Ethernet Fabric (VDX, CNA)

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New Contributor
Posts: 2
Registered: ‎10-03-2012

Errors and discards on fabric ports

Is it normal to have very slowly incrementing Errors and discards on uplink ports between my VDX6730's and all my VDX6710's?

I have gone over both of our datacenter's VCS Fabric's and am seeing the same behavior on both sites, on all VDX's

I do a show interface | inc Errors, and her is a bit of the output (the ones with errors are the fabric/uplink ports.)

Errors: 0, Discards: 0

Errors: 0, Discards: 10008, TrillportCtrlFrames: 25970107

Errors: 0, Discards: 0, TrillportCtrlFrames: 4640199713

Errors: 0, Discards: 0

Errors: 0, Discards: 0

Errors: 0, Discards: 5051, TrillportCtrlFrames: 27790600

Errors: 0, Discards: 0, TrillportCtrlFrames: 6531261742

Errors: 0, Discards: 38674, TrillportCtrlFrames: 27026172

Errors: 36359, Discards: 1, TrillportCtrlFrames: 11972162267

Errors: 0, Discards: 0

Errors: 0, Discards: 0

Errors: 0, Discards: 0

Errors: 0, Discards: 0

Errors: 0, Discards: 17520, TrillportCtrlFrames: 30689153

Errors: 36936, Discards: 3, TrillportCtrlFrames: 10120015043

New Contributor
Posts: 2
Registered: ‎10-03-2012

Re: Errors and discards on fabric ports

So Our Brocade SE worked with Engineering to help us to resolve this one. Here is what he Sent

If you see RX Discards incrementing on ISL links, then the congestion is on egress direction on edge ports.

-          May need to deploy flow-control on only edge ports

If you see RX Discards incrementing on Edge ports, then the congestion is egress direction on ISL ports.

-          May need to deploy flow-control on edge ports as well as enable the PFC for that COS traffic across ISL links.

He had me enable flow control on all edge-ports on all the VDX's in the fabric with the command:

qos flowcontrol tx on rx on


After enabling this throughout the fabrix, the errors and discards Ceased.

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