Interface Configuration
7750 SR Interface Configuration Guide Page 463
to WAN.
Default plcd traps are not issued
crc
Syntax crc {16 | 32}
Context config>port>sonet-sdh>path
Description A 16 bit CRC can only be configured on an OC-3 channel, all other channel speeds must use a 32 bit CRC
except for the paths configured with encap-type atm at OC3 speed.
Default 16 for OC-3, DS-1, DS-3
32 for OC-12, OC-48, ATM-OC12/3, ATMOC-3, etc.
Note: The CRC default is 32 when the encap-type is set to ATM and also, the default cannot be changed
when the encap-type is set to ATM.
Parameters 16 — Use 16 bit checksum for the associated port/channel.
32 — Use 32 bit checksum for the associated port/channel.
encap-type
Syntax encap-type {atm | bcp-null | bcp-dot1q | ipcp | ppp-auto | frame-relay | wan-mirror | cisco-
hdlc}
Context config>port>sonet-sdh>path
Description This command configures the encapsulation method used to distinguish customer traffic on an access
SONET/SDH channel sub-port.
When the encap-type is set to ATM the CRC default cannot be changed.
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. 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 ATM and ASAP MDAs as a result of a hardware limit.
• Loss of Cell Delineation 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 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.
The encap-type is only required when configuring a SONET/SDH path for access mode.
The no form of this command restores the default.
To Next Page
Loading...
