Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 103
• LACP and Active/Standby Operation
• QoS Adaptation for LAG on Access
• Access Ingress Fabric Shaping
• Hold-down Timers
• Multi-Chassis LAG
• Static LAG (Active/Standby LAG Operation without LACP)
• LAG Support on Mixed-Generation Hardware
3.2.13.1 LAG Overview
The 7705 SAR supports Link Aggregation Groups (LAGs) based on the IEEE
802.1ax standard (formerly 802.3ad). Link aggregation provides:
• increased bandwidth by combining multiple links into one logical link (in
active/active mode)
• load sharing by distributing traffic across multiple links (in active/active mode)
• redundancy and increased resiliency between devices by having a standby link
to act as backup if the active link fails (in active/standby mode)
In the 7705 SAR implementation, all links must operate at the same speed.
Packet sequencing must be maintained for any given session. The hashing algorithm
deployed by Nokia routers is based on the type of traffic transported to ensure that
all traffic in a flow remains in sequence while providing effective load sharing across
the links in the LAG. See LAG and ECMP Hashing for more information.
LAGs must be statically configured or formed dynamically with Link Aggregation
Control Protocol (LACP). See LACP and Active/Standby Operation for information
on LACP.
All Ethernet-based supported services can benefit from LAG, including:
• network interfaces and SDPs
• spoke and mesh SDP terminations
• IES and VPRN interfaces and SAPs
• Ethernet and IP pseudowire SAPs
• routed VPLS (r-VPLS) SAPs
LAGs are supported on access, network, and hybrid ports. A LAG can be in
active/active mode or in active/standby mode for access, network, or hybrid ports.
Active/standby mode is a subset of active/active mode if subgroups are enabled.
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