08-24-2018 05:13 AM - edited 03-08-2019 03:58 PM
hello all
We have two 6824-X-LE-40G configured on VSS for MPLS.
there is a known bug for SLCP process that causes CPU issues where TAC its not giving fast feedback.
is there anyone that deployed these devices in VSS for MPLS, etc with any specific used software that its ruining OK?
now i use Version 15.5(1)SY1 but with older versions i cant bring up VSS over 40g ports (other Bugs :D)
thx
08-24-2018 05:18 AM
@mirikucaj1 wrote:
there is a known bug for SLCP process that causes CPU issues where TAC its not giving fast feedback.
I've got a TAC case for an SLCP spike. Older IOS works fine. Same config, newer IOS and the CPU spike to about 85% to 95%. Developers don't want to fix it because, they say, "it's not critical". Uh, what? CPU spikes to 85%-90% is not critical?
08-24-2018 05:43 AM
08-24-2018 06:30 AM
08-24-2018 07:08 AM - edited 08-24-2018 07:23 AM
It's certainly possible to overload a control plan with valid "important" processes. BTW, "important" processes, like routing protocols, STP, etc., should have higher priority. If they are normally (i.e. without bugs) consuming much CPU, though, your network design might need review. (For example, there's a reason OSPF supports areas of different types, or why there's "dampening" features, or why there are different "flavors" of STP, such as MST, which avoids PVSTP issues with lots of VLANs, or STP edge port configuration options [portfast], etc., etc.)
As to ping, responding to ping is usually considered a low priority task. I.e. it's not unusual to see high max values when you ping a "busy" Cisco network device. Ping is a very basic "it's alive" protocol, its latency measurements shouldn't be expected to be highly accurate. (NB: if you're looking for accurate network latency, you need an application designed for that. For example, Cisco's IP SLA responder works to improve latency measurement over ordinary ping. [NB: a super accurate latency application would place at risk other network device control plane functions.])
08-24-2018 08:05 AM
08-24-2018 09:12 AM
08-24-2018 05:01 PM
08-26-2018 11:52 PM
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