Cisco WS-C4507R User Manual

© 2004 Cisco Systems, Inc. All rights reserved. Printed in USA.
Presentation_ID.scr
119119119
© 2004 Cisco Systems, Inc. All rights reserved.
RST-3508
9805_05_2004_c2
Dynamic Buffer Limiting (DBL)
• Congestion avoidance technique
• Flow based and maintains flow table per queue
• Operates by tracking buffer usage and credits
• If buffer usage exceeds dynamically computed
limit, DBL can either drop or set explicit congestion
notification
• Implemented in Cisco IOS supervisor hardware with
line-rate performance
• The default DBL computation is very reliable; the
rule is not to tune the algorithm unless it is really
required and the reason understood
120120120
© 2004 Cisco Systems, Inc. All rights reserved.
RST-3508
9805_05_2004_c2
Time
BUFFERS
CREDITS
Aggressive
Credit
Limit 10
Aggressive
Buffer Limit
2 Pkts
DBL
T0 T1 T2 T3 T4
FLOW
Drop One
Packet
Classified NAF
Max Credits
15 (Default)
Dynamic Buffer Limiting
NAF: Non Adaptive Flow

Cisco WS-C4507R Specifications

General

Brand	Cisco
Model	WS-C4507R
Category	Network Router
Language	English