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%EX2YD:12 %DIFFSERV-2-
DSA_QOS_CAM_INSTALL_FAILED: Not enough space in L3 Cam(PolicyQos) for class 5 (Te 1/
22) entries on portpipe 1 for linecard 1
If you exceed the QoS CAM space, follow these steps.
1 Verify that you have congured a CAM prole that allocates 24 K entries to the IPv4 system ow region.
2 Allocate more entries in the IPv4Flow region to QoS.
Dell EMC Networking OS supports the ability to view the actual CAM usage before applying a service-policy. The test cam-usage
service-policy command provides this test framework. For more information, refer to Pre-Calculating Available QoS CAM Space.
Implementing ACLs on Dell Networking OS
You can assign one IP ACL per interface with Dell Networking OS. If you do not assign an IP ACL to an interface, the software does not use
it in any other capacity.
The number of entries allowed per ACL is hardware-dependent.
If you enable counters on IP ACL rules that are already congured, those counters are reset when a new rule is inserted or prepended. If a
rule is appended, the existing counters are not aected. This is applicable to the following features:
• L2 Ingress Access list
• L2 Egress Access list
• L3 Ingress Access list
• L3 Egress Access list
NOTE
: IP ACLs are supported over VLANs in Dell Networking OS version 6.2.1.1 and higher.
ACLs and VLANs
There are some dierences when assigning ACLs to a VLAN rather than a physical port.
For example, when using a single port-pipe, if you apply an ACL to a VLAN, one copy of the ACL entries is installed in the ACL CAM on the
port-pipe. The entry looks for the incoming VLAN in the packet. Whereas if you apply an ACL on individual ports of a VLAN, separate
copies of the ACL entries are installed for each port belonging to a port-pipe.
ACL Optimization
If an access list contains duplicate entries, the Dell Networking OS deletes one entry to conserve CAM space.
Standard and extended ACLs take up the same amount of CAM space. A single ACL rule uses two CAM entries whether it is identied as a
standard or extended ACL.
Determine the Order in which ACLs are Used to Classify Trac
When you link class-maps to queues using the service-queue command, the Dell Networking OS matches the class-maps according to
queue priority (queue numbers closer to 0 have lower priorities).
As shown in the following example, class-map cmap2 is matched against ingress packets before cmap1.
ACLs acl1 and acl2 have overlapping rules because the address range 20.1.1.0/24 is within 20.0.0.0/8. Therefore (without the keyword
order), packets within the range 20.1.1.0/24 match positive against cmap1 and are buered in queue 7, though you intended for these
packets to match positive against cmap2 and be buered in queue 4.
Access Control Lists (ACLs)
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