Cisco RF Gateway 1 Modules, Configuration Manual

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Chapter 8 M-CMTS Data DEPI-CP Operation
138 78-4025112-01 Rev H0
DEPI Feature Highlights
Data plane extension during PRE - SSO
DEPI control and session will be renegotiated on the secondary PRE after SO. The
Dataplane on the RFGW1 should continue to forward data traffic, SYNC’s,
MAP/UCD for up for 60 seconds although the control plane is down, to allow traffic
to flow during the PRE SO. . Note the sessions as observed on the Monitor->session
page would be moved to Del-Wait state. Once the new DEPI control and session are
established, the Data plane can be reprogrammed.
The idea is to make sure the modems stay online and there is no disruption in the
traffic during a PRE SO.
DEPI Path Redundancy
DEPI Path Redundancy is a method for creation and management of redundant
DEPI connections between the M-CMTS Core and the EQAM. The high availability
requirements demands that the CMTS’s architecture must avoid single points of
failure through support for redundant sub-components involved in DEPI and the
ability to operate with redundant DEPI connections.
DPR introduces two types of DEPI data sessions: primary sessions and secondary
sessions. DPR provides redundancy at the data session level. Primary sessions are
used to transport encapsulated DOCSIS data under normal conditions. Primary
sessions are equivalent to generic DEPI sessions, when DPR is not supported. A
secondary session serves as always-ready substitute for a primary session associated
with the same QAM channel. A secondary session can be utilized to carry DEPI data
when the associated primary session becomes unavailable as result of a failure or an
operator action
Note: The Monitor->Depi details -> Statistics page indicates the session type that is
currently active on a specific QAM channel.