Device-tracking problem with cisco ios

[dijix1990]

Hi, after enabling ip device-tracking for ios devices:

• 2960 Plus
• 2960
• 2960X
• 2960S

I found that my cisco phones can't resolve arp for other cisco phones:

My config was:

sh ip device tracking all
IP Device Tracking = Enabled
IP Device Tracking Probe Count = 3
IP Device Tracking Probe Interval = 60
IP Device Tracking Probe Delay Interval = 20

and I could resolve my problem only through disable ip device-tracking globally. 

Maybe somebody bumped into the same problem?

[MHM Cisco World]

https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/8021x/116529-problemsolution-product-00.html

check this you need to select source of device tracking 

MHM

[dijix1990]

I checked, it's only for windows

[MHM Cisco World]

what is Windows ?

ip device tracking probe use-svi <<- try this

 MHM

[dijix1990]

Troubleshoot Duplicate IP Address 0.0.0.0 Error Messages - it's article how fix problem with arp checking from windows when IPDT enable

ip device tracking probe use-svi <<- try this 

this command only works when we have SVI for network devices

• ip phones inside vlan 10 and network 10.10.0.0/24
• windows hosts inside vlan 5 and network 10.20.0.0/24

if we want to use we need to configure for every switches SVI vlan5 with ip from 10.20.0.0/24 and vlan10 from 10.10.0.0/24

ip device tracking probe use-svi

tried to use this one, it didn't help for my cisco phones... when IPDT enable global ip phones lost arp

ip device tracking probe auto-source fallback <host-ip> <mask> [override]

[MHM Cisco World]

Friend the DHCP server use ARP to detect if IP is use or not 
also what you face is ARP issue where the phone

both issue is same for me 
there are three workaround try which one work with you 

MHM

[dijix1990]

My phones work without dhcp

[MHM Cisco World]

Did you read link I share?

What you get from it?

Why dhcp is failed?

MHM

[dijix1990]

Of course I read it when I bumped into problem with windows ip duplication because of ipdt. If you read my first message I changed default delay to 20 and interval to 60 as mentioned in the article. It resolved problem with windows hosts, but ipdt started to affect to cisco 7821 (One-way audibility) if I connect to problem phone via ssh and check arp to problem phone. I can see there's not arp, after I disabled ipdt arp appears.

I don't have dhcp for my phones, only static configuration

[MHM Cisco World]

What I meaning' that dhcp use arp and your issue is about arp' link I share is how to solve arp with ip tracking.

Anyway I see below you use one for workaround and it work.

Glad it solve issue for some SW.

Thanks and have a nice day

MHM

[dijix1990]

Vlan Just vlan, I don't have dhcp snooping. I think it's bug, for my 2960x and 2960 plus

I did this config (it's resolving problem for pxe devices too, because it needs extra interval) 

ip device tracking probe auto-source fallback 0.0.0.254 255.255.255.0 overrid

ip device tracking probe interval 45

ip device tracking probe count 2

But it started work normally only after reloading. 

For older 2960 I had to disable ipdt, because it doesn't have fallback option and command use svi doesn't work without l3 svi (you need have extra svi for every switches which have windows or phones)