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Strange route in ios xr

Dreggel001
Level 1
Level 1

Hi,

We have a problem with a "hanging" route in one of our asr9k. Even though the interface is numbered it is not considered connected.

Here is the interface config:

interface TenGigE0/1/0/3.950

ipv4 address 10.1.159.65 255.255.255.248

encapsulation dot1q 950

!

interface TenGigE0/1/0/3.951

ipv4 address 10.1.159.73 255.255.255.248

encapsulation dot1q 951

!

interface TenGigE0/1/0/3.952

ipv4 address 10.1.159.81 255.255.255.248

encapsulation dot1q 952

!

interface TenGigE0/1/0/3.953

ipv4 address 10.1.159.89 255.255.255.248

encapsulation dot1q 953

There is also a null-route for the larger /20 where these prefixes are included:

router static

address-family ipv4 unicast

  10.1.144.0/20 Null0

The interface in question is TenGigE0/1/0/3.950. When we try to ping both the local ip of that interface and other end this is the result:

RP/0/RSP0/CPU0:router#ping 10.1.159.66

Fri Jul  6 10:37:30.195 MEST

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.159.66, timeout is 2 seconds:

UUUUU

Success rate is 0 percent (0/5)

RP/0/RSP0/CPU0:router#ping 10.1.159.65

Fri Jul  6 10:37:34.690 MEST

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.159.65, timeout is 2 seconds:

UUUUU

Success rate is 0 percent (0/5)

and the route looks like this:

RP/0/RSP0/CPU0:router#sh ip route 10.1.159.66
Fri Jul  6 10:37:48.249 MEST

Routing entry for 10.1.144.0/20
  Known via "static", distance 1, metric 0 (connected)
  Installed Jun 29 06:30:36.776 for 1w0d
  Routing Descriptor Blocks
    directly connected, via Null0
      Route metric is 0
  No advertising protos.


RP/0/RSP0/CPU0:router#sh ip route 10.1.159.65
Fri Jul  6 10:38:01.176 MEST

Routing entry for 10.1.144.0/20
  Known via "static", distance 1, metric 0 (connected)
  Installed Jun 29 06:30:36.779 for 1w0d
  Routing Descriptor Blocks
    directly connected, via Null0
      Route metric is 0
  No advertising protos.

Anyone have any idea why this has happened, and how to solve it? All other interfaces are working as expected.

Regards

Johny

1 Reply 1

Alexei Kiritchenko
Cisco Employee
Cisco Employee

Hello Johny,

Which SW version do you run?

May you collect:

show int TenGigE0/1/0/3.950

show ipv4 int TenGigE0/1/0/3.950

show int TenGigE0/1/0/3.951

show ipv4 int TenGigE0/1/0/3.951

show arm conflict

Regards,

/A