Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 435
encap-type
Syntax encap-type {atm | ppp-auto}
Context config>port>sonet-sdh>path
Description This command configures the encapsulation method used to distinguish customer traffic on
a SONET/SDH path on a 4-port OC3/STM1 Clear Channel Adapter card.
The encap-type of atm is used for access mode, and the encap-type of ppp-auto is used for
network mode.
When encap-type is atm, the crc default of 32 cannot be changed.
When encap-type is atm, ATM sublayer verification specified in GR-1248-CORE, Generic
Requirements for Operations of ATM Network Elements, is automatically enabled. 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. Multiple events occurring
within 1 s will be counted as one event for ATM and ASAP adapter cards as a result of
a hardware limit.
• Loss of Cell Delineation (LCD) defect/alarm — the LCD defect/alarm is defined in RFC
2515, Definitions of Managed Objects for ATM Management. When a path is in an LCD
defect state, the path’s operational status is 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, and a Path Remote
Defect Indicator (PRDI) is sent to indicate the defect to the remote end.
To change the encap-type, the path must first be removed and then recreated with the new
encap-type. For example, to change the encap-type from atm to ppp-auto:
config>port>sonet-sdh>path# back
config>port>sonet-sdh# no path
config>port>sonet-sdh# path
config>port>sonet-sdh>path# mode network
config>port>sonet-sdh>path# encap-type ppp-auto
config>port>sonet-sdh>path#
Default no encap-type
Parameters atm — specifies that the encapsulation on the port is ATM
ppp-auto — enables PPP on the associated port or channel. The activation of IPCP and
MPLSCP is automatic depending on the protocol configuration.
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