Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 111
• Configure a LAG SAP aggregate rate of 200 Mb/s and a CIR of 100 Mb/s.
• To maintain the SLA, the SAP aggregate rate and CIR must be divided by the
number of operational links in the LAG group.
• Because there are two active ports (links) in this LAG, the H-QoS aggregate rate
and CIR are divided evenly between the two ports.
• The port 1/1/1 SAP scheduler (H-QoS) aggregate rate is 100 Mb/s and the CIR
is 50 Mb/s.
• The port 1/1/2 SAP scheduler (H-QoS) aggregate rate is 100 Mb/s and the CIR
is 50 Mb/s.
SLA distribution for Ingress MSS
• Configure a shaper group with an ID of 2 with an aggregate rate of 200 Mb/s and
a CIR of 100 Mb/s.
• Create a LAG SAP using shaper group 2 that has two ports from one MDA (for
example, ports 1/1/1 and 1/1/2) and three ports from a different MDA (for
example, ports 1/2/1, 1/2/2, and 1/2/3) in its LAG group.
• The ingress MSS scheduler rate is configured on an MDA basis. Adaptive QoS
divides the QoS rates among the active link MDAs, proportionally to the number
of active links on each MDA.
• For MDA 1, the MSS shaper group aggregate rate is 80 Mb/s and the CIR is
40 Mb/s (2/5 of the bandwidth with two active links on MDA 1).
• For MDA 2, the MSS shaper group aggregate rate is 120 Mb/s and the CIR is
60 Mb/s (3/5 of the bandwidth with three active links on MDA 2).
3.2.13.4 Access Ingress Fabric Shaping
In order to avoid traffic congestion and ease the effects of possible bursts, a fabric
shaper is implemented on each adapter card. Traffic being switched to a LAG SAP
on an access interface goes through fabric shapers that are either in aggregate mode
or destination mode. When in destination mode, the multipoint shaper is used to set
the rate on all adapter cards. For more information on the modes used in fabric
shaping, refer to the 7705 SAR Quality of Service Guide, “Configurable Ingress
Shaping to Fabric (Access and Network)”.
Note: Even though the multipoint shaper is used to set the fabric shaping rate for traffic
switched to a LAG SAP, it is the per-destination unicast counters that are incremented to
show the fabric statistics rather than the multipoint counter. Only the fabric statistics of the
active port of the LAG are incremented, not the standby port.
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