The following table provides an overview of the significant changes up to this current release. The table does not provide an exhaustive list of all changes or of the new features up to this release.
Table 1 New Features and Changed Behavior in Cisco APIC
Cisco APIC Release Version
With this release, RS-FEC is supported for 25 Gbps ports.
Forwarding Error Correction (FEC) was introduced.
About Forwarding Error Correction
Forwarding Error Correction (FEC) is a method of obtaining error control in data transmission over an unreliable or noisy channel in which the source (transmitter) encodes the data in a redundant way using Error Correcting Code, and the destination (receiver) recognizes it and corrects the errors without requiring a retransmission. The available options are as follows:
CL74-FC-FEC—Supports 25 Gbps speed.
CL91-RS-FEC—Supports 25 and 100 Gbps speeds.
Inherit—The switch uses FEC based on the port transceiver type. All copper (CR4) transceivers have FC-FEC enabled on 25G. All interfaces with 100G transceivers have RS-FEC enabled.
The default is "Inherit".
FEC is only configurable on the front port and not on fabric ports.
1 For QSFP-100G-LR4-S / QSFP-100G-LR4 transceivers, FEC is disabled by default.
Configuring FEC Using the Advanced GUI
On the menu bar, click Fabric > Access Policies.
In the Navigation pane, expand Interface Policies > Policies, right click Link Level and click Create Link Level Policy.
In the Create Link Level Policy dialog box, perform the following actions:
In the Name field, enter a name for the policy.
Enter or choose the desired options for the remaining fields in the dialog box.
In the Forward Error Correction field, choose the desired FEC value.
The default is Inherit.
The Link Level Policy is created, and the desired FEC is configured with it.
To verify the configuration, in the Navigation pane, click Policies > Link Level . The Work pane, lists all the policies.
In the Work pane, choose the appropriate Link Level Policy, and verify in the Forward Error Correction column that the desired FEC is displayed.
Configuring FEC Using the Basic GUI
On the menu bar, click Fabric > Inventory.
In the Navigation pane, expand a Pod such as Pod 1, and in the Work pane, click the Configure tab, and click Add Switches.
In the Add Switches dialog box, choose the desired switch. Click Add Selected.
In the Work pane, from the switch displayed on the canvas, choose the desired port, and click the Configure Port tab.
In the Work pane, in the Interface area, from Forwarding Error Correction field drop-down list, choose the desired FEC option. Click Apply Changes and Submit Changes. The Forwarding Error Correction (FEC) is configured.
Click the Operational tab to view the properties of the physical interface, and verify that the Forwarding Error Correction field displays the desired value.