Configuration Commands
Page 406 7750 SR OS Interface Configuration Guide
config>port>tdm>ds1>channel-group>cisco-hdlc
config>port>tdm>ds3>cisco-hdlc
config>port>tdm>e1>channel-group>cisco-hdlc
config>port>tdm>e3>cisco-hdlc
Description This command configures the number of keepalive intervals that must pass without receiving a
keepalive packet before the link is declared down. It is expected that the nodes at the two endpoints
of the cHDLC link are provisioned with the same values.
Default 3
down-count — Specifies the number of keep alive intervals that must pass without receiving a keep
alive packet before the link is declared down.
Values 3 — 16
encap-type
Syntax
encap-type {atm | bcp-null | bcp-dot1q | ipcp | ppp-auto | frame-relay | wan-mirror
|cisco-hdlc| cem}
Context config>port>tdm>ds1>channel-group
config>port>tdm>ds3
config>port>tdm>e1>channel-group
config>port>tdm>e3
Description This command configures the encapsulation method used to on the specified port, path, or channel.
This parameter can be set on both access and network ports.
When the encap-type is set to ATM the CRC, timeslots, scrambling (if applicable), and idle-cycle-
flags are set to ATM defaults respectively. When the encap-type is changed from ATM, those
parameters are set to their non-ATM defaults.
When the encap-type is ATM, ATM sub-layer verification (GR-1248-CORE, Generic Requirements
for Operations of ATM Network Elements (NEs)) is automatically enabled. When ATM PLCP cell
mapping is used, the results of this verification include:
• PLCP Severely Errored Framing Seconds
• PLCP Alarm State
• PLCP Unavailable Seconds Counter
When ATM direct cell mapping is used, the result of the verification includes:
• Out of Cell Delineation (OCD) event count. The OCD event count is described in RFC 2515,
Definitions of Managed Objects for ATM Management. Note that multiple events occurring
within a second will be counted as 1 event for ASAP MDAs as a result of a hardware limit.
• Loss of Cell Delineation defect/alarm. The LCD defect/alarm is defined in RFC 2515, Defini-
tions of Managed Objects for ATM Management. When a path is in an LCD defect state, the
path’s operational status will be down. When a path exits the LCD state, the path’s operational
status will change to up (assuming nothing else causes the path to stay down). A trap is raised to
indicate the LCD status change. Also, a P-RDI is sent to indicate the defect to the remote end.
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