Cisco IOS XE release 16.11 provides enhanced support for Cisco Internet of Things (IoT) Switches.

For more information, see the Cisco Catalyst IE 3200, 3300, Rugged Series, Cisco IOS XE 16.11.1 Software Configuration Guide.

New and Changed Information

Cisco Catalyst IE 3200 and 3300 Rugged Series Switches

The Cisco Catalyst IE 3x00 Series Switch is our next generation modular din rail Switching platform.

Cisco IOS XE Release 16.11.1

New Software Features in IOS XE Release 16.11

Release 16.11 introduces the following new software features for IoT Devices:

  • FastREP


  • Routed port support

  • Programmability

  • Packet Capturer

  • Install Boot Support

  • SUDI 2099, Software LED, Uplink 100MB SFP, Advanced Fiber Support

  • Smart Licensing

  • Advanced Fiber Module Support

  • Locate switch

Known Issues

This section contains information about the known issues in this release.

IGMP Snooping and Unregistered Multicast Packet Forwarding

  • Symptoms: Although the mrouter port is configured and multicast receivers have sent igmp-joins to listen to registered multicast streams, unknown multicast streams that ingress the switch are forwarded to all the ports. The flooding may lead to reduction in bandwidth for registered multicast traffic.

  • Conditions: The issue occurs when the switch receives unregistered multicast packets with a pure L2 configuration and an external IGMP snooping querier is configured on the VLAN. There should not be a membership join received on any VLAN ports.

  • Workaround: To stop the VLAN, execute the command switchport block multicast on that interface, as shown in the following example:
    Switch#configure terminal
    Enter configuration commands, one per line.  End with CNTL/Z.
    Switch(config)#interface gigabitEthernet 1/10
    Switch(config-if)#switchport block ?        
      multicast  Block unknown multicast addresses
      unicast    Block unknown unicast addresses
    Switch(config-if)#switchport block mu
    Switch(config-if)#switchport block multicast  

Open Caveats

This section contains open caveats for this release.

Table 1. Open Caveats




High CPU utilization observed IE3x00 when netflow policy is enabled


IP traffic is not getting accounted - sh ip traffic interface < interface >.


No end-to-end link link w/ GLC-T, need shut/no shut (IE3200 uplinks)


Device does not adhere to its policy-map when oversubscribed


Console hangs for few seconds while converting range of ports as routed ports


REP - High IOS convergence is seen on hellcat's Ten Gig Ports & FastRep convergence issue

Resolved Caveats

This section contains resolved caveats for this release.

Table 2. Resolved Caveats




100 MB SFP insertion/removal issues with uplinks on some boards


REP: Unable to configure admin vlan per segment.


ARP probes generated by Device tracking feature wouldn't be unicast.


Applying ACLs on EtherChannel/PortChannel/LAG interfaces is not blocked. Yet has no effect.


Incomplete and duplicate info in \"show version installed\" output.


STP and REP links are flapping or broken when traffic rate is greater than configured priority rate.


Some express setup temporary config remain present even after quick disconnection of cable.


Device classifier with snooping features (IGMP,MLD,DHCP) will drop respective control packets.


After ExpressSetup, Gi1/3 continues to retain mode access, ip arp inspection commands after reload.


Industrial special QoS egress classification is missing in cisco-ie-global policy.


QoS egress bandwidth allocation and EF flow put into low priority queue.


REP interface bounces with high CPU utilization.


SG: Subint programming on standby shows ERRORed out post switchover.

Cisco IOS XE Release 16.11.1a

New Software Features in IOS XE Release 16.11.1a

Release 16.11.1a introduces support for the following new IoT Devices:

  • Catalyst IE 3400 Fiber Adv Exp Module (IEM-3400-8S= )

  • Catalyst IE 3400 GE Adv Exp Module(IEM-3400-8T=)

  • IE 3400 Non PoE PID (IE-3400-8T2S-E)

Open Caveats

This section contains open caveats for this release.

Table 3. Open Caveats




Jumbo frames not working on Advanced SKU.


Petra: Show inventory details needs to be unique for Adv Non-poe


Traceback seen after express setup in IE3400-8T2S


initial configuration dialog option not received when boot with emgy0 partition

Cisco Support

If you have any questions or require assistance, please contact Cisco Support:

  • Visit the Cisco Support site at .

  • Email Cisco Support at

  • Call Cisco Support at 1.408.526.7209 or 1.800.553.2447.