Segment Routing

EVPN Single-Homing Over Segment Routing

The EVPN Single-Homing feature utilizes the BGP MPLS-based Ethernet VPN functionality as defined in RFC 7432. For EVPN Single-Homing, a CE device is attached to a single PE device and has an Ethernet Segment.

In Cisco IOS XE Amsterdam 17.3.1 release, EVPN single-homing feature is supported over segment routing.

SR-TE Per-Flow (Class) ODN and Automated Steering (PCE Delegated)

This feature lets you steer traffic with SR-TE PFP based on the QoS markings on the packets. The traffic is then switched onto the appropriate path based on the forward classes of the packet. This feature is supported on the Cisco RSP2 and RSP3 modules.

Segment Routing Flexible Algorithm

Segment Routing Flexible Algorithm allows operators to customize IGP shortest path computation according to their own needs. Custom SR prefix-SIDs are assigned to forward the packets beyond link-cost-based SPF. As a result, a traffic engineered path is automatically computed by the IGP to any destination reachable by the IGP.

Segment Routing Performance Measurement Delay Measurement Using RFC 5357 (TWAMP Light)

This feature enables hardware timestamping. The Performance Measurement (PM) for link delay uses the light version of Two-Way Active Measurement Protocol (TWAMP) over IP and UDP defined in Appendix I of RFC 5357. TWAMP provides an alternative for interoperability when RFC 6374 is not used.

Segment Routing Performance Measurement End-to-End Delay Measurement

This feature allows to monitor the end-to-end delay experienced by the traffic sent over a Segment Routing policy. This feature ensures the delay does not exceed the specified threshold value and violate the SLAs. Use this feature to apply extended TE link delay metric (minimum delay value) to compute paths for Segment Routing policies as an optimization metric or as an accumulated delay bound.

Static Route Traffic Steering Using SR-TE Policy

This feature allows the non colored (BGP Extended Community) prefix to steer traffic over static policy. Prior to this release, only colored (BGP Extended Community) prefix could automatically steer traffic based on the defined policy using a tunnel interface. Unlike non colored prefix, this was possible only for the colored prefix as it could match the SR policy.

IPv4 static routes are now enhanced to leverage the SR policies to aid Segment Routing Traffic Engineering (SR-TE). This facilitates traffic steering for non colored prefix as you can now configure IP Static Route with SR static policy.

The following new keyword for the ip route command is introduced: segment-routing policy [policy name]

Telemetry (Model-Based Telemetry and Event-Based Telemetry) Support for Performance Measurement

This feature enables Model-Based Telemetry (MDT) and Event-Based Telemetry (EDT) that allow the data to be directed to a configured receiver. This data can be used for analysis and troubleshooting purposes to maintain the health of the network.

This feature is supported on Cisco ASR 900 RSP3 module. The sr_5_label_push_enable SDM template is mandatory for this feature to function.

Alarm Configuring and Monitoring Guide, Cisco IOS XE 17 (Cisco NCS 4200 Series)

Support for new alarm profile based on the Telcordia profile for chassis

The alarm profile based on Telcordia includes "Service Affecting" information for chassis entities. This information enables you to check the service affecting state for each alarm under a chassis.

Layer 2

RSPAN over VPLS Pseudowire Network

This feature allows the traffic mirroring destination port to be configured as a pseudowire rather than a physical port. This feature lets the designated traffic on the source port to be mirrored over the pseudowire to a remote location. This feature is supported on the Cisco RSP3 module.

MPLS Traffic Engineering Path Link and Node Protection

MPLS Point-to-Multipoint Traffic Engineering Support for Static Pseudowires

The Static Pseudowires over Point-to-Multipoint Traffic Engineering (P2MP TE) feature emulates the essential attributes of a unidirectional P2MP service. It can be used to transport layer 2 multicast services from a single source to one or more destinations.

Timing and Synchronization

Telemetry for GNSS Module

This feature provides externalization of operational data using Network Configuration Protocol (NETCONF) or Yet Another Next Generation (YANG) data modeling language.

Prior to this release, the traditional show commands were available to only view the GNSS statistic data. But, you could not use these show command outputs to manage network devices as demanded by centralized orchestration application such as Cisco Digital Network Architecture Center (DNAC).

The introduction of this feature helps to bring more visibility in the timing services operations. This feature is supported on Cisco ASR 900 RSP3 module.

1-Port OC-192 or 8-Port Low Rate CEM Interface Module

Interworking Multiservice Gateway Access Circuit Redundancy (iMSG ACR) support for NCS 4200 Combo 8-Port SFP GE and 1-Port 10 GE 20G Interface Module (NCS4200-1T8S-20CS)

The iMSG ACR feature is supported on serial interfaces for SONET and SDH ACR. DCC and MS features are also supported.

Pseudowire Scale Support

A maximum of 26,880 CEM Pseudowires are supported on the 1-Port OC-192 or 8-Port Low Rate CEM interface module. This feature is supported on the Cisco RSP3 module.

ACR and DCR Scale Support

Adaptive Clock Recovery (ACR) and Differential Clock Recovery (DCR) are techniques used for Circuit Emulation (CEM) to recover clocks on the Cisco RSP3 module.

DCC Support

The Data Communication Channel (DCC) feature uses the SONET or SDH Operation Administration and Maintenance (OAM) channel to manage devices that support SONET or SDH interfaces on the Cisco RSP3 module.

1 port OC-48/STM-16 or 4 port OC-12/OC-3 / STM-1/STM-4 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module

IP Interworking with VLAN Handoff

VLAN handoff enables the support for IP interworking Pseudowire. IP interworking Pseudowire enables the service provider to terminate the TDM circuit early in the network and transport the IP payload on HDLC, PPP, or MLPPP links, over the MPLS core to the Ethernet network.

Interworking Support for nxDS0

Interworking function (IWF) for PPP/HDLC is supported on Ethernet for E1/STM1 ports. This support is extended at nxDS0 level to speed up the GSR TDM migration.

MLPPP ACR support for IPv4 or IPv6 Interworking Multiservice Gateway (iMSG)

MLPPP ACR is supported for IPv4 or IPv6 iMSG on the Cisco RSP3 module. The restrictions for MLPPP interworking are applicable to iMSG ACR.

IP Multicast: Multicast

Aggregated Interface Statistics on Bundle

Aggregate multicast packet count is implemented for all the (S,G) entries for which the given BDI serves as the OIF.

Native Multicast SLA Measurement with MLDP

Outgoing interface (OIF) statistics in a native multicast setup implements an extra output to include the packet count sent over the (S,G) entry and the traffic rate.

Quality of Service

CoS Conditional Marking

This feature lets you implement the CoS marking on the basis of the Traffic class and the Drop precedence. This feature is supported on the Cisco RSP3 module.