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,

[Stephane_Grosj1]

You were mislead by the V80 denomination. Using the 40G port at normal speed is V160, and you can go to V320 if using all 4x 40G ports. This V80 mode is for interconnection with V80 module present on x460G1. Between x670 (G2 or not), you shouldn't configure V80.

The blocked state is to prevent a loop to happen. This is only for broadcast traffic (while multicast is blocked on a per group basis). Unicast traffic can use any link (it will choose the fastest one).

[Julian_Eble]

"Unicast traffic can use any link (it will choose the fastest one)."

So it's not going to load balance?

[Julian_Eble]

Is there any cons to use directly to v320 ?

The lab is to test the other port that is not forwarding the traffic?

I'll schedule a new maintance window to do these changes.

[Chad_Smith1]

Yes V160 is perfectly fine, if you need the other ports for some other purpose.