Port Link Damping
Page 50 7210 SAS M, T, X, R6, R12, Mxp, S, Sx Interface Configuration Guide
then policy is applied each IMM individually, and the policer on each IMM allows a maximum of
100Mbps for a total of 200Mbps.
In 7210 SAS-R6 and 7210 SAS-R12, SAP egress QoS policy shaper parameters are applied to all
the ports that are members of the LAG (all ports get the full SLA), irrespective of whether they are
located on a single IMM or two different IMMs. For example, if an SAP egress policy is
configured with a shaper of PIR 100Mbps, each port would get a PIR of 100Mbps. The advantage
of this method over a scheme where the PIR is divided equally among all the member ports of the
LAG is that, a single flow can uses the entire SLA. The disadvantage is that the overall SLA can
be exceeded if the flows span multiple ports.
In 7210 SAS-R6 and 7210 SAS-R12, network port egress QoS policy shaper parameters are
applied to all the ports that are members of the LAG (all ports get the full SLA), irrespective of
whether they are located on a single IMM or two different IMMs.. For example, if an network port
egress policy is configured with a shaper of PIR 100Mbps, each port would get a PIR of 100
Mbps. The advantage of this method over a scheme where the PIR is divided equally among all the
member ports of the LAG is that, a single flow can uses the entire SLA. The disadvantage is that
the overall SLA can be exceeded if the flows span multiple ports.
Port Link Damping
Hold time controls enable port link damping timers that reduce the number of link transitions
reported to upper layer protocols.
The 7210 SAS OS port link damping feature guards against excessive port transitions. Any initial
port transition is immediately advertised to upper layer protocols, but any subsequent port
transitions are not advertised to upper layer protocols until a configured timer has expired.
An “up” timer controls the dampening timer for link up transitions, and a “down” timer controls
the dampening timer for link down transitions.
LACP
Generally, link aggregation is used for two purposes: provide an increase in bandwidth and/or
provide redundancy. Both aspects are addressed by aggregating several Ethernet links in a single
LAG.
Under normal operation, all non-failing links in a given LAG will become active and traffic is load
balanced across all active links. In some circumstances, however, this is not desirable. Instead, it
desired that only some of the links are active and the other links be kept in stand-by condition.
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