
© 2012 Cisco and/or its affiliates. All rights reserved.
Presentation_ID
Cisco Public
© 2013 Cisco and/or its affiliates. All rights reserved.
BRKARC-3470 Cisco Public
21
40G Port
Ingress Modules
10G 10G 40G 40G 100G
Spines
Spines
Spines
Spines
Fabrics
40G and 100G Flow Limits – Internal versus “On the Wire”
• Each VQI sustains 10-12G traffic flow
• Single-flow limit is ~10G
• Packets split into 66-bit “code words”
• Four code words transmitted in parallel, one on each
physical Tx fibre
• No per-flow limit imposed – splitting occurs at physical layer
Egress Interfaces
Destination
VQIs
1 VQI 1 VQI 4 VQIs 4 VQIs 10 VQIs
Internal to Nexus 7000 System
n … 4 3 2 1
64 bits
1 packet
On the Wire (40G)
Tx 1
Tx 2
Tx 3
Tx 4
66 bits
1 5
2
3
4
6
…
64/66B Encoding
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