Chapter 15: Interface IP Configuration
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 447
The LAG must be shut down before adding or removing any ports. Shutting down the link aggregate will bring down
the operational state of all ports included in the LAG; however, the admin state of ports is not affected by changing the
admin state of the link-aggregate port.
SFP+ transceivers — ARRIS does not support LAGs whose member ports use different types of SFPs. Because
performance of member ports using different types of SFPs is unpredictable, ARRIS supports having the same type of
SFP for all member ports of a LAG. See SFP Interfaces for a description of SFP models supported by the C4/c CMTS.
It is possible to change the admin state of an individual port that is a member of a LAG.
All IP/IPv6 (including access-lists) configuration must be removed from all sub-interfaces on a port before the port can
be added to a link-aggregate.
Link-Aggregate ports can be configured Static or LACP:
Static configuration is simply the configuration of a LAG without enabling LACP. Users opting for static
configuration should perform manual checks to ensure their LAGs are connected correctly. Static ports are
considered operational once the physical link is operational.
An LACP port is considered operational once the physical link is operational and the port has finished negotiating
via LACP with its peer.
The pre-defined minimum number of ports must be operational (min-links) before the link aggregate is considered
operational. If the number of operational links on the C4/c CMTS falls below the min-links requirement, then the LAG is
taken out of service.
If one or more ports of the LAG go out of service and the minimum links requirement is violated, then the LAG will be
taken out of service. If the operational state of the one or more OOS ports changes to in-service and the min-links
requirement is once again met, then the link-aggregate is restored to service.
Note: Both the C4/c CMTS and remote (i.e. partner) side must be configured with minimum links functionality enabled and
with the same number of minimum links for this requirement to be fully operational. For example, a LAG on the C4/c CMTS
may continue to receive traffic from a north-bound router even when the min-links requirement is violated locally.
LACP Forwarding
A LAG is said to be LACP forwarding when data traffic is being received and transmitted. A link can cease to be LACP
forwarding for a number of reasons including:
The link has been configured to be administratively down.
The link has been physically disconnected, e.g., the cable has been unplugged.
To Next Page
Loading...
