Cam Optimization; Applications For Cam Profiling; Lag Hashinglag Hashing Based On Bidirectional Flow; Unified Forwarding Table (Uft) Modes - Dell C9000 Series Networking Configuration Manual

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CAM Optimization

The cam-optimization command allows you to optimize CAM utilization for QoS entries by minimizing the

amount of required policy-map CAM space.

When you enable this command, if a Policy Map containing classification rules (ACL and/or dscp/ ip-

precedence rules) is applied to more than one physical interface on the same port-pipe, only a single copy of

the policy is written (only 1 FP entry is used). When you disable this command, the system behaves as

described in this chapter.

The following describes link aggregation group (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

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-

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

Content Addressable Memory (CAM)