw — The bandwidth that is provided to the CSPF algorithm and signaled in the
SENDER_TSPEC and FLOWSPEC objects when an auto-bandwidth adjustment is
attempted.
min — The configured min-bandwidth of the LSP.
Measurement of LSP
7450 ESS MPLS Guide