OmniSwitch OS6860/OS6900/OS10K Troubleshooting Guide Part No.032996-00 Rev.A
AOS Release 7.X and 8.X January 2015
Alcatel-Lucent Page 71 of 148
precedence in the rule. If precedence is not specified, rule entered first will have higher precedence.
Configuration
policy condition c1 source vlan 559 source ipv6 2001:4cd0:bc00:2570:1::1 destination tcp-port 80
policy condition c2 source vlan 519 destination ipv6 2001:4cd0:bc00:2570:1::1 source tcp-port 80
policy condition c3 source vlan 559 source ipv6 2001:4cd0:bc00:2570:1::2 destination tcp-port 80
policy action a1
policy rule r1 condition c1 action a1
policy rule r2 condition c2 action a1
policy rule r3 condition c3 action a1
ERROR: Out of TCAM processors on 1/0(0)
TCAM Utilization
Rule 3 cannot be configured on the system because rules 1 and 2 are already using every 4 slices available (2
slice pairs), so rule 3 cannot use the same slice pair as rule 2. The switch returns an error stating that the
system is out of TCAM processors.
Example 2: TCAM exhausted because of a manually misconfigured precedence order
The following mix of source IPv6 rules and destination IPv6 rules will cause the TCAM to allocate 1 entry per
slice pair because of the precedence order. The 3rd rule cannot be programmed into the hardware because no
slice is available.
Configuration
policy condition c1 source vlan 559 source ipv6 2001:4cd0:bc00:2570:1::1 destination tcp-port 80
policy condition c2 source vlan 519 destination ipv6 2001:4cd0:bc00:2570:1::1 source tcp-port 80
policy condition c3 source vlan 559 source ipv6 2001:4cd0:bc00:2570:1::2 destination tcp-port 80
policy action a1
policy rule r1 condition c1 action a1 precedence 100
policy rule r2 condition c2 action a1 precedence 110
policy rule r3 condition c3 action a1 precedence 120
ERROR: Out of TCAM processors on 1/0(0)
TCAM Utilization
Rule 3 cannot be configured on the system because rules 1 and 2 are already using all 4 slices available (2 slice
pairs), so rule 3 cannot use the same slice pair as rule 2. The switch returns an error stating that the system is
out of TCAM processors.
Example 3: Similar to example 1 and 2 with an optimized and working configuration – Efficient usage of the
Precedence
Configuration
policy condition c1 source vlan 559 source ipv6 2001:4cd0:bc00:2570:1::1 destination tcp-port 80
policy condition c2 source vlan 519 destination ipv6 2001:4cd0:bc00:2570:1::1 source tcp-port 80
policy condition c3 source vlan 559 source ipv6 2001:4cd0:bc00:2570:1::2 destination tcp-port 80
policy action a1
policy rule r1 condition c1 action a1 precedence 110
policy rule r2 condition c2 action a1 precedence 100
policy rule r3 condition c3 action a1 precedence 120
qos apply
TCAM Utilization
This configuration will use slice pair 6_7 for the source IPv6 rules and slice pair 4_5 for the destination IPv6
rule.
This configuration will accomplish the same purpose as example 1 and example 2 while consuming only 4
slices while the 2 previous examples were consuming too many slices and were not supported on the system.
-> show qos slice
Slot/ Ranges Rules Counters Meters
Unit Type Total/Free CAM Total/Free Total/Free Total/Free
1/1/(0) IFP 32/32 0 128/128 128/128 128/128
1 128/127 128/127 128/128
2 128/125 128/125 128/128
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