how to configure ipsla monitor in IOS XR Software, Version 4.2.3?

Question:

how to configure ipsla WS-C3750X-48P-L Price monitor in IOS XR Software, Version 4.2.3?

I don't see ipsla commands in IOS XR Software, Version 4.2.3. Any other ways to detect ethernet WAN links to trigger HSRP on ASR 9000 series routers? I don't even see track commands.

RP/0/RSP0/CPU0:grx-rtr2(config)#ip

iphc  ipv4  ipv6

RP/0/RSP0/CPU0:grx-rtr2(config)#t

tacacs-server  tacacs  taskgroup  tcam

tcp            telnet  template   tftp

Answer:

1. configure

2. track track-name

3. type line-protocol state

4. interface type interface-path-id

5. exit

6. (Optional) delay {up seconds|down seconds}

7. Use one of the following commands:

end

commit

Please see if the commands in this link are available to you on cli

http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.2/system_management/configuration/guide/b_sysman_cg42asr9k_chapter_01110.html

And then to use the track command in HSRP

hsrp [group-number] track type interface-path-id [priority-decrement]

I'm not sure if these are required.

As demonstrated here:

RP/0/0/CPU0:router(config)# router hsrp

RP/0/0/CPU0:router(config-hsrp)# interface TenGigE 0/2/0/1

RP/0/0/CPU0:router(config-hsrp-if)# hsrp track TenGigE 0/1/0/1

RP/0/0/CPU0:router(config-hsrp-if)# hsrp track TenGigE 0/3/0/1

RP/0/0/CPU0:router(config-hsrp-if)# hsrp preempt

RP/0/0/CPU0:router(config-hsrp-if)# hsrp ipv4 192.92.72.46 WS-C3750X-24S-S  

http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r3.9/addr_serv/command/reference/irasr9khsrp.html#wp999728