Cisco N7K-C7009 Manuel d'utilisateur Page 20

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© 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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