Ask the Expert: Nexus 5000, 3000 and 2000 Series

[ciscomoderator]

With Lucien Avramov

Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to learn about design, configuration and troubleshooting of the Cisco Nexus 2000, 3000, 5000 Series with cisco Expert Lucien Avramov. Lucien Avramov is a technical marketing engineer in the Server Access Virtualization Business Unit at Cisco, where he supports the Cisco Nexus 5000, 3000 and 2000 Series. He has several industry certifications including CCIE #19945 in Routing and Switching, CCDP, DCNIS, and VCP #66183

Remember to use the rating system to let Lucien know if you have received an adequate response. 

Lucien might not be able to answer each question due to the volume expected during this event. Remember that you can continue the conversation on the Data Center sub-community   discussion forum shortly after the event.   This event lasts through October 21, 2011. Visit this forum often to view responses to your questions and the questions of other community members.

[tiwang]

hi again lucien - is there a reason why you not "promote" a vPC solution between two set of nexus there? - In all the design-guides I have seen the vPC is used to bundle channels on fexes to hosts - but today many blade-servers are equipped with 10 gig interfaces so it make more sense to me to look for the vPC between pairs of nexus boxes instead - in our case we are using vPC to implement a DCI with 4 10G black-fiber connections (distance 50km) between 4 pair of nexus boxes (2 pairs for "user-data" and 2 pairs for iSCSI) - any comments on this? Are there any pitfalls ?

[Lucien Avramov]

In case of 10 GE servers, you have 2 options: either you go to the Nexus Switch directly or, you can also use the 2232 fabric extender if you like. No really comments on dark-fiber connection. Are you going through a DWDM provider to interconnect?

[tiwang]

hi lucien

Well - now - I am not that familar with the different technologies on the fiber-connection - we get 4 10G fiber-connections from the service-provider and I try not to worry about how they are connected (but as far as I can guess from what they have put into our rack we are going trough a DWDM)

But - I have but these 2 x 2 10G fiber-connections into to sets of nexus 5k's which support iSCSI on the one set of 10G fibers and "data" on the other set. I have tried to isolate each set of nexus in a seperate STP domain as described in the Cisco DCI doc 2.0 (BPDU filter on each of the vPC's) and this also looks ok. Testing failover from one link to the other with a "ping" is almost 100% - but what do I have to be aware of in this setup? Everything looks ok so what I am looking for are there pitfalls or what I have to be aware of ? Tuning - or "not to do"...

best regards /ti

[Lucien Avramov]

For FCOE, the distance between N5ks for synchronous storage is 3 km. If you are running Ethernet only type of traffic (including NFS / iSCSI) then thee is no specific caveats to interconnect your data-centers.

[Saravanan Mani]

Hi.,

    We are using Nexus 7k & 5K in our lab. I have created new VLAN in AGG(N7k VDC) and configured hsrp and created the interface vlan for routing aslo. now the problem is existing VLAN's traffic are going via N5k from UCS without any problem , but the newly created vlan is not hitting. Pin group, VLAN , Uplink is configured in UCS FI(6140xp) correctly. And also added the new vlan to the existing portchannels.

NOTE:If i connect a uplink from FI to N7k all the trraffic is going. But VIA N5k the new Vlan is not  going.

Kindly help me to solve this issue.

Please find the topology below.

 

Thanks & Regards

Saravanan.M

[Lucien Avramov]

This should be working, I'd suggest to troubleshoot this further, using the troubleshooting guide :

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/troubleshooting/guide/n5K_ts_l2.html

[tiwang]

short question which I cannot find a 100% answer on from the websites - are the n7k compatible with the n2k fex - and if so - also the 10 gig ? and if so - any linitations - what about if using the L3 features?

best regards /ti

[smartboy2255]

hi Lucien,

   While I upgrading NX-OS from 4.0(0)N1(2) to 4.0.1a.N1.1a , I am getting  SRG error.

show install all impact kickstart bootflash:n5000-uk9-kickstaart.4.0.1a.N1.1a.bin system bootflash:n5000-uk9.4.0.1a.N1.1a.bin

Verifying image bootflash:/n5000-uk9-kickstart.4.0.1a.N1.1a.bin for boot variabl

e "kickstart".

[#                   ]   0%[####################] 100% -- SUCCESS

Verifying image bootflash:/n5000-uk9.4.0.1a.N1.1a.bin for boot variable "system"

.

[#                   ]   0%[####################] 100% -- SUCCESS

Verifying image package type.

[#                   ]   0%[#####               ]  20%[####################] 100% -- SUCCESS

Extracting "system" version from image bootflash:/n5000-uk9.4.0.1a.N1.1a.bin.

[#                   ]   0%[#                   ]   0% -- FAIL. Return code 0x404F0003 (SRG file not present/cannot be opened).Version Compatibility check failed. Return code 0x40930012 (SRG extraction failed).

Regards,

Ajith

[Lucien Avramov]

I assume you have checked the MD5 check-sum of the file and compared to the file you have downloaded and make sure the file size matches on N5K.

Can you run a reload to clear some of the temp space? And then try again?

If that still does not help, can you please send me the output of show system internal flash?

[smartboy2255]

HI Lucien,

MD5 is correct and same OS we have upraded in a different N5k and it is working fine. It is very difficult to get the downtime for reload..pls find the logs..Also we have tried with different version NX-OS.

Tried versions: 4.0.1a.N2.1

                              4.0.1a.N1.1a

                              4.2.1.N2.1

nexus1# cop [Jy tf [Jtp: bo [Jotflash:

Enter source filename: n5000-uk9-kickstart.4.0.1a.N1.1a.bin

Enter vrf (If no input, default vrf is considered): management

Enter hostname for the tftp server: 3.235.236.5

Trying to connect to tftp server......

Connection to server Established.

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TFTP get operation was successful

nexus1# dir boo [Jtflash:

      49152     Mar 14 15:47:30 2011  lost+found/

   20058112     Mar 14 14:35:58 2011  n5000-uk9-kickstart.4.0.0.N1.2.bin

   20217856     Oct 15 10:09:08 2011  n5000-uk9-kickstart.4.0.1a.N1.1a.bin

   76930262     Mar 14 15:08:30 2011  n5000-uk9.4.0.0.N1.2.bin

   85704356     Oct 15 10:06:02 2011  n5000-uk9.4.0.1a.N1.1a.bin

    3416570     Mar 16 21:00:50 2011  output_k.file

       4096     Jan 01 05:33:41 2005  routing-sw/

Usage for bootflash://sup-local

  266833920 bytes used

  587804672 bytes free

  854638592 bytes total

Show Version

Cisco Nexus Operating System (NX-OS) Software

TAC support: http://www.cisco.com/tac

Copyright (c) 2002-2008, Cisco Systems, Inc. All rights reserved.

The copyrights to certain works contained herein are owned by

other third parties and are used and distributed under license.

Some parts of this software may be covered under the GNU Public

License or the GNU Lesser General Public License. A copy of

each such license is available at

http://www.gnu.org/licenses/gpl.html and

http://www.gnu.org/licenses/lgpl.html

Software

  BIOS:      version 1.2.0

  kickstart: version 4.0(0)N1(2)

  system:    version 4.0(0)N1(2)

  BIOS compile time:       06/19/08

  kickstart image file is: bootflash:/n5000-uk9-kickstart.4.0.0.N1.2.bin

  kickstart compile time:  8/3/2008 2:00:00 [08/03/2008 15:13:03]

  system image file is:    bootflash:/n5000-uk9.4.0.0.N1.2.bin

  system compile time:     8/3/2008 2:00:00 [08/03/2008 15:42:21]

[7m--More-- [m

[K

Hardware

  cisco Nexus5020 Chassis ("40x10GE/Supervisor")

  Intel(R) Celeron(R) M CPU   with 2074164 kB of memory.

  Processor Board ID JAF1246BAFC

  bootflash:  974848 kB

geitc-energynexus1   kernel uptime is 920 days 20 hours 28 minute(s) 5 second(s)

  Last reset

    Reason: Unknown

    System version: 4.0(0)N1(2)

    Service:

[smartboy2255]

Is there any Bios revision number dependency for the upgrade.

[Lucien Avramov]

Can you please send me the output "show system internal flash"

[smartboy2255]

"show system internal flash" will send after some time..

dir bootflash:

         46     Oct 15 12:58:57 2011  ..tmp-kickstart

         36     Oct 15 12:58:57 2011  ..tmp-system

   20058112     Oct 15 12:58:57 2011  .tmp-kickstart

   76930262     Oct 15 12:58:57 2011  .tmp-system

    2618215     Mar 16 21:47:17 2011  energynexus2.log

      49152     Oct 15 12:58:57 2011  lost+found/

   20058112     Dec 03 00:11:49 2008  n5000-uk9-kickstart.4.0.0.N1.2.bin

   20193280     Oct 15 12:45:42 2011  n5000-uk9-kickstart.4.0.1a.N2.1.bin

   76930262     Dec 03 00:13:15 2008  n5000-uk9.4.0.0.N1.2.bin

   78187520     Oct 15 13:09:37 2011  n5000-uk9.4.0.1a.N2.1.bin

       4096     Jan 01 05:33:45 2005  routing-sw/

          0     Jul 30 14:38:44 2009  test1

Usage for bootflash://sup-local

  355590144 bytes used

  499048448 bytes free

  854638592 bytes total

[Lucien Avramov]

The image size doesn't seem right...

Here is what I have:

  103557265    Oct 17 10:29:06 2011  n5000-uk9.4.0.1a.N2.1.bin

[smartboy2255]

HI,

   We have tried multiple times. i think one time that has occured.pls find the below log.

dir bo [Jotflash:

      49152     Oct 15 10:49:13 2011  lost+found/

   20058112     Oct 15 10:49:24 2011  n5000-uk9-kickstart.4.0.0.N1.2.bin

   20193280     Oct 15 11:05:19 2011  n5000-uk9-kickstart.4.0.1a.N2.1.bin

   76930262     Oct 15 10:49:25 2011  n5000-uk9.4.0.0.N1.2.bin

  103557265     Oct 15 11:03:05 2011  n5000-uk9.4.0.1a.N2.1.bin

    3416570     Mar 16 21:00:50 2011  output_k.file

       4096     Jan 01 05:33:41 2005  routing-sw/

Usage for bootflash://sup-local

  284680192 bytes used

  569958400 bytes free

  854638592 bytes total