Traffic Management
135
Traffic
Management
The CoreBuilder 7000 family ATM switch provides several traffic
management services for handling congestion including:
Frame Discard Capability
EFCI
Frame Discard
Capability
The CoreBuilder 7000 ATM switch can discard cells at the frame (AAL
protocol data unit) level. The switch detects the frame boundaries by
examining the SDU-type in the payload type field of the ATM cell header.
The CoreBuilder 7000 ATM switch can perform the following:
Pass the frame discard indication towards the network
If indication cannot be transported over the output interface (UNI 3.*)
frame discard is not performed.
Discarding Frames for an SVC
The calling party encodes instructions about frame discard in the framed
discard bit in the SETUP message and the called party does the same in
the CONNECT message. The switch generally passes this information
along to an end user but, in certain circumstances, the switch can choose
to drop frames. This can happen in the circumstances shown in Table 35:
EFCI
The CoreBuilder 7000 family ATM switch supports a rate-based algorithm
with Explicit Forward Congestion Indication (EFCI).
Table 35
Discarding Frames
Message
Received
Coding
Action
SETUP
The forward frame discard bit
is coded to frame discard
allowed
Pass this indication towards
called party.
Can perform frame discard for
the forward direction of the
connection
Indication of backward frame
discard allowed
Pass this indication towards
called party
CONNECT
The backward frame discard
indication is coded to frame
discard allowed
Pass this indication towards
calling party
Can perform frame discard for
the backward direction of the
connection
Summary of Contents for CoreBuilder 7000
Page 12: ......
Page 30: ...30 CHAPTER 1 ATM NETWORK BASICS...
Page 32: ...32 CHAPTER 1 ATM NETWORK BASICS...
Page 34: ...34 CHAPTER 1 ATM NETWORK BASICS Figure 8 LANE Network over WAN...
Page 96: ...96 CHAPTER 4 PRIVATE NETWORK TO NETWORK INTERFACE PNNI VERSION 1 0...
Page 184: ...184 CHAPTER 7 LAN EMULATION VERSIONS 1 0 AND 2 0...
Page 206: ...206 CHAPTER 9 DEVICE MANAGEMENT...
Page 222: ...222 APPENDIX A TECHNICAL SUPPORT...
Page 234: ...234 APPENDIX B PROTOCOLS AND INTERFACES...
Page 238: ...238 APPENDIX C COREBUILDER 7000 FAMILY ATM SWITCH SPECIFICATIONS...
Page 242: ...242 APPENDIX D SAFETY INFORMATION...