Alcatel-Lucent 7750 SR OS, Interface Configuration Manual

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Interface Configuration
7750 SR OS Interface Configuration Guide Page 75
become stand-by and lag-members connected to other IOM will become active. This way, QoS
enforcement constraints are respected, while the maximum of available links is utilized.
Figure 15: LAG on Access Interconnection
Figure 16: LAG on Access Failure Switchover
LACP is used to make selection of active links predictable and compatible with any vendor
equipment. Refer to the IEEE STD 802.3-2002, Section 3, Clause 43.6.1 standard which describes
how LACP allows stand-by and active signalling.
The 7750 SR OS7450 ESS OS implementation of LACP supports the following:
• You can assign a given LAG member to sub-groups. The selection algorithm then assures
that only members of a single sub-group are selected as active links.
• The selection algorithm is effective only if LACP is enabled on a given LAG. At the same
time, it is assumed that connected system has also LACP enabled (active or passive
mode).
• The algorithm will select active links based on following criteria:
→
Depending on selection-criteria setting either the sub-group with the highest number
of eligible links or the sub-group with the highest aggregate weight of all eligible
members is selected first.
DSLAM
Lag Stby
Active
OSSG095
HGW
HGW
Provider
Network
PE
IOM-A
IOM-B
DSLAM
Lag
Stby
Active
OSSG096
HGW
HGW
Provider
Network
PE
IOM-A
IOM-B