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- About Arumugam Muthaiah
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Member since
05-10-2011
282
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695
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63
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Created by
Arumugam Muthaiah
in Data Center Documents
in Data Center Documents
07-02-2018
10:56 PM
07-02-2018
10:56 PM
thanks for sharing the useful information !!!
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07-24-2015
04:55 AM
Hi, Nexus 7000 supports dual homed FEX but not enhanced vPC even on NX-OS 7.X , I am not seeing any road map to include this feature presently. Regards, Aru
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Created by
Arumugam Muthaiah
in Service Providers Documents
in Service Providers Documents
07-03-2015
11:25 AM
07-03-2015
11:25 AM
Hi Nagendra, Thanks for sharing your valuable experience and you are always a great inspiration :) Regards, Aru
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10-31-2014
02:48 AM
Hi Shanfrancis, Apologies for the late response. I can see the highest cpu utilization is IP Input Process, it means too many packets punt to cpu. You can capture the below commands if you see high CPU again and share the detail #show log #show proc cpu sort | ex 0.00% #show platform health #show plat cpu packet statistics #show interface | include line|\drops (3 times in gap of few min) #debug platform packet all receive buffer – This command doesn’t impact the performance and will helpful to know the packet which pun to CPU #show platform cpu packet buffered Regards, Aru
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07-31-2014
12:06 AM
Hi, Hardware Requirement: VSS is network system virtualization technology that pools Two symmetric Cisco Catalyst 4500E chassis or two Catalyst 4500X-16 Series Switches or two Catalyst 4500X-32 Series Switches into one virtual switch Software Requirement: Cisco Release IOS XE 3.4.0SG and later releases support VSS Refer: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/15-1-2/XE_340/configuration/guide/config/vss.html#wp1053927 Regards, Aru *** Please rate if the post useful ***
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07-06-2014
04:24 PM
Hi Shanfrancis, The "K2L2 Address Table R" process is related to L2 entries and adjacency updates. The learning of MAC addresses on this box is done in software, so if we keep on learning too many mac addresses you will see a spike of CPU on this process. This may happen in the following conditions: Constant receipt of spanning tree topology change BPDUs: on PVST that reduces cam aging and you will see entries being deleted too fast, on rapid-PVST/MST this flushes the entries. Overall a number of entries may need to be deleted/added again. Make sure you have "switchport host" configured on ports which directly connect to end devices. This will avoid TCN generation when a workstation reboots. Mac-address moves: where a user will move from one port to another or a mac address may be looping in the network. I verified the capture and note seeing more MAC utilization as well HW: WS-C4507R SW: cat4500-ipbasek9-mz.122-54.SG1.bin ------------------ show mac-address-table count ------------------ MAC Entries for all vlans: Dynamic Unicast Address Count: 458 Static Unicast Address (User-defined) Count: 0 Static Unicast Address (System-defined) Count: 21 Total Unicast MAC Addresses In Use: 479 Total Unicast MAC Addresses Available: 32768 Multicast MAC Address Count: 98 Total Multicast MAC Addresses Available: 32768 Next Action: I would suggest you to enable the MAC address move notification on the switch which helps to identify us do we see any MAC flap Switch(config)#mac address-table notification mac-move Switch#show mac address-table notification mac-move MAC Move Notification: enabled Switch#show log Switch#show spanning detail | in ieee|occur|from Switch#show platform health | inc K2L2 Address Switch#show platform cpu packet statistics all Switch#show process cpu history If none of the above helping to narrow down the issue, we need to run the below debug to investigate further Switch#debug platform packet all receive buffer Switch#show platform cpu packet buffered Regards, Aru
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07-03-2014
12:12 PM
Hi, Cisco 3560 switch and 4000 series switches has different hardware architecture, we cant expect the same behavior on both switches CPU utilization can become high due to two reasons 1. Processes taking up resources 2. Forwarded Network traffic Please share the below capture to investigate the CPU utilization Clear the interface counter #show version #show log #show interface | include line|\drops (3 times in gap of few min) #show processes cpu sorted | ex 0.00% #show processes cpu history CPU has 16 queues on 3560 switch and each queue can send only certain kind of traffic #show platform port-asic stats drop #show controllers cpu-interface Refer: Troubleshooting High CPU Utilization http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/troubleshooting/cpu_util.html Regards, Aru
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07-03-2014
11:44 AM
Hi, The first switches (made by Kalpana, who was later bought by Cisco). Kalpana was the first, and they did it with custom proprietary hardware. The store-and-forward was much higher latency through the switch. Then Cisco came out with "Fragment Free" switching - meaning that the switch would accept the first 64 bytes, evaluate it, then forward it. By getting at least 64 bytes, the switch could guarantee the the frame was not a runt (runt is a frame < 64bytes, the minimum permissable Ethernet frame size), and could make sure that the addresses were not corrupt. I remember that the catalyst 1924 is set for fragment-free switching which was very old switch. But presently the switches are operating with Store-and-forward and cut-through switching Refer https://supportforums.cisco.com/discussion/9796971/fragment-free-switch Regards, Aru *** Please rate if the post is useful ***
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07-03-2014
02:32 AM
I would like to add below as well, Starting in 5.1(3)n1(1), we have the ability to change the default behavior to store and forward with the following global command: hardware ethernet store-and-fwd-switching Refer: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5548p-switch/qa_c67-618605.html Regards, Aru
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07-03-2014
02:21 AM
Hi, The switch 2960 always uses the store-and-forward method: complete packets are stored and checked for errors before transmission. There is no need to configure the switching method. Most of the access switches will support "store-and-forward" Example: Store-and-forward Catalyst 2960 and 2960-S Catalyst 3750-X and 3560-X Cut-through The Cisco Nexus 5000 Series access-layer switch is an example of a low-latency cut-through single-stage fabric implementation Regards, Aru *** Please rate if the post is useful ***
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02-03-2014
08:44 AM
Hi Dieter, You could see this detail using Cisco Feature Navigator tool which is avilable on the cisco web site. 1. Go to below site http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp 2. Select the Feature button and type the Feature which you would like verify. If you press continue button, you can supported code as well as platform If you would like to know about any specific product support detail, please inform me, i can share information whether it supports or not. Inform me if you need more detail. Regards, Aru
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Created by
Arumugam Muthaiah
in Switching
in Switching
02-03-2014
07:31 AM
02-03-2014
07:31 AM
Hi, Please see the detail below, 6500 switch: The Cisco Catalyst 6904 4-Port 40 Gigabit Ethernet Fiber Module Part number WS-X6904-40G-2T The Cisco Catalyst 6900 Series 4-Port 40 Gigabit Ethernet Fiber Module is compatible only with Cisco Catalyst 6500 Supervisor Engine 2T 32 x 40 Gigabit Ethernet ports or 128 (+2 Supervisor Uplink) 10 Gigabit Ethernet ports (6509-E chassis) 44 x 40 Gigabit Ethernet ports or 176 (+2 Supervisor Uplink) 10 Gigabit Ethernet ports (6513-E chassis) http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/data_sheet_c78-696623.html Nexus 7700 Cisco Nexus 7700 F3-Series 24-Port 40 Gigabit Ethernet Module Data Sheet Part number: N77-F324FQ-25 http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9402/data_sheet_c78-728410.html Cisco Nexus 7700 F2-Series Enhanced 48-Port Fiber 1 and 10 Gigabit Ethernet Module Data Sheet Part number: N77-F248XP-23E http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9402/data_sheet_c78-728409.html Please feel free to call me if you need more clarification. Regards, Aru
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01-27-2014
05:13 AM
Hi Wajid, Thanks for your kind response. I could see that the we are not seeing drops on CPU queue. UG-GW-CORE#sh proc cpu | e 0.00 CPU utilization for five seconds: 34%/1%; one minute: 36%; five minutes: 36% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 156 24497604 2908539 8422 15.57% 14.80% 14.65% 0 Hulc LED Process <=========== 217 8967911 1674951 5354 6.04% 5.16% 5.23% 0 Spanning Tree The "Hulc LED" process does following tasks: Check Link status on every port If the switch supports POE, it checks to see if there is a Power Device (PD) detected Check the status of the transceiver Update Fan status Set Main LED and ports LEDs Update both Power Supplies and RPS Check on system temperature status One can expect that the overall CPU utilization will be between 25 – 35%. Please verify the below commands to verify which process is utilizing the CPU #show processes cpu sort | ex 0.00% #show processes cpu history If the CPU utilization high due to Hulc LED Process, then this expected behavior and Please note that all of the packet forwarding is done in hardware and not by the CPU. So this doesnt cause any impact of any services Please feel free to call me if you need more clarification. Regards, Aru *** Please rate if the post is useful ***
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01-27-2014
01:59 AM
Hi Wajid, Based on your input i could see that there is Hulc LED Process process which is utilizing more CPU than the other. The below Bug matching this behavior presently, CSCsi78581 - Hulc LED Process uses 10-15% CPU on Catalyst 3750/3560 This issue has been observed in 3560X/3750X with PoE, running 12.2(53)SE1 release This is normal behavior. One can expect that the overall CPU utilization will be between 25 – 35%. Plugging PoE devices into all ports on a 3750-X switch will cause the CPU utilization to increase however it will remain in the normal 25 – 35% range. This doesnt cause any impact If you see any issue still, please capture the below commands and share for the further analysis, #show processes cpu sort | ex 0.00% #show processes cpu history #show platform port-asic stats drop #show controllers cpu-interfaces #show log #show version Feel free to call me if you need more clarification. Regards, Aru *** Please rate if the post is useful ***
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07-24-2015
Hi,Nexus 7000 supports dual homed FEX but not enhanced vPC even on NX-OS
7.X , I am not seeing any r...
07-03-2015
Hi Nagendra,Thanks for sharing your valuable experience and you are
always a great inspiration :)Reg...
10-31-2014
Hi Shanfrancis,Apologies for the late response. I can see the highest
cpu utilization is IP Input Pr...
07-31-2014
Hi,Hardware Requirement:VSS is network system virtualization technology
that pools Two symmetric Cis...
07-06-2014
Hi Shanfrancis,The "K2L2 Address Table R" process is related to L2
entries and adjacency updates. Th...
07-03-2014
Hi,Cisco 3560 switch and 4000 series switches has different hardware
architecture, we cant expect th...
07-03-2014
Hi,The first switches (made by Kalpana, who was later bought by Cisco).
Kalpana was the first, and t...
07-03-2014
I would like to add below as well,Starting in 5.1(3)n1(1), we have the
ability to change the default...
07-03-2014
Hi,The switch 2960 always uses the store-and-forward method: complete
packets are stored and checked...
02-03-2014
Hi Dieter,You could see this detail using Cisco Feature Navigator tool
which is avilable on the cisc...
Created by
Arumugam Muthaiah
in Switching
02-03-2014
02-03-2014
Hi,Please see the detail below,6500 switch:The Cisco Catalyst 6904
4-Port 40 Gigabit Ethernet Fiber ...
01-27-2014
Hi Wajid,Thanks for your kind response. I could see that the we are not
seeing drops on CPU queue.UG...
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| Date Registered | 05-10-2011 12:10 AM |
| Date Last Visited | 06-21-2019 01:02 AM |
| Total Messages Posted | 282 |
| Total Helpful Votes Received | 695 |
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