7705 SAR Interfaces
114
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
3.2.13.8 LAG Support on Mixed-Generation Hardware
This section contains information on the following topics:
• LAG Configuration at SAP Level
• LAG Configuration at Port Level
3.2.13.8.1 LAG Configuration at SAP Level
The 6-port Ethernet 10Gbps Adapter card and the 7705 SAR-X are third-generation
(Gen-3) hardware components. All other Ethernet cards are second-generation
(Gen-2) adapter cards, except the 8-port Ethernet Adapter card, which is a
first-generation (Gen-1) adapter card. See Table 2 for a list of first-, second-, and
third-generation Ethernet adapter cards, ports, and platforms.
The 7705 SAR supports mix-and-match traffic management (TM) across LAG
members, where one member is a port on a Gen-3 adapter card or platform and the
other member is a port on either a Gen-2 or Gen-1 adapter card or platform.
Mix-and-match LAG does not apply to the 7705 SAR-X because it has only Gen-3
Ethernet ports.
For mix-and-match LAG TM scenarios, the 7705 SAR supports a generic QoS
configuration, where the operator can configure all the settings available on each
generation adapter card, but it is the card responsible for transporting traffic that
determines which settings are applicable. That is, only the settings that apply to the
active member port are used. The only exception is if there is a Gen-1 adapter card
in the mix. In this case scheduling-mode cannot be changed to 16-priority
scheduling. Only 4-priority scheduling is applicable.
For example, configuring scheduling-mode applies to Gen-2 adapter card SAPs but
does not apply to the Gen-3 adapter card SAPs because Gen-3 cards support only
one scheduling mode (4-priority), which is its implicit (default) scheduler mode and is
not configurable. In another example, although per-SAP (second-tier) shaper rates
can be configured for Gen-2 and Gen-3 cards, they will not be applied to Gen-1
cards.
Since it cannot be known whether SAP traffic rides over a Gen-2 or a Gen-3 adapter
card and whether both adapter cards support H-QoS (tier 2, per-SAP shapers), the
operator can choose to configure per-SAP aggregate CIR and PIR shaper rates.
When the active link is on a Gen-2- or Gen-3-based port, per-SAP aggregate CIR
and PIR rates are both used to enforce shaper rates, except when the active link is
on a Gen-3-based port and traffic is in the network egress direction. In this case, only
the PIR portion of the per-SAP aggregate rate is used to enforce shaper rates.
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