Reference Guide

204 | Content Addressable Memory (CAM)
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Important Points to Remember
• All stack-unit within a single system must have the same CAM profile; this profile must match the
system CAM profile.
• FTOS automatically reconfigures the CAM profile on line cards and the secondary RPM to match
the system CAM profile by saving the correct profile on the card and then rebooting it.
• The CAM configuration is applied to entire system when you use CONFIGURATION mode
commands. You must save the running-configuration to affect the change.
• All CAM configuration commands require you to reboot the system.
• When budgeting your CAM allocations for ACLs and QoS configurations, remember that ACL and
QoS rules might consume more than one CAM entry depending on complexity. For example, TCP and
UDP rules with port range options might require more than one CAM entry. Refer to Pre-calculating
Available QoS CAM Space on page 681.
CAM Allocation
User Configurable CAM Allocations is available on platforms: s z
Allocate space for IPV4 ACLs and QoS regions, and IPv6 6 ACLs and QoS regions on the S-Series by
using the
cam-acl command in CONFIGURATION mode.
The CAM space is allotted in FP blocks. The total space allocated must equal 13 FP blocks. Note that there
are 16 FP blocks, but the System Flow requires 3 blocks that cannot be reallocated. The default CAM
Allocation settings on a S-Series system are:
•
L2Acl : 6
• Ipv4Acl : 4
• Ipv6Acl : 0
• Ipv4Qos : 2
• L2Qos : 1
• L2PT : 0
• IpMacAcl : 0
• VmanQos : 0
• EcfmAcl : 0
• FcoeAcl : 0
•
iscsiOptAcl : 0
The ipv6acl and vman-dual-qos allocations must be entered as a multiple of 2 (2, 4, 6, 8, 10). All other
profile allocations can use either even or odd numbered ranges.
You must save the new CAM settings to the startup-config (
write-mem or copy run start) then reload the
system for the new settings to take effect.