Questions tagged [cpu]

For questions about CPU in relation to networking and network devices. For instance, you are troubleshooting high CPU load on your Nexus switch.

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High CPU utilization on Juniper ACX2100 chassis fpc

What is the cause of high utilization of cpu on fpc.Below is the output of which depicts utilization as 99 but router is running just fine. show chassis fpc Temp CPU ...
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1answer
46 views

Does HUB has calculation function?

We know the HUB broadcast the frames. I have a question, does it have a CPU for calculate something? the Switch have MAC address table, then we can know it have calculate function for record MAC ...
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1answer
59 views

How much CPU power does it take to process a packet? [closed]

Had a debate with a friend on CPU requirements for networking. I'm not a network engineer, but my understanding is that minimal CPU processing happens for IPv4 network traffic and that it's mostly ...
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0answers
26 views

Are different clock rates affecting the transfer-rate? [closed]

I have to kinds of IoT-devices, which should communicate over TCP and sharing files with each others. IoT-device of type 1 has 240 MHz. IoT-device of type 2 has 160 MHz. Now I have observed the ...
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1answer
480 views

Cisco Nexus 3064PQ CPU spike causing packetloss

Nexus 3064 CPU spike and packetloss I have L3 Cisco 3064PQ switch which is running latest "nxos.7.0.3.I4.7.bin" basically I am using for routing so my ISP 2x10Gbps link terminated (with LACP) on ...
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2answers
352 views

Nexus 3064 strange CPU utilization

My SNMP monitoring showing Nexus 3064 switch CPU utilization 20% But on switch cpu history showing 72 Hour maximum CPU%, is this normal? # show proc cpu history 1 1 11 1 1 11 111 11 ...
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0answers
333 views

Cisco ASR1006 ESP40 high CPU utilization

We have ASR1006 with ASR1000-ESP40 and it seems strange on our SNMP monitoring its showing Max CPU utilization 70% and avg 35% but when i check on command line numbers are totally different, what is ...
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1answer
3k views

What kind of CPU do managed switches have?

Do managed switches have regular x86 CPUs? Do they have proprietary CPUs? Or other types of processors like PowerPC processors or others? Is it possible to find out what type or model of CPU is ...
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1answer
153 views

HP ProCurve CPU at 100% for 20 minutes after reboot [duplicate]

I have a little concern regarding HP Procurve switches. I am monitoring an important number of HP switches, and I observed that after the reboot, few seconds later CPU usage raised up to 100% and ...
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1answer
693 views

Cisco CPU utilization threshold violation traps

I enabled SNMP and Traps on a cisco router and I used snmp-server enable traps cpu threshold command in configuration mode. I configured LinkUp-Down Traps with snmp-server enable traps snmp linkup ...
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2answers
556 views

Searching in TCAM vs RAM

I understand the higher level of TCAM and how it differs from CAM and also RAM. My question is from the architectural point of view. I've read that TCAM search is really faster than RAM due to the ...
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2answers
575 views

On a Layer 3 switch, what part does the CPU play in forwarding packets?

I am a Systems Administrator at a small firm. We are latency sensitive. When forwarding packets, what protocols use the CPU and which use the ASICs? We have mostly Arista 7124's (for the most latency ...
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1answer
828 views

Cisco Aironet 1142 - CPU stuck at 100% utilization

I have a Cisco Aironet 1142 (AIR-LAP1142N-A-K9) running autonomous firmware (c1140-k9w7-mx.153-3.JBB1) which started frequently rebooting it self today due to watchdog timeouts. I've checked sh proc ...
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1answer
37 views

Why can the hypervisor not see RAM utilization? [closed]

On AWS, I noticed that their CloudWatch tool cannot see memory utilization of EC2 instances. I can, on the other hand, see CPU utilization, network metrics, etc. Why is it that a hypervisor can see ...
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1answer
2k views

6807XL CPU process stuck at 25 / 30 %

I've recently installed a new 6807XL Chassis in VSS in my datacenter. After 3 weeks, I keep seeing the CPU usage around 25% (per second, per minute or per five minutes). Looking at the historical ...
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2answers
5k views

TCAM relationships in hardware-switching architecture

I am familiar (high level) with how Ternary Content Addressable Memory operates but I remain confused as to how TCAM relates to ASICs and when these components possibly also combine with the CPU for ...