没有合适的资源?快使用搜索试试~ 我知道了~
资源推荐
资源详情
资源评论
ATM Traffic Management
• Traffic Management Roles:
– Maximize efficiency
– Minimize data loss
– Control traffic during times of heavy utilization
• Control is based on:
– Connection Admission Control (CAC)
– Call Routing
– Network Resource Allocation
Traffic management capabilities:
Requireme
nts
ATM TCP/IP
QoS
Signaling
Sig 4.0 RSVP or IP
Precedenc
e
QoS
Routing
PNNI 1.0 None
Explicit
Rate Flow
Control
TM 4.0 None
• Improvements over initial design:
– Slow start (provides for an exponential growth
in TCP Window size )
– Fast Retransmit and Fast Recovery (controls
de detection of loss and retransmission of
packets)
– MTU discovery (allows for a larger MTU)
– Random Early Detection (prevents flow
synchronization reducing queuing)
TCP flow control
Effect of cell loss
• Effect on TCP
1/(1+2pw) p – loss probability
w – bandwidth-delay product
Ex:
155 Mbps LAN (1km dim) 0.1% loss => 99% of rated
TCP throughput
WAN (delay>20ms) 622Mbps 0.001% => 35%
throughput degradation
• In ATM a cell loss means entire higher-layer
frame loss
– Early Packet Discard (Sun)
剩余20页未读,继续阅读
资源评论
UncommenPlaces
- 粉丝: 0
- 资源: 32
上传资源 快速赚钱
- 我的内容管理 展开
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功