Cisco WS-C4507R User Manual

© 2004 Cisco Systems, Inc. All rights reserved. Printed in USA.
Presentation_ID.scr
434343
© 2004 Cisco Systems, Inc. All rights reserved.
RST-3508
9805_05_2004_c2
Stub ASIC Overview
• Fans out GigE ports from
switch fabric
• Up to 8 front-panel ports;
10/100, 1000-only, or
10/100/1000
• Flow control on gigabit
interfaces
• Ports can be used in an
EtherChannel
• Not always oversubscribed
e.g. 10/100
GbE to/from
Switch Fabric
Up to 8 Front-Panel
Ports, 10/100/1000
444444
© 2004 Cisco Systems, Inc. All rights reserved.
RST-3508
9805_05_2004_c2
Port Rx-No-Pkt-Buff RxPauseFrames TxPauseFrames PauseFramesDrop
Gi4/7 0 35648 4854 0
IEEE 802.3x Flow Control
• Standards-based mechanism used to control data flow
• Basic steps
1) Data flows to switch
2) Switch congested so “pause” frame sent
3) End station waits required time before sending
4) IOS supervisors support both Tx and Rx pause frames
Gigabit Ethernet
Switch
1. Data Flows
to Switch
2. Switch Congested
“Pause” Frame Sent
3. End Station Waits
Required Time
Before Sending
File Server

Cisco WS-C4507R Specifications

General

Brand	Cisco
Model	WS-C4507R
Category	Network Router
Language	English