Configure Performance Measurement

Network performance metrics is a critical measure for traffic engineering (TE) in service provider networks. Network performance metrics include the following:

Packet loss
Delay
Delay variation
Bandwidth utilization

These network performance metrics provide network operators information about the performance characteristics of their networks for performance evaluation and help 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. Network operators can use Segment Routing Performance Measurement (SR-PM) feature to monitor the network metrics for links and end-to-end TE label switched paths (LSPs).

The following table explains the functionalities supported by performance measurement feature for measuring delay for links.

Table 1. Performance Measurement Functionalities
Functionality	Details
Profiles	You can configure different default profiles for different types of delay measurements. Use the "interfaces" delay profile type for link-delay measurement. Delay profile allows you to schedule probe and configure metric advertisement parameters for delay measurement.
Protocols	Two-Way Active Measurement Protocol (TWAMP) Light (using RFC 5357 with IP/UDP encap).
Probe and burst scheduling	Schedule probes and configure metric advertisement parameters for delay measurement.
Metric advertisements	Advertise measured metrics periodically using configured thresholds. Also supports accelerated advertisements using configured thresholds.
Measurement history and counters	Maintain packet delay and loss measurement history, session counters, and packet advertisement counters.

Measurement Modes

The following table compares the different hardware and timing requirements for the measurement modes supported in SR PM.

Table 2. Measurement Mode Requirements
Measurement Mode	Sender: PTP-Capable HW and HW Timestamping	Reflector: PTP-Capable HW and HW Timestamping	PTP Clock Synchronization between Sender and Reflector
One-way	Required	Required	Required
Two-way	Required	Required	Not Required

One-Way Measurement Mode

One-way measurement mode provides the most precise form of one-way delay measurement. PTP-capable hardware and hardware timestamping are required on both Sender and Reflector, with PTP Clock Synchronization between Sender and Reflector.

Delay measurement in one-way mode is calculated as (T2 – T1).

The PM query and response for one-way delay measurement can be described in the following steps:

The local-end router sends PM query packets periodically to the remote side once the egress line card on the router applies timestamps on packets.
The ingress line card on the remote-end router applies time-stamps on packets as soon as they are received.
The remote-end router sends the PM packets containing time-stamps back to the local-end router.
One-way delay is measured using the time-stamp values in the PM packet.

Two-Way Measurement Mode

Two-way meaurement mode provides two-way measurements. PTP-capable hardware and hardware timestamping are required on both Sender and Reflector, but PTP clock synchronization between Sender and Reflector is not required.

Delay measurement in two-way mode is calculated as ((T4 – T1) – (T3 – T2))/2

The PM query and response for two-way delay measurement can be described in the following steps:

The local-end router sends PM query packets periodically to the remote side once the egress line card on the router applies timestamps on packets.
Ingress line card on the remote-end router applies time-stamps on packets as soon as they are received.
The remote-end router sends the PM packets containing time-stamps back to the local-end router. The remote-end router time-stamps the packet just before sending it for two-way measurement.
The local-end router time-stamps the packet as soon as the packet is received for two-way measurement.
Delay is measured using the time-stamp values in the PM packet.

Link Delay Measurement

Table 3. Feature History Table
Feature Name	Release Information	Feature Description
Segment Routing Performance Measurement for Link Delay Measurement on Link Bundles	Release 7.2.2	This enhancement introduces support for using link bundles with Segment Routing Performance Measurement link delay measurement A link bundle is a group of one or more ports that are aggregated together and treated as a single link. Link bundles allow you to group multiple point-to-point links together into one logical link and provide higher bidirectional bandwidth, redundancy, and load balancing between two routers.

The PM for link delay uses the IP/UDP packet format defined in RFC 5357 (TWAMP-Light) for probes. Two-Way Active Measurement Protocol (TWAMP) adds two-way or round-trip measurement capabilities. TWAMP employs time stamps applied at the echo destination (reflector) to enable greater accuracy. In the case of TWAMP Light, the Session-Reflector doesn’t necessarily know about the session state. The Session-Reflector simply copies the Sequence Number of the received packet to the Sequence Number field of the reflected packet. The controller receives the reflected test packets and collects two-way metrics. This architecture allows for collection of two-way metrics.

Usage Guidelines and Restrictions for PM for Link Delay

The following restrictions and guidelines apply for the PM for link delay feature for different links.

For broadcast links, only point-to-point (P2P) links are supported. P2P configuration on IGP is required for flooding the value.
For link bundles, the hashing function may select a member link for forwarding but the reply may come from the remote line card on a different member link of the bundle.
For one-way delay measurement, clocks should be synchronized on two end-point nodes of the link using PTP.

Configuration Example: PM for Link Delay

This example shows how to configure performance-measurement functionalities for link delay as a global default profile. The default values for the different parameters in the PM for link delay is given as follows:

probe measurement mode: The default measurement mode for probe is two-way delay measurement. If you are configuring one-way delay measurement, hardware clocks must be synchronized between the local-end and remote-end routers using precision time protocol (PTP). See Measurement Modes for more information.
protocol: Interface delay measurement using RFC 5357 with IP/UDP encap (TWAMP-Light).
burst interval: Interval for sending probe packet. The default value is 3000 milliseconds and the range is from 30 to 15000 milliseconds.
computation interval: Interval for metric computation. Default is 30 seconds; range is 1 to 3600 seconds.
periodic advertisement: Periodic advertisement is enabled by default.
periodic-advertisement interval: The default value is 120 seconds and the interval range is from 30 to 3600 seconds.
periodic-advertisement threshold: Checks the minimum-delay metric change for threshold crossing for periodic advertisement. The default value is 10 percent and the range is from 0 to 100 percent.
periodic-advertisement minimum change: The default value is 1000 microseconds (usec) and the range is from 0 to 100000 microseconds.
accelerated advertisement: Accelerated advertisement is disabled by default.
accelerated-advertisement threshold: Checks the minimum-delay metric change for threshold crossing for accelerated advertisement. The default value is 20 percent and the range is from 0 to 100 percent.
accelerated-advertisement minimum change: The default value is 500 microseconds and the range is from 0 to 100000 microseconds.

RP/0/0/CPU0:router(config)# performance-measurement delay-profile interfaces 
RP/0/0/CPU0:router(config-pm-dm-intf)# probe
RP/0/0/CPU0:router(config-pm-dm-intf-probe)# measurement-mode one-way
RP/0/0/CPU0:router(config-pm-dm-intf-probe)# burst-interval 60
RP/0/0/CPU0:router(config-pm-dm-intf-probe)# computation-interval 60
RP/0/0/CPU0:router(config-pm-dm-intf-probe)# exit

RP/0/0/CPU0:router(config-pm-dm-intf)# advertisement periodic
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# interval 120
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# threshold 20
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# minimum-change 1000
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# exit

RP/0/0/CPU0:router(config-pm-dm-intf)# advertisement accelerated
RP/0/0/CPU0:router(config-pm-dm-intf-adv-acc)# threshold 30
RP/0/0/CPU0:router(config-pm-dm-intf-adv-acc)# minimum-change 1000
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# exit

Configure the UDP Destination Port

Configuring the UDP port for TWAMP-Light protocol is optional. By default, PM uses port 862 as the TWAMP-reserved UDP destination port for delay.

The UDP port is configured for each PM measurement probe type (delay, loss, protocol, authentication mode, etc.) on querier and responder nodes. If you configure a different UDP port, the UDP port for each PM measurement probe type must match on the querier and the responder nodes.

Note

The same UDP destination port is used for delay measurement for links and SR Policy.

This example shows how to configure the UDP destination port for delay.

Router(config)# performance-measurement

Router(config-perf-meas)# protocol twamp-light

Router(config-pm-protocol)# measurement delay unauthenticated 
Router(config-pm-proto-mode)# querier-dst-port 12000

Enable PM for Link Delay Over an Interface

This example shows how to enable PM for link delay over an interface.

RP/0/0/CPU0:router(config)# performance-measurement 
RP/0/0/CPU0:router(config-perf-meas)# interface TenGigE0/0/0/0
RP/0/0/CPU0:router(config-pm-intf)# delay-measurement 
RP/0/0/CPU0:router(config-pm-intf-dm)# exit

The source and destination IP addresses used in the OAM packet are determined by the IP address present on the interface where the delay-measurement operation is enabled.

the following rules apply to determine the source and destination IP addresses used in the OAM packet:

If an IPv4 address is configured under the interface, then:
- OAM packet source IP address = Interface's IPv4 address
- OAM packet destination IP address = 127.0.0.0
Else, if an IPv6 global address is configured under the interface, then:
- OAM packet source IP address = Interface's IPv6 global address
- OAM packet destination IP address = 0::ff:127.0.0.0

This example shows how to enable PM for link delay over an interface with IPv4 address configured:


interface TenGigE0/0/0/0
 ipv4 address 10.10.10.1 255.255.255.0

performance-measurement
 interface TenGigE0/0/0/0
  delay-measurement

This example shows how to enable PM for link delay over an interface IPv6 address configured:


interface TenGigE0/0/0/0
 ipv6 address 10:10:10::1/64

performance-measurement
 interface TenGigE0/0/0/0
  delay-measurement

Verification

RP/0/0/CPU0:router# show performance-measurement profile interface
Thu Dec 12 14:13:16.029 PST

-------------------------------------------------------------------------------
0/0/CPU0
-------------------------------------------------------------------------------
Interface Delay-Measurement:
  Profile configuration:
    Measurement Type                            : Two-Way
    Probe computation interval                  : 30 (effective: 30) seconds
    Type of services                            : Traffic Class: 6, DSCP: 48
    Burst interval                              : 3000 (effective: 3000) mSec
    Burst count                                 : 10 packets
    Encap mode                                  : UDP
    Payload Type                                : TWAMP-light
    Destination sweeping mode                   : Disabled
    Periodic advertisement                      : Enabled
      Interval                                  : 120 (effective: 120) sec
      Threshold                                 : 10%
      Minimum-Change                            : 500 uSec
    Advertisement accelerated                   : Disabled
    Threshold crossing check                    : Minimum-delay

RP/0/0/CPU0:router# show performance-measurement summary detail location 0/2/CPU0

Thu Dec 12 14:09:59.162 PST

-------------------------------------------------------------------------------
0/2/CPU0
-------------------------------------------------------------------------------
Total interfaces                                : 1
Total SR Policies                               : 0
Total RSVP-TE tunnels                           : 0
Total Maximum PPS                               : 2000 pkts/sec
Total Interfaces PPS                            : 0 pkts/sec
Maximum Allowed Multi-hop PPS                   : 2000 pkts/sec
Multi Hop Requested PPS                         : 0 pkts/sec (0% of max allowed)
Dampened Multi Hop Requested PPS                : 0% of max allowed
Inuse Burst Interval Adjustment Factor          : 100% of configuration


Interface Delay-Measurement:
  Total active sessions                         : 1
  Counters:
    Packets:
      Total sent                                : 26
      Total received                            : 26
    Errors:
        TX:
          Reason interface down                 : 0
          Reason no MPLS caps                   : 0
          Reason no IP address                  : 0
          Reason other                          : 0
        RX:
          Reason negative delay                 : 0
          Reason delay threshold exceeded       : 0
          Reason missing TX timestamp           : 0
          Reason missing RX timestamp           : 0
          Reason probe full                     : 0
          Reason probe not started              : 0
          Reason control code error             : 0
          Reason control code notif             : 0
    Probes:
      Total started                             : 3
      Total completed                           : 2
      Total incomplete                          : 0
      Total advertisements                      : 0

SR Policy Delay-Measurement:
  Total active sessions                         : 0
  Counters:
    Packets:
      Total sent                                : 0
      Total received                            : 0
    Errors:
        TX:
          Reason interface down                 : 0
          Reason no MPLS caps                   : 0
          Reason no IP address                  : 0
          Reason other                          : 0
        RX:
          Reason negative delay                 : 0
          Reason delay threshold exceeded       : 0
          Reason missing TX timestamp           : 0
          Reason missing RX timestamp           : 0
          Reason probe full                     : 0
          Reason probe not started              : 0
          Reason control code error             : 0
          Reason control code notif             : 0
    Probes:
      Total started                             : 0
      Total completed                           : 0
      Total incomplete                          : 0
      Total advertisements                      : 0

RSVP-TE Delay-Measurement:
  Total active sessions                         : 0
  Counters:
    Packets:
      Total sent                                : 0
      Total received                            : 0
    Errors:
        TX:
          Reason interface down                 : 0
          Reason no MPLS caps                   : 0
          Reason no IP address                  : 0
          Reason other                          : 0
        RX:
          Reason negative delay                 : 0
          Reason delay threshold exceeded       : 0
          Reason missing TX timestamp           : 0
          Reason missing RX timestamp           : 0
          Reason probe full                     : 0
          Reason probe not started              : 0
          Reason control code error             : 0
          Reason control code notif             : 0
    Probes:
      Total started                             : 0
      Total completed                           : 0
      Total incomplete                          : 0
      Total advertisements                      : 0

Global Delay Counters:
  Total packets sent                            : 26
  Total query packets received                  : 26
  Total invalid session id                      : 0
  Total missing session                         : 0

RP/0/0/CPU0:router# show performance-measurement interfaces detail
Thu Dec 12 14:16:09.692 PST

-------------------------------------------------------------------------------
0/0/CPU0
-------------------------------------------------------------------------------

-------------------------------------------------------------------------------
0/2/CPU0
-------------------------------------------------------------------------------

Interface Name: GigabitEthernet0/2/0/0 (ifh: 0x1004060)
  Delay-Measurement                 : Enabled
  Loss-Measurement                  : Disabled
  Configured IPv4 Address           : 10.10.10.2
  Configured IPv6 Address           : 10:10:10::2
  Link Local IPv6 Address           : fe80::3a:6fff:fec9:cd6b
  Configured Next-hop Address       : Unknown
  Local MAC Address                 : 023a.6fc9.cd6b
  Next-hop MAC Address              : 0291.e460.6707
  Primary VLAN Tag                  : None
  Secondary VLAN Tag                : None
  State                             : Up

  Delay Measurement session:
    Session ID          : 1

    Last advertisement:
      Advertised at: Dec 12 2019 14:10:43.138 (326.782 seconds ago)
      Advertised reason: First advertisement
      Advertised delays (uSec): avg: 839, min: 587, max: 8209, variance: 297

    Next advertisement:
      Threshold check scheduled in 1 more probe (roughly every 120 seconds)
      Aggregated delays (uSec): avg: 751, min: 589, max: 905, variance: 112
      Rolling average (uSec): 756

    Current Probe:
      Started at Dec 12 2019 14:15:43.154 (26.766 seconds ago)
      Packets Sent: 9, received: 9
      Measured delays (uSec): avg: 795, min: 631, max: 1199, variance: 164
      Next probe scheduled at Dec 12 2019 14:16:13.132 (in 3.212 seconds)
      Next burst packet will be sent in 0.212 seconds
      Burst packet sent every 3.0 seconds 
      Probe samples:
        Packet Rx Timestamp       Measured Delay (nsec)
        Dec 12 2019 14:15:43.156          689223
        Dec 12 2019 14:15:46.156          876561
        Dec 12 2019 14:15:49.156          913548
        Dec 12 2019 14:15:52.157         1199620
        Dec 12 2019 14:15:55.156          794008
        Dec 12 2019 14:15:58.156          631437
        Dec 12 2019 14:16:01.157          656440
        Dec 12 2019 14:16:04.157          658267
        Dec 12 2019 14:16:07.157          736880

You can also use the following commands for verifying the PM for link delay on the local-end router.


Command	Description
show performance-measurement history probe interfaces [`interface`]	Displays the PM link-delay probe history for interfaces.
show performance-measurement history aggregated interfaces [`interface`]	Displays the PM link-delay aggregated history for interfaces.
show performance-measurement history advertisement interfaces [`interface`]	Displays the PM link-delay advertisement history for interfaces.
show performance-measurement counters [interface `interface`] [location `location-name`]	Displays the PM link-delay session counters.

You can also use the following commands for verifying the PM for link-delay configuration on the remote-end router.


Command	Description
show performance-measurement responder summary [location `location-name`]	Displays the PM for link-delay summary on the remote-end router (responder).
show performance-measurement responder interfaces [`interface`]	Displays PM for link-delay for interfaces on the remote-end router.
show performance-measurement responder counters [interface `interface`] [location `location-name`]	Displays the PM link-delay session counters on the remote-end router.

Configure a Static Delay Value on an Interface

You can configure an interface to advertise a static delay value, instead of the measured delay value. When you configure a static delay value, the advertisement is triggered immediately. The average, minimum, and maximum advertised values will use the static delay value, with a variance of 0.

Scheduled probes will continue, and measured delay metrics will be aggregated and stored in history buffer. However, advertisement threshold checks are suppressed so that there are no advertisements of the actual measured delay values. If the configured static delay value is removed, the next scheduled advertisement threshold check will update the advertised measured delay values.

The static delay value can be configured from 1 to 16777215 microseconds (16.7 seconds).

This example shows how to configure a static delay of 1000 microseconds:

RP/0/0/CPU0:router(config)# performance-measurement 
RP/0/0/CPU0:router(config-perf-meas)# interface TenGigE0/0/0/0
RP/0/0/CPU0:router(config-pm-intf)# delay-measurement 
RP/0/0/CPU0:router(config-pm-intf-dm)# advertise-delay 1000

Running Configuration


performance-measurement
 interface GigabitEthernet0/0/0/0
  delay-measurement
   advertise-delay 1000
  !
 !
!

Verification

RP/0/RSP0/CPU0:ios# show performance-measurement interfaces detail

--------------------------------------------------------------------------------
0/0/CPU0
--------------------------------------------------------------------------------

Interface Name: GigabitEthernet0/0/0/0 (ifh: 0x0)
  Delay-Measurement                 : Enabled

. . .

    Last advertisement:
      Advertised at: Nov 29 2021 21:53:00.656 (7.940 seconds ago)
      Advertised reason: Advertise delay config
      Advertised delays (uSec): avg: 1000, min: 1000, max: 1000, variance: 0

. . .

SR Performance Measurement Named Profiles

You can create a named performance measurement profile for delay or liveness.

Delay Profile

This example shows how to create a named SR performance measurement delay profile.

Router(config)# performance-measurement delay-profile sr-policy profile2
Router(config-pm-dm-srpolicy)# probe
Router(config-pm-dm-srpolicy-probe)# burst-interval 60
Router(config-pm-dm-srpolicy-probe)# computation-interval 60
Router(config-pm-dm-srpolicy-probe)# protocol twamp-light
Router(config-pm-dm-srpolicy-probe)# tos dscp 63

Router(config-pm-dm-srpolicy)# advertisement
Router(config-pm-dm-srpolicy-adv)# periodic
Router(config-pm-dm-srpolicy-adv-per)# interval 60
Router(config-pm-dm-srpolicy-adv-per)# minimum-change 1000
Router(config-pm-dm-srpolicy-adv-per)# threshold 20
Router(config-pm-dm-srpolicy-adv-per)# commit

Apply the delay profile for an SR Policy.

Router(config)# segment-routing traffic-eng
Router(config-sr-te)# policy TEST
Router(config-sr-te-policy)# color 4 end-point ipv4 10.10.10.10
Router(config-sr-te-policy)# performance-measurement
Router(config-sr-te-policy-perf-meas)# delay-measurement delay-profile name profile2

Router(config-sr-te-policy)# candidate-paths 
Router(config-sr-te-policy-path)# preference 100
Router(config-sr-te-policy-path-pref)# explicit segment-list LIST1
Router(config-sr-te-pp-info)# weight 2

Router(config-sr-te-policy-path-pref)# explicit segment-list LIST2
Router(config-sr-te-pp-info)# weight 3

Running Configuration

Router# show run segment-routing traffic-eng policy TEST

segment-routing
 traffic-eng
  policy TEST
   color 4 end-point ipv4 10.10.10.10
   candidate-paths
    preference 100
     explicit segment-list LIST1
      weight 2
     !
     explicit segment-list LIST2
      weight 3
     !
    !
   !
   performance-measurement
    delay-measurement
     delay-profile name profile2

Verification

Router# show performance-measurement profile named-profile delay sr-policy name profile2

----------------------------
0/RSP0/CPU0
----------------------------
SR Policy Delay Measurement Profile Name: profile2
  Profile configuration:
    Measurement mode                            : One-way
    Protocol type                               : TWAMP-light
    Encap mode                                  : UDP
    Type of service:
      PM-MPLS traffic class                     : 6
      TWAMP-light DSCP                          : 63
    Probe computation interval                  : 60 (effective: 60) seconds
    Burst interval                              : 60 (effective: 60) mSec
    Packets per computation interval            : 1000
    Periodic advertisement                      : Enabled
      Interval                                  : 60 (effective: 60) sec
      Threshold                                 : 20%
      Minimum-change                            : 1000 uSec
    Advertisement accelerated                   : Disabled
    Advertisement logging:
      Delay exceeded                            : Disabled (default)
    Threshold crossing check                    : Maximum-delay
    Router alert                                : Disabled (default)
    Destination sweeping mode                   : Disabled
    Liveness detection parameters:
      Multiplier                                : 3
      Logging state change                      : Disabled

On-Demand SR Policy

Router(config-sr-te)# on-demand color 20
Router(config-sr-te-color)# performance-measurement delay-measurement
Router(config-sr-te-color-delay-meas)# delay-profile name profile2 
Router(config-sr-te-color-delay-meas)# commit

Running Configuration

Router# show run segment-routing traffic-eng on-demand color 20

segment-routing
 traffic-eng
  on-demand color 20
   performance-measurement
    delay-measurement
     delay-profile name profile2

Liveness Profile

This example shows how to create a named SR performance measurement liveness profile.

Router(config)# performance-measurement liveness-profile sr-policy name profile3 
Router(config-pm-ld-srpolicy)# probe 
Router(config-pm-ld-srpolicy-probe)# burst-interval 60
Router(config-pm-ld-srpolicy-probe)# measurement-mode loopback
Router(config-pm-ld-srpolicy-probe)# tos dscp 10
Router(config-pm-ld-srpolicy-probe)# liveness-detection
Router(config-pm-ld-srpolicy-probe)# multiplier 5
Router(config-pm-ld-srpolicy-probe)# commit

Apply the Liveness Profile for the SR Policy

This example shows how to enable PM for SR policy liveness for a specific policy.

For the same policy, you cannot enable delay-measurement (delay-profile) and liveness-detection (liveness-profile) at the same time. For example, if delay measurement is enabled, use the no delay-measurement command to disable it, and then enable the following command for enabling liveness detection.

Router(config)# segment-routing traffic-eng
Router(config-sr-te)# policy TRST2
Router(config-sr-te-policy)# color 40 end-point ipv4 20.20.20.20
Router(config-sr-te-policy)# candidate-paths 
Router(config-sr-te-policy-path)# preference 50
Router(config-sr-te-policy-path-pref)# explicit segment-list LIST3
Router(config-sr-te-pp-info)# weight 2

Router(config-sr-te-policy-path-pref)# explicit segment-list LIST4
Router(config-sr-te-pp-info)# weight 3

Router(config-sr-te-policy)# performance-measurement
Router(config-sr-te-policy-perf-meas)# liveness-detection liveness-profile name profile3

Running Configuration

Router# show run segment-routing traffic-eng policy TRST2

segment-routing
 traffic-eng
  policy TRST2
   color 40 end-point ipv4 20.20.20.20
   candidate-paths
    preference 50
     explicit segment-list LIST3
      weight 2
     !
     explicit segment-list LIST4
      weight 3
     !
    !
   !
   performance-measurement
    liveness-detection
     liveness-profile name profile3
    !

Verification

Router# show performance-measurement profile named-profile delay

-----------
0/RSP0/CPU0
-----------

SR Policy Liveness Detection Profile Name: profile1
  Profile configuration:
    Measurement mode                            : Loopback
    Protocol type                               : TWAMP-light
    Type of service:
      TWAMP-light DSCP                          : 10
    Burst interval                              : 60 (effective: 60) mSec
    Destination sweeping mode                   : Disabled
    Liveness detection parameters:
      Multiplier                                : 3
      Logging state change                      : Disabled

SR Policy Liveness Detection Profile Name: profile3
  Profile configuration:
    Measurement mode                            : Loopback
    Protocol type                               : TWAMP-light
    Type of service:
      TWAMP-light DSCP                          : 10
    Burst interval                              : 60 (effective: 60) mSec
    Destination sweeping mode                   : Disabled
    Liveness detection parameters:
      Multiplier                                : 3
      Logging state change                      : Disabled

On-Demand SR Policy

For the same policy, you cannot enable delay-measurement (delay-profile) and liveness-detection (liveness-profile) at the same time. For example, to disable delay measurement, use the no delay-measurement command, and then enable the following command for enabling liveness detection.

Router(config-sr-te)# on-demand color 30
Router(config-sr-te-color)# performance-measurement 
Router(config-sr-te-color-pm)# liveness-detection liveness-profile name profile1
Router(config-sr-te-color-delay-meas)# commit

Running Configuration

Router# show run segment-routing traffic-eng on-demand color 30

segment-routing
 traffic-eng
  on-demand color 30
   performance-measurement
    liveness-detection
     liveness-profile name profile1
    !

Verification

Router# show performance-measurement profile named-profile liveness sr-policy name profile1

--------------------
0/RSP0/CPU0
--------------------
SR Policy Liveness Detection Profile Name: profile1
  Profile configuration:
    Measurement mode                            : Loopback
    Protocol type                               : TWAMP-light
    Type of service:
      TWAMP-light DSCP                          : 10
    Burst interval                              : 60 (effective: 60) mSec
    Destination sweeping mode                   : Disabled
    Liveness detection parameters:
      Multiplier                                : 3
      Logging state change                      : Disabled

Segment Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 7.2.x

Bias-Free Language

Book Title

Segment Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 7.2.x

Chapter Title