Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 115
In the following descriptions of LAG configuration, scheduler-mode, agg-rate, and
cir-rate refer to SAP configuration, as shown below for an Epipe SAP. Similar
commands exist for SAPs in other services as well as for egress traffic.
config>service>epipe>sap lag-id>ingress#
scheduler-mode {4-priority | 16-priority}
agg-rate-limit agg-rate [cir cir-rate]
For information on traffic management for Gen-3 adapter cards and platforms, refer
to the “QoS for Gen-3 Adapter Cards and Platforms” section in the 7705 SAR Quality
of Service Guide.
For mix-and-match LAG configurations, the following behaviors apply.
• The configured aggregate rate on the LAG SAP is used to dictate the per-SAP
aggregate rate on the active LAG port, regardless of which generation of adapter
card is used (Gen-3 or Gen-2) or the configured scheduler mode. On a Gen-2
adapter card, the aggregate rate only applies when the port is in 16-priority
scheduler mode. This behavior implies the following points.
− The scheduler mode can be set to 16-priority or 4-priority. When servicing
packets, the Gen-2-based datapath uses the configured scheduler mode
(16-priority or 4-priority), while the Gen-3-based datapath always uses
4-priority scheduling.
− When the traffic is transported over a Gen-3-based port (that is, the active
link is on a Gen-3-based adapter card), the aggregate rate (agg-rate) is
used to enforce a maximum shaper rate, as is the aggregate rate CIR
(cir-rate).
− When the active link is on a Gen-2-based adapter card, both aggregate rate
CIR and PIR (cir-rate and agg-rate) are used. The aggregate rate (PIR)
enforces the per-SAP bandwidth limit, and the CIR is used to identify
in-profile and out-of-profile packets for aggregate scheduling purposes.
− When the active link is on a Gen-1-based adapter card, aggregate rate CIR
and PIR do not apply.
In addition, the following items describe mix-and-match LAG configuration behavior
(that is, how the LAG SAP settings are applied or ignored depending on the active
member port).
Note:
• The SAP identifier in the previous command has a lag-id (LAG SAP), not a port-id
(regular SAP). A LAG SAP references two ports (one active and one standby), but only
one port at a time carries traffic.
• The agg-rate is a PIR rate.
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