07-11-2012 09:15 AM - edited 03-07-2019 07:43 AM
Does anyone know of a method to renumber a FEX without causing service disruption?
Currently I have the following FEX configuration:-
5548# sh fex
FEX FEX FEX FEX
Number Description State Model
------------------------------------------------------------------------
101 fex01 Online N2K-C2248TP-1GE
103 fex03 Online N2K-C2248TP-1GE
105 fex05 Online N2K-C2248TP-1GE
107 fex07 Online N2K-C2248TP-1GE
109 fex09 Online N2K-C2248TP-1GE
111 fex11 Online N2K-C2248TP-1GE
and ideally I want this to change to a sequential numbering scheme:-
5548# sh fex
FEX FEX FEX FEX
Number Description State Model
------------------------------------------------------------------------
101 fex01 Online N2K-C2248TP-1GE
102 fex02 Online N2K-C2248TP-1GE
103 fex03 Online N2K-C2248TP-1GE
104 fex04 Online N2K-C2248TP-1GE
105 fex05 Online N2K-C2248TP-1GE
116 fex06 Online N2K-C2248TP-1GE
Easy enough to:-
1) Preprovisioning the new FEX number
2) Mirror the config
3) Change the FEX association on the FEX downlink ports on the 5548
but I'm certain this will cause a disruption to the connected hosts ports which are in production on the FEX?
Thanks.
07-11-2012 06:06 PM
I think, you are correct. As soon as you issue no fex 102 for example, it will break the portchannel and that will cause an outage.
I am not sure if this is possible, but how about this:
If you have 2 ports from each 2248 connected to the 5ks presently, take the other 2 ports and build for example portchannel 102 and than delete po 103. build po 103 delete po 105 build po 104 delete 107 and so on.
Then again, it may be easier to have a short outage window and re-number them.
HTH
07-17-2012 03:15 PM
In the end, we had to take the hit on downtime to the FEX to renumber, however preprovisioning the new FEX config minimised the outage.
Thanks for your help and consideration.
03-09-2018 03:35 AM
Hello Graham,
Renumbering FEX
No , It's not possible to renumber a FEX without causing service disruption ; you require a downtime for it.
03-29-2018 11:26 PM
Please find below document URL:-
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/confi
guration_guide_c07-543563.html
04-23-2018 10:35 PM
Sometimes it can take a few minutes for the FEX to transit from offline to online.
N5K----FEX
The Fex comes back online within a minute after renumbering:
===before renumbering========
33.03-5548UP# show fex
FEX FEX FEX FEX
Number Description State Model Serial
------------------------------------------------------------------------
108 FEX0108 Online N2K-C2148T-1GE FOX1337GEYD
148 FEX148 Online N2K-C2248TP-1GE SSI143407R2
==========renumbering===========
33.03-5548UP(config-if)# int po148
33.03-5548UP(config-if)# no fex associate 148
33.03-5548UP(config-if)# no fex 148
33.03-5548UP(config)# int po148
33.03-5548UP(config-if)# fex associate 149
33.03-5548UP(config-if)# fex 149
========after renumbering=========
33.03-5548UP(config-fex)# show fex
FEX FEX FEX FEX
Number Description State Model Serial
------------------------------------------------------------------------
108 FEX0108 Online N2K-C2148T-1GE FOX1337GEYD
149 FEX0149 Registered N2K-C2248TP-1GE SSI143407R2
…………………..
33.03-5548UP(config-fex)# show fex
FEX FEX FEX FEX
Number Description State Model Serial
------------------------------------------------------------------------
108 FEX0108 Online N2K-C2148T-1GE FOX1337GEYD
149 FEX0149 Online N2K-C2248TP-1GE SSI143407R2
===dual homed FEX====
One fex goes to both switches running vPC.
The fex comes back online within minutes as well after applying changes on both sides.
===before change ====
33.02-5596UP# show fex
FEX FEX FEX FEX
Number Description State Model Serial
------------------------------------------------------------------------
108 FEX0108 AA Version Mismatch N2K-C2148T-1GE FOX1337GEYD -----------àplease ignore this state, we were running different versions on both N5K switches for testing.
132 Eth1/14 Online N2K-C2232PP-10GE SSI1350063S
======renumbering on both sides ========
33.02-5596UP(config)# int po108
33.02-5596UP(config-if)# no fex associate
33.02-5596UP(config-if)#
33.02-5596UP(config-if)# no fex 108
33.02-5596UP(config)#
33.02-5596UP(config)#
33.02-5596UP(config)# int po108
33.02-5596UP(config-if)# fex associate 109
33.02-5596UP(config-if)#
33.02-5596UP(config-if)# fex 109
========after change=========
33.02-5596UP(config-if)# show fex
FEX FEX FEX FEX
Number Description State Model Serial
------------------------------------------------------------------------
109 FEX0109 Online Sequence N2K-C2148T-1GE FOX1337GEYD
132 Eth1/14 Online N2K-C2232PP-10GE SSI1350063S
33.02-5596UP(config-if)# show fex
FEX FEX FEX FEX
Number Description State Model Serial
------------------------------------------------------------------------
109 FEX0109 Online N2K-C2148T-1GE FOX1337GEYD
132 Eth1/14 Online N2K-C2232PP-10GE SSI1350063S
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