
© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Public
Presentation_ID
28
Backpressure and VoQ Mechanism
Egress NP congestion backpressure to ingress FIA
Packet is en-queued in the dedicated VoQ
No impact of the packet going to different egress NP
No head-of-line-block issue
Ingress side of LC1
Egress side of LC2
NP0
PHY
NP2
PHY
NP3
PHY
NP1
PHY
FIA
CPU
NP0PHY
NP2PHY
NP3PHY
NP1PHY
FIA
CPU
1
3
2
Backpressure: egress NP egress FIA
fabric Arbiter ingress FIA VoQ
Switch
Fabric
VoQ Scale: Each
FIA has P1/P2/BE
queue set for every
NP and RSPs in the
entire system
5Gbps
10Gbps
5Gbps
Packet going to different egress NP put into different VoQ set
Congestion on one NP won’t block the packet going to different NP
Kommentare zu diesen Handbüchern