About Madhukrishnan Gopinathan Nair

Madhukrishnan Gopinathan Nair · ‎02-20-2017

Thanks. This could be the output drops causing the slowness. Since the packets starts retransmits, it can worsen it. Output drops are not caused by Layer 1. This could be due to buffer filling up. Please send me the below output to see which queue is dropping them. We can try tweak them to get rid of it. sh mls qos interface g1/0/14 statistics Regards, Madhu.

Madhukrishnan Gopinathan Nair · ‎02-20-2017

Hello Raul, Could you please share me the below sh ver sh mls qos sh queuing int GigabitEthernet1/0/14 Is the output drops seen increasing on them? Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 7761 Regards, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-20-2016

Thanks D R and happy to hear my comments were helpful to you. Regarding the other post, at the moment I am unsure about too. I will post it back if I find that information. Regards, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-20-2016

Pleas also note all the above were interms of Nexus OTV. I have not worked on OTV with ASRs however I assume the fundamental concepts to be the same. You could cross check it with ASR OTV white papers and best practices for verification. Regards, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-20-2016

Apart from the above, please keep in mind there is no AED - reelection if your internal interface goes down, unlike your join interface going down or OTV VDC going offline. So ensure you have redundancy in place for the internal interfaces too via port-channel or VPC(if two DC cores are used). Hope this helps and kindly remember to rate the posts if you find them useful. Regards, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-20-2016

Also when your circuit recovers, again it will take over the AED role for the vlans it was handling before. Is an OTV on a stick deployment generally recommended over OTV linline simply to reduce failover time? From an OTV perspective there is no difference between the two models. The main advantage of the Appliance on a Stick model is that no changes to the design or to the physical connections would be required once the dependency from the OTV VDC is removed. The only migration steps at that point would be to move the OTV configuration from the OTV VDC to the Routing VDC and deactivate the OTV VDC. This would be transparent to the rest of the data center network. Reference : http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DCI3_OTV_Intro/DCI_1.html http://www.cisco.com/c/dam/en/us/products/collateral/switches/nexus-7000-series-switches/guide_c07-728315.pdf

Madhukrishnan Gopinathan Nair · ‎08-20-2016

HI D R, My understanding is that as soon the Overlay goes down (in this case it will time out eventually) it looses its AED capability. So eventually, I assume the the redundant edge device will become AED for all vlans. I am expecting the below output under OTV when your adjacency goes down. sh otv <SNIP> AED-Capable : No (No Overlay Remote Adjacency up) Hope this helps, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-20-2016

This seems a loop there. This could be due to a mis configuration since its just not one host is flapping but a bunch of them. Check what is connected to Po1 , Te 3/7 and Te4/7. Ensure the port-channel 1 is configured correctly on the remote end too ? Also check the config on remote side for Te3/7 and Te4/7 Regards, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-17-2016

Once you go through the above, if you have any specific doubts/questions, please feel free to ask. Regards, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-17-2016

Hi, Interms of configuring HSRP, there is no difference if you have a VPC running between the switches. Its same as the regular HSRP configuration between 2 individual nexus boxes. A HSRP config example can be found here http://www.cisco.com/c/en/us/support/docs/switches/nexus-7000-series-switches/113002-nexus-hsrp-00.html Also you could read details about how HSRP works in VPC under this link. http://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf Read through "Best Practices for HSRP/VRRP and vPC" on the above link. Hope this helps, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-17-2016

HSRP behaves in many ways similar to IOS setup. However please note that in VPC , both your active and standby HSRP switches will be forwarding the traffic actively. So this an active/active set up rather than conventional active/standby set up. Please let us know if you have any questions on this. Hope this helps, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-13-2016

To add it what Ahmed said, It would be better to disable the BA on 6500 as BA is not recommended for VPC member ports. For access switches connected to vPC domain, use the following guidelines/best practices: Strong Recommendations: ● Enable STP port type “edge” and port type “edge trunk” on host ports © 2015-2016 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 67 of 129 ● Enable STP BPDU-guard globally ● Disable STP channel-misconfig guard if supported by access switches ● Do not enable Loopguard on vPC (disabled by default) ● Do not enable Bridge Assurance on vPC http://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf I think the best solution will be to remove the below from 6500 Port-channel to disable BA on this link. spanning-tree portfast network Also ensure the above removes the same from 5/4 and 5/5 else remove it from there too. Hope this helps, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-13-2016

Could you please share sh int vlan #. Also TX and RX on a SVI interface is logical and if it is showing more than the BW configured, it does not indicate a problem since it is just logical and not bound by the BW seen on it. Regards, Madhu.

Madhukrishnan Gopinathan Nair · ‎08-12-2016

6509 (1) will reload and join back as VSS standby. It won't be able to send and receive traffic during that. It is recommended to have connectivity to both chassis when using VSS(MEC) so that no outage for connected system occurs when this happens. HTH Madhu.

Madhukrishnan Gopinathan Nair · ‎08-02-2016

This could indicate a possible loop somewhere. Enable mac move notification to see if any host is causing any issue. conf t mac address table notification mac move (syntax may be a little diffrent) Other thing could be a memory leak. Monitor the mem utlization. sh proc mem ---> A few times and see if your memory is quickly depleting. If all these does not help try upgrading the switch to the suggested code 12.2.55-SE10(ED) as per CCO. Hope this helps. Regards,

Madhukrishnan Gopinathan Nair · 02-20-2017 09:04 PM

Thanks. This could be the output drops causing the slowness. Since the packets starts retransmits, i...

Madhukrishnan Gopinathan Nair · 02-20-2017 08:45 AM

Hello Raul, Could you please share me the below sh ver sh mls qos sh queuing int GigabitEthernet1/0/...

Madhukrishnan Gopinathan Nair · 08-20-2016 05:57 AM

Thanks D R and happy to hear my comments were helpful to you. Regarding the other post, at the momen...

Madhukrishnan Gopinathan Nair · 08-20-2016 03:10 AM

Pleas also note all the above were interms of Nexus OTV. I have not worked on OTV with ASRs however ...

Madhukrishnan Gopinathan Nair · 08-20-2016 03:07 AM

Apart from the above, please keep in mind there is no AED - reelection if your internal interface go...

Madhukrishnan Gopinathan Nair · 08-20-2016 03:02 AM

Also when your circuit recovers, again it will take over the AED role for the vlans it was handling ...

Madhukrishnan Gopinathan Nair · 08-20-2016 02:51 AM

HI D R, My understanding is that as soon the Overlay goes down (in this case it will time out eventu...

Madhukrishnan Gopinathan Nair · 08-20-2016 02:11 AM

This seems a loop there. This could be due to a mis configuration since its just not one host is fla...

Madhukrishnan Gopinathan Nair · 08-17-2016 12:15 PM

Once you go through the above, if you have any specific doubts/questions, please feel free to ask. R...

Madhukrishnan Gopinathan Nair · 08-17-2016 12:14 PM

Hi, Interms of configuring HSRP, there is no difference if you have a VPC running between the switch...

Madhukrishnan Gopinathan Nair · 08-17-2016 11:51 AM

HSRP behaves in many ways similar to IOS setup. However please note that in VPC , both your active a...

Madhukrishnan Gopinathan Nair · 08-13-2016 01:36 AM

To add it what Ahmed said, It would be better to disable the BA on 6500 as BA is not recommended for...

Madhukrishnan Gopinathan Nair · 08-13-2016 01:09 AM

Could you please share sh int vlan #. Also TX and RX on a SVI interface is logical and if it is show...

Madhukrishnan Gopinathan Nair · 08-12-2016 10:23 PM

6509 (1) will reload and join back as VSS standby. It won't be able to send and receive traffic duri...

Madhukrishnan Gopinathan Nair · 08-02-2016 10:33 AM

This could indicate a possible loop somewhere. Enable mac move notification to see if any host is ca...

Date Registered	‎12-02-2013 11:08 PM
Date Last Visited	‎11-02-2017 12:41 AM
Total Messages Posted	619
Total Helpful Votes Received	331