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High CPU usage Cisco 4506-E SUP8-E

M-Gran
Level 1
Level 1

Hi, 

We are facing an issue here where we updated our 4500s to 3.10.0 to enable native IPv6. With the update we faced an issue where the CPU is spiking and we've located that it's these processes:

 

KxAclPathMan update 2.00 36.14 10 52 100 500 18 20 17 4730:42
KxAclPathMan reprogr 1.00 39.72 2 14 100 500 57 57 48 13090:13

It's similar to this bug:

 

4506 Sup6L-E running 15.2(2)E6 High CPU due to KxAclPathMan reprogr, KxAclPathMan update

CSCvf02423

 

Symptom:
High CPU was seen on a 4500 with Sup6L-E running 15.2(2)E6. The process that is high was Cat4k Mgmt LoPri.

In the output of "show platform health" KxAclPathMan update and KxAclPathMan reprogr were also high.

In a CPU capture, ARP traffic was seen in the capture, as well as the following output: "Event: Input Acl Fwd"

Conditions:
4500 with Sup6L-E running 15.2(2)E6 as well as ARP inspection and Private VLANs configured.

Workaround:
A downgrade to 15.2(2)E5 resolved the high CPU seen on the 4500.

 

 

So my question is, is there anyway to resolve this without downgrading as a whole lot of customers will be affected. As well we need the IPv6-support. Does anyone know if a fix is in the makings with a new release and when a new update might be released (3.10.x) ?

 

Regards.

4 Replies 4

LordOfThePings
Level 1
Level 1

I was told by a TAC engineer that the issue would be resolved in 15.2(2)E8  but that wouldn't be released until 2018.  Very vague I know.  I escalated to our account team for an exact ETA of the release.  I have to use 15.2(2)E6 for device profiling to work correctly with ISE so I am in the same boat you are.  :/

did you get any other solution instead of downgrade? I got same issues.

No we didn't, We just downgraded in wait for the patch.

Anyone got some luck with 3.10.1? The CPU went up even higher for us, would be nice to know if anyone else had some luck with the latest version!

 

 

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