7705 SAR Interfaces
502
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
Description This command specifies how active/active LAG SAP queue scheduler, SAP scheduler
(H-QoS), and SAP MSS scheduler QoS rates (as specified by the SLA) are distributed to
each of the active LAG ports. This command applies only to access LAGs.
Default link
Parameters link — specifies that the full QoS rates are configured on each of the active LAG links for
SAP queue schedulers, SAP schedulers (H-QoS), and SAP MSS schedulers
distribute — specifies that the QoS rates are divided equally among the active LAG links
for SAP queue schedulers, SAP schedulers (H-QoS), and egress MSS schedulers.
For ingress MSS shaper schedulers, the distribute parameter specifies that the QoS
rates are divided proportionally among the active link MDAs based on the number of
active links on each MDA.
dynamic-cost
Syntax [no] dynamic-cost
Context config>lag
Description This command enables OSPF or IS-IS costing of a LAG based on the available aggregated,
operational bandwidth.
The path cost is dynamically calculated based on the interface bandwidth. OSPF path cost
can be changed through the interface metric or the reference bandwidth.
If dynamic cost is configured, costing is applied based on the total number of links configured
and the cost advertised is inversely proportional to the number of links available at the time.
This requires that the number of links that are up exceeds the configured LAG threshold
value; if the number of links that are up falls below the threshold, the configured threshold
action determines whether, and at what cost, this LAG will be advertised (see port-threshold).
For example, a physical link in OSPF has a cost associated with it of 100, and the LAG
consists of four physical links. The cost associated with the logical link is 25. If one link fails,
the cost is automatically adjusted to 33.
If dynamic cost is not configured and OSPF auto-cost is configured, costing is applied based
on the total number of links configured. This cost will remain static provided that the number
of links that are up exceeds the configured LAG threshold value; if the number of links that
are up falls below the threshold, the configured threshold action determines whether, and at
what cost, this LAG will be advertised.
If dynamic cost is configured and OSPF auto-cost is not configured, the cost is determined
by the cost configured on the OSPF metric, provided that the number of links that are up
exceeds the configured LAG threshold value; if the number of links that are up falls below the
threshold, the configured threshold action determines whether this LAG will be advertised.
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