ā02-25-2011 01:10 PM - edited ā03-01-2019 06:54 AM
with Lucien Avramov
Welcome to the Cisco Networking Professionals Ask the Expert conversation. This is an opportunity to learn how to troubleshoot Nexus 5000 & 2000 series with Lucien Avramov. Lucien is a customer support engineer at the Cisco Technical Assistance Center. He currently works in the data center switching team supporting customers on the Cisco Nexus 5000 and 2000. He was previously a technical leader within the network management team. Lucien holds a bachelor's degree in general engineering and a master's degree in computer science from Ecole des Mines d'Ales. He also holds the following certifications: CCIE #19945 in Routing and Switching, CCDP, DCNIS, and VCP #66183.
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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 Security discussion forums shortly after the event. This event lasts through March 11, 2011. Visit this forum often to view responses to your questions and the questions of other community members.
ā03-08-2011 08:21 AM
Hi Lucien,
I have 2 Nexus 5020 running NX-OS 5.0(2)N1(1) and 1 N2248..
The VPC architecture is: FEX Dual-Connected to N5K switches
VPC Peer link between both N5K is UP.
N5K ports connected to the N2K are in ā"fex-fabric DOWNā reason= SDP timeout/SFP Mismatch
Iāve tried to configure the same ports in āaccess modeā and the port comes UP.
As soon as I configure them in āfex-fabric modeā, the ports go down.
Here is my N5K configuration:
int port-channel 102
description FEX-102
switchport mode fex-fabric
fex associate 102
vpc 102
int e1/20
description FEX-102
switchport mode fex-fabric
fex associate 102
channel-group 102
Can you help ?
Thanks ;-)
XaviĆØre
ā03-08-2011 10:43 AM
Thanks for your question. I assume you have only e1/20 connected on each N5K to this fex.
Can you make sure of the following, and feel free to attach the outputs back:
-show interface e1/20 transceiver details
I suspect you are not using matching SFPs on each N5K. You can use any supported SFP from the matrix, however we need them to match on each N5K when going to the same FEX.
ā03-09-2011 06:01 AM
Thx a lot !
SFP didn't match :-) It works now !
XaviĆØre
ā03-08-2011 01:21 PM
Hello,
I am trying to extend the fabric from a 5020 to a 2248TP and 2232PP.
I have the fet-10g but my 5020 doesn't like it. Link light is orange on the 5020 port and off on the 2000 switches.
Eth1/17 -- sfpInvali 1 full 10G 10g
Eth1/18 -- sfpInvali 1 full 10G 10g
Ethernet1/17
transceiver is present
type is Fabric Extender Transceiver
name is CISCO-FINISAR
part number is FTLX8570D3BCL-C1
revision is A
serial number is ......
nominal bitrate is 10300 MBit/sec
Link length supported for 50/125um fiber is 20 m
Link length supported for 50/125um fiber is 100 m
Link length supported for 62.5/125um fiber is 10 m
cisco id is --
cisco extended id number is 4
Transceiver Detail Diagnostics Information (internal calibration)
----------------------------------------------------------------------------
Current Alarms Warnings
Measurement High Low High Low
----------------------------------------------------------------------------
Temperature 35.61 C 75.00 C 5.00 C 70.00 C 10.00 C
Voltage 3.27 V 3.63 V 2.97 V 3.46 V 3.13 V
Current 0.40 mA -- 11.80 mA 4.00 mA 10.80 mA 5.00 mA
Tx Power -14.81 dBm -- 2.69 dBm -11.30 dBm -1.30 dBm -7.30 dBm
Rx Power N/A -- 2.99 dBm -13.97 dBm -1.00 dBm -9.91 dBm
----------------------------------------------------------------------------
Note: ++ high-alarm; + high-warning; -- low-alarm; - low-warning
FET-10G is documented to be support on the Nexus 5020 with the 2000 switches. I tried with NX-OS of 4.2 and latest 5.0.3 neither work.
Any ideas what is wrong?
Thanks
A.
ā03-08-2011 05:17 PM
Have you configured the port as switchport mode fex-fabric? The FET-10G only works for this mode.
ā03-09-2011 10:55 AM
Thanks,
switchport mode fex-fabric
did the trick.
ā03-09-2011 12:30 AM
Hi Lucien! Do you have any information if the SFP-10G-ER transceiver will be supported on Nexus 5548/5596 later (and if yes, when)? It seems not to be compatible at the moment according to http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6974.html.
Markku
ā03-09-2011 07:40 AM
You are correct SFP-10G-ER is not supported at this time on the 5500. It is being evaluated for support in future code releases, no more details to share as far as when at this time.
ā03-09-2011 10:17 AM
Hello Lucien,
I just want to know if ERSPAN is supported on the Nexus N5K-C5020P-BF which is running 5.0(2)N1(1). It seems the commands are there to set up ERSPAN source however the parameters like destination IP and source interfaces are not saved in and the ERSPAN indicates as being down.
Here is sample output:
D45-N5K1-25# sh monitor session 1
session 1
---------------
type : erspan-source
state : down (No src/dst configured)
ERSPAN ID : 100
ERSPAN TTL : 3
ERSPAN IP Prec. : 0
ERSPAN DSCP : 0
ERSPAN MTU : 1500
source intf :
rx :
tx :
both :
rx :
destination IP :
D45-N5K1-25#
ā03-09-2011 10:44 AM
Thanks for asking. The issue is reported in CSCtn84269, you can view this in our bug tool kit page:
http://tools.cisco.com/Support/BugToolKit/action.do?hdnAction=searchBugs
Basically, in 5.0.2 code this shows in the parser, however the feature is still not supported. In 5.0.3 and later code, this has been removed from the parser and is not an option.
Rest assured, the feature ERSPAN is in the works but is just not yet released.
ā03-09-2011 01:33 PM
Hi Lucien,
is it possible to have FEX 2148 connected to two Nexus 5k for redundancy? If I look at FEX like a linecard I think it's not possible but
can you confirm this please?
Tnx
ā03-09-2011 01:47 PM
You can surely have a FEX (2148) or any other model dual homed to two Nexus 5ks.
To achieve such you need to configure vPC (virtual port-channel).
Here is a quick start guide:
And a step by step video:
ā03-09-2011 07:56 PM
Hi lucien,
i had received my two first Nexus 5000 but one of them arrived without an NX-OS image and in Loader> prompt.
I tried to load by TFTP the kickstart image but the system gave me the following error message:
loader> boot tftp://172.16.1.3/n5000-uk9-kickstart.4.2.1.N2.1a.bin
Address: 172.16.1.2
Netmask: 255.255.255.0
Server: 172.16.1.3
Gateway: 172.16.1.1
Booting: /n5000-uk9-kickstart.4.2.1.N2.1a.bin console=ttyS0,9600n8nn quiet load
er_ver="pr-1.3"....ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
ALERT: got a fragmented packet - reconfigure your server
TFTP error 0 (Unknown request code.)
Error 15: File not found
I tried this process with 2 different TFTP software 3cDaemon and Solarwinds but the problem persists.
Do you have any advice on these.
Thanks,
Pepe
ā03-09-2011 08:23 PM
Do you mind trying with tftpd32:
ā03-10-2011 06:32 AM
Hi Lucien, it works! but we have to enable the parameter PXE Compatibility in the Advanced TFTP Options to work.
Thank you very much.
Pepe
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