Link Debounce

The Link Debounce Timer delays notification of a link up or down status change. Delayed notification of a link status change can decrease traffic loss due to network reconfiguration when network ethernet port experiences minor faults in the link. The Link Debounce Up Timer is a new enhancement of the feature which delays notification of a link from down to up status change.

The feature was implemented on Cisco Catalyst 9600 Series Supervisor 2 Module at the global level only. Per port configuration is not supported.

Serviceability: Embedded Packet Capture on Control-Plane Interface

Embedded Packet Capture is supported on control plane packets.

The feature is implemented on Cisco Catalyst 9600 Series Supervisor 2 Module.

See Network Management → Configuring Packet Capture.

(Network Essentials)

Serviceability: Embedded Packet Capture on Layer 2 Interfaces

Embedded Packet Capture is supported on Layer 2 Interfaces.

The feature is implemented on Cisco Catalyst 9600 Series Supervisor 2 Module.

See Network Management → Configuring Packet Capture.

(Network Essentials)

Serviceability: Enhanced Drop Detection

Enhanced Drop Detection allows you to determine the reasons for packets being dropped.

The feature is implemented on Cisco Catalyst 9600 Series Supervisor 2 Module.

See Network Management → Configuring Enhanced Drop Detection and Enhanced Packet Drop Analyzer.

(Network Essentials)

Serviceability: Packet Drop Analyzer

Packet Drop Analyzer allows you to configure traps to punt dropped packets to a CPU based destination for the purpose of debugging.

The feature is implemented on Cisco Catalyst 9600 Series Supervisor 2 Module.

See Network Management → Configuring Enhanced Drop Detection and Enhanced Packet Drop Analyzer.

(Network Essentials)

Cisco 100GBASE QSFP-100G Modules

Supported transceiver module product numbers:

• QSFP-100G-SR1.2

Compatible line cards:

• C9600-LC-24C, C9600-LC-40YL4CD and C9600X-LC-32CD line cards on Cisco Catalyst 9600X Supervisor Module 2 (C9600X-SUP-2)

• C9600-LC-24C and C9600-LC-40YL4CD line cards on Cisco Catalyst 9600 Supervisor Module 1 (C9600-SUP-1)

For information about the modules, see Cisco 100GBASE QSFP-100G Modules Data Sheet. For information about device compatibility, see the Transceiver Module Group (TMG) Compatibility Matrix.

Supported transceiver module product numbers:

• QSFP-100G-ZR4-S

Compatible line cards:

• C9600-LC-24C, C9600-LC-40YL4CD and C9600X-LC-32CD line cards on Cisco Catalyst 9600X Supervisor Module 2 (C9600X-SUP-2)

For information about the modules, see Cisco 100GBASE QSFP-100G Modules Data Sheet. For information about device compatibility, see the Transceiver Module Group (TMG) Compatibility Matrix.

BGP EVPN VXLAN

• ARP inspection and DHCP Rogue Server Protection in VXLAN Environment (L2 VNIs)

• BGP EVPN VRF Auto RD and Auto RT

The following BGP EVPN VXLAN features are introduced in this release:

• ARP inspection and DHCP Rogue Server Protection in VXLAN Environment (L2 VNIs): BGP EVPN VXLAN fabric now supports ARP inspection and DHCP Rogue Server Protection. To configure these features, enable ARP inspection and DHCP Snooping on the VTEPs of the EVPN VXLAN fabric.

• BGP EVPN VRF Auto RD and Auto RT: BGP EVPN Layer 3 overlay VRF configuration is simplified with the introduction of new CLIs to auto generate the route distinguisher (RD) and route target (RT) for a VRF.

  You can enable the auto generation of RD either at a global level, using the vrf rd-auto command or specifically for a VRF, using the rd-auto [disable] command in the VRF submode.

  To enable auto assignment of RT for a VRF, use the vnid vni-id command in the VRF submode.

  You can also choose to disable the auto RD and RT features by using the no form of the command.

DSCP marking for RADIUS packets for administrative sessions

Allows you to configure DSCP marking for RADIUS packets for administrative sessions such as SSH and Telnet.

(Network Essentials)

Interface ID Option in DHCPv6 Relay Message

Introduces support for interface ID option in DHCPv6 Relay message. With this, the physical interface details of the client interface are included along with the VLAN number in the message.

(Network Essentials and Network Advantage)

Interface Template Support for IPv6 DHCP Guard

Enables you to add the ipv6 dhcp guard attach-policy policy_name global configuration command to an interface template. IPv6 DHCP Guard is then enabled and the policy is applied, wherever the template is applied.

(Network Advantage)

IP DHCP Server Changes to Limit IP Assignment to Next Hop only

Allows you to assign DHCP IP address only to the neighbouring device in an interface using the ip dhcp restrict next hop command. When this command is enabled, the DHCP server in the interface uses the MAC addresses in the DHCP packet and compares it with the addresses in the Cisco Discovery Protocol (CDP) or Link Layer Discovery Protocol (LLDP) cache table. If the MAC addresses match, then the DHCP IP address is assigned to that device.

(Network Advantage)

Modified Trustpoints for Secure Unique Device Identity (SUDI) Certificates

Starting from Cisco IOS XE Dublin 17.12.1, the following changes have been introduced for trustpoints.

• Trustpoint names for existing SUDI certificates

  If your device supports Cisco Manufacturing CA III certificate and is not disabled, the trustpoint names are as follows.

  • For Cisco Manufacturing CA III certificate, the trustpoint name has changed from CISCO_IDEVID_SUDI to CISCO_IDEVID_CMCA3_SUDI

  • For Cisco Manufacturing CA SHA2 certificate, the trustpoint name has changed from CISCO_IDEVID_SUDI_LEGACY to CISCO_IDEVID_CMCA2_SUDI

  If your device does not support Cisco Manufacturing CA III certificate or if the certificate is disabled using no platform sudi cmca3 command, the trustpoint names are as follows.

  • For Cisco Manufacturing CA SHA2 certificate, the trustpoint name has changed from CISCO_IDEVID_SUDI to CISCO_IDEVID_CMCA2_SUDI

  • For Cisco Manufacturing CA certificate, the trustpoint name has changed from CISCO_IDEVID_SUDI_LEGACY to CISCO_IDEVID_CMCA_SUDI

• Hardware SUDI certificates

  • If your device supports High Assurance SUDI CA certificate, this certificate is loaded under CISCO_IDEVID_SUDI trustpoint.

  • If your device does not support High Assurance SUDI CA certificate, ACT2 SUDI CA certificate is loaded under CISCO_IDEVID_SUDI trustpoint.

• show ip http server status command output

  If you configure the trustpoint for the HTTP server as CISCO_IDEVID_SUDI, the output of show ip http server status command displays the operating trustpoint along with the configured trustpoint.

  The following example shows a sample output of show ip http server status command with both the configured and the operating trustpoint names. Note that if your device does not support Cisco Manufacturing CA III certificate or if the certificate is disabled, the operating trustpoint in the below output displays CISCO_IDEVID_CMCA2_SUDI.

  Device# show ip http server status
  …
  HTTP secure server trustpoint: CISCO_IDEVID_SUDI
  HTTP secure server operating trustpoint: CISCO_IDEVID_CMCA3_SUDI
  

  (Network Essentials)

Optimized Layer 2 Overlay Multicast for IPv4 and IPv6 traffic

Optimized Layer 2 Overlay Multicast forwards multicast traffic within the Layer 2 Virtual Network Instance (L2VNI).

Support for optimized Layer 2 overlay multicast was introduced on the Cisco Catalyst Series Supervisor 2 Module (C9600X-SUP-2).

(Network Advantage)

Programmability:

• NETCONF-SSH Algorithms

• YANG Data Models

The following programmability features are introduced in this release:

• NETCONF-SSH Algorithms: The NETCONF-SSH server configuration file contains the list of all supported algorithms. From this release onwards, you can enable or disable these algorithms at runtime by using Cisco IOS commands or YANG models.

  (Network Essentials)

• YANG Data Models: For the list of Cisco IOS XE YANG models available with this release, navigate to: https://github.com/YangModels/yang/tree/master/vendor/cisco/xe/17121.

  (Network Advantage)

show idprom tan command

The show idprom tan command was introduced. It displays the top assembly part number and top assembly part revision number for the identification programmable read-only memory.

There are no new WebUI features in this release.