12-14 Cisco BPX 8600 Series Reference
Functional Description
OAM Cell Support
OAM cells are detected and transmitted by the ASI-1 firmware. System software displays alarm
indications detected by the firmware. Additionally, loopbacks between the ATM-UNI and the
ATM-CPE can be established. ForeSight round-trip delay cells are generated by firmware upon
software request.
System software deals with the following OAM cell flows:
• End-to-End AIS/FERF—software displays on a per-connection basis.
• External segment loopbacks—software initiates loopback of ATM-CPE via user command. The
SAR creates the loopback OAM cell. External loopback cells received from the ATM-CPE are
processed by the SAR.
• Internal ForeSight round trip delay—software commands the ASI-1 to measure the RTD
excluding trunk queueing delay on each ForeSight connection. Software displays the result.
• Internal loopback round trip delay—software commands the ASI-1 to measure the RTD
including trunk queueing delay on each ForeSight connection. Software displays the result.
• Internal Remote Endpoint Status—these cells are generated by one end of a connection due to
remote network connection failure (A-bit = 0). The other end ASI-1 detects these cells and
reports the connection status to software, which displays it.
The following user commands are associated with OAM cell status changes:
• dspalms
• dspcon
• dspport
• tstconseg
• tstdly
Diagnostics
Loopbacks
• Local loopbacks loop data back to the local ATM-TE, via the local BPX switch. Remote
loopbacks loop data back to the local ATM-TE, via the whole connection route up to and
including the remote terminating card.
• Local and remote connection loopbacks, and local port loopbacks, are destructive.
Card Tests
• The generic card selftest mechanism on the BPX switch is modified to include the ASI-1 card.
• The card background test that exists for the FRP card on the IPX switch is modified to work for
the ASI-1 card.
Connection Tests
• The tstcon command is not supported. The tstdly command is used for connection continuity
testing. ASI-1 tstdly is non-destructive, as compared with the IPX switch tstdly.
