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HSRP interface tracking on IOS XR

For many years I have configured HSRP on my IOS based devices with tracking configured for a Loopback without an IP so that during maintenance windows one simply needs to down the loopback to fail HSRP to the peer. However, recently when configuring the same setup on an ASR9K, I noticed that while the loopback shows up/up, HSRP sees it as down (config/output below). The only way to get HSRP to see the loopback as up is by configuring an IP on the loopback.

Does anyone know if this is intentional/expected behavior? Again, in IOS and NX-OS you do not need an IP on the loopback for HSRP to see it as up and track accordingly.

Thanks!

RP/0/RSP0/CPU0:ASR9K#sh int lo192

Tue Jun 12 22:18:47.134 MST

Loopback192 is up, line protocol is up

  Interface state transitions: 1

  Hardware is Loopback interface(s)

  Description: HSRP Tracking - DO NOT DOWN

  Internet address is Unknown

  MTU 1500 bytes, BW Unknown

     reliability Unknown, txload Unknown, rxload Unknown

  Encapsulation Loopback,  loopback not set,

  Last input Unknown, output Unknown

  Last clearing of "show interface" counters Unknown

  Datarate information unavailable.

  Interface counters unavailable.

RP/0/RSP0/CPU0:ASR9K#sh run router hsrp

Tue Jun 12 22:18:47.134 MST

router hsrp

interface TenGigE0/0/0/2

  hsrp 1 track Loopback192 200

  hsrp 1 preempt

  hsrp 1 ipv4 X.X.X.X

  hsrp 1 priority 255

RP/0/RSP0/CPU0:ASR9K#sh hsrp te0/0/0/2 det

Tue Jun 12 22:18:53.054 MST

TenGigE0/0/0/2 - Group 1

  Local state is Standby, priority 55, may preempt

  Hellotime 3 sec holdtime 10 sec

  Minimum delay 1 sec, reload delay 5 sec

  Hot standby IP address is X.X.X.X configured

  Active router is X.X.X.Y, priority 100 expires in 00:00:07

  Standby router is local

  Standby virtual mac address is 0000.0c07.ac01

  6 state changes, last state change 00:12:18

  State change history:

  Jun 12 22:05:59.547 MST  Init     -> Listen   Delay timer expired

  Jun 12 22:06:09.549 MST  Listen   -> Speak    Active timer expired

  Jun 12 22:06:19.551 MST  Speak    -> Standby  Standby timer expired

  Jun 12 22:06:19.551 MST  Standby  -> Active   Active timer expired

  Jun 12 22:06:24.195 MST  Active   -> Speak    Higher priority active received

  Jun 12 22:06:34.197 MST  Speak    -> Standby  Standby timer expired

  Last coup sent:       Never

  Last coup received:   Jun 12 22:06:24.209 MST

  Last resign sent:     Jun 12 22:06:24.195 MST

  Last resign received: Never

  Tracking interface states for 1 interface, 0 up:

    Down Loopback192 Priority decrement: 200

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1 REPLY
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HSRP interface tracking on IOS XR

Hi Tim,

Yes, its an expected behaviour of ios xr that only IP interfaces are tracked. A tracked interface is up if IP on that interface is up. Otherwise, the tracked interface is down.

plz Rate if it helped,

Soroush.

Hope it Helps!

Soroush.
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