4500x support for GLC-LH-SMD DOM (10 Gbit modules work fine, but not 1 Gbit)

[Jim Matuska]

Do the 4500x switches support DOM capability for GLC-LH-SMD modules?  The 10Gbit LR modules work fine to provide DOM readings with the "show interface transceiver" command but the 1 Gbit modules do not show any DOM readings.  

We are running version 03.06.06.E IOS-XE with the enterprise license.  

What do you think? 

[Georg Pauwen · Accepted solution]

Hello,

according to the matrix linked below, you need to run 3.7.2E for DOM suppport on the GLC-LH-SMD:

https://www.cisco.com/c/en/us/td/docs/interfaces_modules/transceiver_modules/compatibility/matrix/GE_Tx_Matrix.html#_Toc513557452

[Jim Matuska]

Thanks for the info.  

Is it possible to upgrade a 4500x to 3.7.2E on the 4500x non disruptively or would i have to reboot the switches to get the new software to load?  

[Leo Laohoo]

There is, really, no such thing as "non-disruptive" IOS upgrade.
What can be done is minimizing the time it takes by taking steps, like VSS/Stack Virtual or HSRP or Etherchannel.

[Jim Matuska]

We are running vss between the 2 4500x's but some devices only have one uplink so they will still experience an outage.  I thought some of the newer IOS types supported online upgrades but I guess the 4500x's aren't one of them. 

[Jim Matuska]

What about using an ISSU Upgrade?  From what I am reading it seems like that is possible with a 4500x VSS stack with our version of IOS XE. 

[Leo Laohoo]

You could give it a try.  

Personally, don't use ISSU/FSU/eFSU.

[Reza Sharifi]

Agree with Leo.

ISSU is long, painful and at the end, you could have a longer outage than the simple reboot.

Get a maintenance window and reboot both at the same time and you will be done in less than 10 minutes.

HTH

[Jim Matuska]

Thanks for the info everyone.  Since these are in a VSS stack do you upgrade like you would on a 3850 stack and upload the upgrade file to one switch and run the installer there or do you run the image installer separately for each switch in the vss stack?  

[Leo Laohoo]

For a 4500 in a VSS, it's as simple as copying the IOS to the primary and stand-by supervisor cards, change the boot variable string, save the config and reboot.