Stacking strange behavior

[Julian_Eble]

Hello,

I've 2 X670G2-48x-4q with version 16.1.3.6 patch1-7 and they're stacked each other.

There're two QSFP cables connected in the ports 57 and port 61 ( suppose to be 80G), but after checking the stack-ports some really strange thing comes up.

Stack Topology is a RingSlot Port Select Node MAC Address Port State Flags Speed
---- ---- ------ ----------------- ----------- ----- -----
*1 1 Native 00:04:96:9a:8d:2f Operational CB 20G
*1 2 Native 00:04:96:9a:8d:2f Operational C- 20G
2 2 Native 00:04:96:9a:74:1f Operational C- 20G
2 1 Native 00:04:96:9a:74:1f Operational CB 20G
* - Indicates this node
Flags: (C) Control path is active, (B) Port is Blocked

Why they're connected by 20G?
Why is there blocked ports?

Thanks,

[Patrick_Voss]

The v160 will double the bandwidth and will work in your current setup.

[Julian_Eble]

So, if I want to use the other 2 ports, the V160 should be fine, right?

[Chad_Smith1]

Just to clarify, as Stephane said below, you need to use 4 40G connections for v320. So if you need those other 40G ports for some other purpose, then v320 may not be ideal.

The VXXX stacking numbers are based on all ports ingress and egress. So:

V160 = 40G port * 2 ports * 2 (ingress and egress)
V320 = 40G port * 4 ports * 2 (ingress and egress)

[Julian_Eble]

Thanks for the info, I'm going to change that.

[Chad_Smith1]

Yes I believe v320 is the best option for you. You are already connecting the nodes with 40G cables so you might as well use all the bandwidth.