Cisco IOS XE Cupertino 17.7.1
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SR with OSPF
Point-to-Multipoint Non Broadcast Mode
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This feature enables SR on Point-to-Multipoint (P2MP) Non
Broadcast (NB) mode, where you can manually configure neighbor
IP address and OSPF sends hello packet using the neighbor
unicast address.
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SR-PCE: Support for
PCE-Initiated SR Policy and ISIS Autoroute
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This feature enables System-to-Intermediate System (IS-IS)
interaction with traffic engineering to receive the SR-TE
policies via autoroute announcement notification. These
notifications are used as IGP shortcuts during SPT computation
and route calculation and are installed as nexthops for
applicable routes in Routing Information Base (RIB) or MPLS
Forwarding Infrastructure (MFI).
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Cisco IOS XE Bengaluru 17.6.1
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EVPN-IRB DHCP v4 and v6 Relay over Segment Routing
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This feature introduces a specialised implementation of DHCP packets to support DHCPv4 and DHCPv6 in an EVPN Fabric with Distributed
Anycast Gateways (DAGs) on the same Virtual Routing and Forwarding (VRF). It also avoids DHCP discovery packet floods across
the fabric.
The flooding suppression feature is also enhanced to intercept multicast or broadcast DHCP packets when DHCP relay is configured
on the DAG to perform the required action and localize the scope of the service.
This feature is not supported with Cisco ASR RSP3 module. It is only supported with Cisco ASR RSP2 module.
This feature is only supported on NCS 4206 and NCS 4201/4202 routers.
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IS-IS Flexible Algorithm Include Affinity Support
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This feature supports "include-any" and "include-all" affinities in IS-IS. Prior to Cisco IOS XE Bengaluru 17.6.1 release,
only Flexible Algorithm affinity "exclude-any" was supported.
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OSPF Flexible Algorithm (Ph2): Topology-Independent Loop-Free Alternate (TI-LFA) Path
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This feature allows you to configure the Loop-Free Alternate (LFA) and TI-LFA backup or repair paths for a Flexible Algorithm.
The backup path is computed based on the constraints and metrics of the primary path. Prior to Cisco IOS XE Bengaluru 17.6.1,
OSPF Flexible Algorithm supported only the primary path.
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SR-PCE: Enabling SR PM Delay or Liveness for PCE-Initiated Policies
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This feature enables the Path Computation Element (PCE) that can provision a Segment Routing Traffic Engineering (SR-TE) policy
to mitigate link congestion. Prior to this release, you could only enable PM link and delay measurement using CLI-based policies.
Starting with this release, you can also use PCE to enable PM link and delay measurement.
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Stitching of Subnet Route from EVPN to L3VPN
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This feature introduces the collpased spine and border leaf node in the network topology of single homing DAGs with symmetric
IRB, inter-subnet layer 3 traffic within fabric and inter-subnet layer 3 stitching through layer 3 border gateway. The hosts
participating in fabric IRB are directly attached with the collapsed spine and border leaf node.
This feature is not supported with Cisco ASR RSP3 module. It is only supported with Cisco ASR RSP2 module.
This is only supported on NCS 4206 and NCS 4201/4202 routers.
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Cisco IOS XE Bengaluru 17.5.1
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ECMP over SR-TE
Policy
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This feature allows you to configure ECMP over SR-TE policies. In
case of multiple paths, this feature enables mitigation of local
congestion through load balancing.
This feature is supported on Cisco RSP3 module.
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EVPN Integrated Routing and Bridging (L2 and L3 Anycast Gateway) and Data Center Interconnect or Border Leaf (Single Homing)
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This feature allows the devices to forward both layer 2 or bridged and layer 3 or routed traffic providing optimum unicast
and multicast forwarding for both intra-subnets and inter-subnets within and across data centers. Data Center Interconnects
(DCI) products are targeted at the Edge or Border Leaf (BL) of data center environments, joining data centers to each other
in a point-to-point or point-to-multipoint fashion, or at times extending the connectivity to internet gateways or peering
points.
This feature is supported on Cisco NCS 4206/4216 routers.
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SR-PM Delay Deduction
(Loopback Mode)
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This feature improves the SR-PM detection time as the PM probes
are not punted on the remote nodes. Also, it does not a require
a third-party support for interoperability.
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SR-TE PM: Liveness of SR
Policy Endpoint
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This feature enables Performance Measurement (PM) liveness
detection and delay measurement for an SR policy on all the
segment lists of every candidate path that are present in the
forwarding table using PM probes. Thus, you can easily monitor
the traffic path and efficiently detect any drop of traffic due
to cable or hardware or configuration failures.
This feature provides the following benefits:
- [/bookmap/reference/refbody/section/table/tgroup/tbody/row/entry/ul/li/p
{"p"}) End-to-end liveness is verified before activating the candidate path in the forwarding table. (p]
- [/bookmap/reference/refbody/section/table/tgroup/tbody/row/entry/ul/li/p
{"p"}) End-to-end liveness failure can trigger re-optimization to another path by deactivating the current path. (p]
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Segment Routing Flexible
Algorithm with OSPF
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This feature allows you to configure Segment Routing Flexible
Algorithm with OSPF. Flexible Algorithm with OSPF supports
metric minimization and avoidance, multi-plane, delay metric
with rounding, and ODN with auto-steering.
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Segment Routing Policy
Counters
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This feature enables statistic counters to be displayed when
traffic passes over the SR-TE tunnel.
You can use the command show segment-routing
traffic-eng policy name
policy name
to view the counters.
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Cisco IOS XE Bengaluru 17.4.1
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L2VPN over SR-TE Preferred Path
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This feature allows you to configure an SR policy as the preferred path for a VPWS or VPLS pseudowire. VPWS or VPLS pseudowires
between same PEs can be routed over different SR policies based on the requirements. Prior to this release, you could only
steer the traffic using the SR policy for routing IPv4 traffic to a destination pseudowire (over IGP or BGP-LU).
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PCE Initiated SR Policy with OSPF Autoroute Announce
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This feature enables a steering mechanism in which IGPs automatically use the policy for destination's downstream of the policy
end point.
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Segment Routing Flexible Algorithm support for TI-LFA uLoop Avoidance, SID Leaking, and ODN with Auto-Steering
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This feature allows you to compute Loop Free Alternate (LFA) paths, TI-LFA backup paths, and Microloop Avoidance paths for
a particular Flexible Algorithm using the same constraints as the calculation of the primary paths for such Flexible Algorithms,
for IS-IS. See Calculation of Flexible Algorithm Path.
Inter-area leaking of Flexible Algorithm SIDs and prefixes and selectively filtering the paths that are installed to the MFI
are also supported. See Flexible Algorithm Prefix-SID Advertisement and Installation of Forwarding Entries for Flexible Algorithm Paths.
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Telemetry (Model-Based Telemetry and Event-Based Telemetry) Support for Performance Measurement
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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. The sr_5_label_push_enable SDM template is mandatory for this feature to function.
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Cisco IOS XE Amsterdam 17.3.1
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EVPN Single-Homing Over Segment Routing
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The EVPN Single-Homing feature utilizes the BGP MPLS-based Ethernet VPN functionality as defined in RFC 7432. For EVPN Single-Homing
feature, a CE device is attached to a single PE device and has an Ethernet Segment.
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SR-TE Per-Flow (Class) ODN and Automated Steering (PCE Delegated)
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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.
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Segment Routing Flexible Algorithm
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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.
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Segment Routing Performance Measurement Delay Measurement Using RFC 5357 (TWAMP Light)
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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.
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Segment Routing Performance Measurement End-to-End Delay Measurement
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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.
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Static Route Traffic Steering Using SR-TE Policy
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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].
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Telemetry (Model-Based Telemetry and Event-Based Telemetry) Support for Performance Measurement
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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.
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Cisco IOS XE Amsterdam 17.1.1
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EVPN-VPWS Single Homing over Segment Routing
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EVPN-VPWS single homing is a BGP control plane solution for point-to-point services. It has the ability to forward traffic
from one network to another using Ethernet Segment without MAC lookup. EVPN-VPWS single homing works on both IP and SR core.
IP core is used to support BGP while the SR core is used to switch packets between the endpoints.
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Segment Routing Low Latency Network Slice
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This feature allows the advertisement and reception of the extended TE link delay metrics without any additional configuration
required in IS-IS, OSPF or BGP-IS. When the link delay values are configured, they are flooded in the PCE topology and when
the path computation is requested, these values are used for path calculation.
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Segment Routing Performance Measurement Link Delay Metrics
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Network performance metrics such as packet loss, delay, delay variation, and bandwidth utilization is a critical measure for
traffic engineering (TE) in service provider networks. These metrics provide network operators with information about characteristics
of their networks for performance evaluation and helps to ensure compliance with service level agreements. The service-level
agreements (SLAs) of service providers depend on the ability to measure and monitor these network performance metrics.
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SR-TE Policy for MPLS TE
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The Cisco ASR 900 Series routers with Cisco RSP2 module support the newer segment routed Traffic Engineering (SR-TE) policy
and you can enbale the policy using the segment-routing traffic-eng command.
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SR-TE ODN Color Extended Community for Layer 3 VPN
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The Cisco ASR 900 Series routers with Cisco RSP2 module support the color extended community with the following feature support:
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