Users Guide

• If an IP header is not found after the fifth label, hashing is based on the MPLS labels.
• If the packet has more than five MPLS labels, hashing is based on the source and destination MAC
address.
To enable this type of hashing, use the default CAM profile with the microcode lag-hash-mpls.
LAG Hashing Based on Bidirectional Flow
To hash LAG packets such that both directions of a bidirectional flow (for example, VoIP or P2P file
sharing) are mapped to the same output link in the LAG bundle, use the default CAM profile with the
microcode lag-hash-align.
Unified Forwarding Table (UFT) Modes
Unified Forwarding Table (UFT) consolidates the resources of several search tables (Layer 2, Layer 3
Hosts, and Layer 3 Route [Longest Prefix Match — LPM]) into a single flexible resource. Dell Networking
OS supports several UFT modes to extract the forwarding tables, as required. By default, Dell Networking
OS initializes the table sizes to UFT mode 2 profile, since it provides a reasonable shared memory for all
the tables. The other supported UFT modes are scaled-l3–hosts (UFT mode 3) and scaled-l3–routes (UFT
mode 4).
Table 10. UFT Modes —Table Size
UFT Mode L2 MAC Table Size L3 Host Table Size L3 LPM Table Size
Default 160K 144K 16K
Scaled-l3-hosts 96K 208K 16K
Scaled-l3-routes 32K 16K 128K
NOTE: On the C9010, OpenFlow supports only the scaled-l3-hosts hardware forwarding-table
mode (UFT mode 3), providing a unified forwarding table (UFT) of:
• L2 MAC entries: 160K
• L3 host entries: 144K
• L3 route entries: 16K
OpenFlow does not support the scaled-l3-routes forwarding-table mode (UFT mode 4) on the
C9010.
Configuring UFT Modes
To configure the Unified Forwarding Table (UFT) modes, follow these steps.
1. Select a mode to initialize the maximum scalability size for L2 MAC table or L3 Host table or L3 Route
table.
CONFIGURATION
hardware forwarding-table mode
Dell(conf)#hardware forwarding-table mode ?
scaled-l3-hosts Forwarding table mode for scaling L3 host entries
scaled-l3-routes Forwarding table mode for scaling L3 route entries
Dell(conf)#
Content Addressable Memory (CAM)
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