Administrator Guide

Applications for CAM Profiling
The following describes link aggregation group (LAG) hashing.
LAG Hashing
The Dell Networking OS includes a CAM profile and microcode that treats MPLS packets as non-IP packets. Normally, switching and LAG
hashing is based on source and destination MAC addresses. Alternatively, you can base LAG hashing for MPLS packets on source and
destination IP addresses. This type of hashing is allowed for MPLS packets with five labels or less.
MPLS packets are treated as follows:
• When MPLS IP packets are received, the system looks up to five labels deep for the IP header.
• When an IP header is present, hashing is based on IP three tuples (source IP address, destination IP address, and IP protocol).
• 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 11. 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)#
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Content Addressable Memory (CAM)