Cisco 9500 stackwise-virtual : problem with stackwise virtual link

[marzi]

Hi all

I need to form a stackwise virtual, using two cisco 9500-48Y4C with IOSXE Version 17.15.03.

For now, I've only two QSFP 40G LR4 SFP, so I can create only one switch virtual link.
Anyway I would to prepare another couple of port for further switch virtual link.

My configuration is :
Switch(config)#interface range hu1/0/51-52
Switch(config-if-range)#stack
Switch(config-if-range)#stackwise-virtual link 1

I receive the follow error message :

WARNING: Interface HundredGigE1/0/52 could not be added to stackwise-virtual link 1
The speed of the interface HundredGigE1/0/52 does not match the speed of the existing interface(s) on stackwise-virtual link 1
Check the output of 'show stackwise-virtual link' to see the mismatched speeds
% Interface range command failed at HundredGigE1/0/52
Exiting from range submode without applying rest of the commands in range to avoid unwanted issues

I'm sure that there are not difference between the Hu1/0/52 of the switch1 and switch2 (Hu1/0/51 is not connected for now)

Switch2#show interfaces Hu1/0/52 status

Port Name Status Vlan Duplex Speed Type
Hu1/0/52 connected 1 full 40G QSFP 40G LR4 SFP

Switch1#show interfaces Hu1/0/52 status

Port Name Status Vlan Duplex Speed Type
Hu1/0/52 connected 1 full 40G QSFP 40G LR4 SFP

The speed can't be forced to 40000G.

Is there anyone that have experience of this problem ?
Could be a bug ?

Thanks in advance

fabrizio

[balaji.bandi · Accepted solution]

 (Hu1/0/51 is not connected for now)

What SFP on this port - can you post show interface hun1/0/51 and same 1/0/52

How about trying normally instead of the range command?

interface hu1/0/52
 stackwise-virtual link 1

If you are short on SFPs, make 1 port with a command, remove the SFP, add it to another port, and complete the configuration. That should work. 

[marzi]

Hi balaji

Thank for your replay,

I'll do it and will update the community.

I've only one question :

Yes, I can try configuring only one port, but in the future will be possible to double the virtual link without a reload of the stackwise virtual ?

[balaji.bandi]

Yes, you can add if that is your requirement without reloading the SVL domain switches.

[marzi · Accepted solution]

I fixed my problem recovering other two QSFP 40 G compliting the configuration as manual says

Other solution doesn't works

Thanks for all

Have a nice day

Fabrizio