01-16-2025 02:28 AM
Hi, after enabling ip device-tracking for ios devices:
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?
01-16-2025 02:33 AM
check this you need to select source of device tracking
MHM
01-16-2025 02:36 AM
I checked, it's only for windows
01-16-2025 02:40 AM
what is Windows ?
ip device tracking probe use-svi <<- try this
MHM
01-16-2025 02:49 AM - edited 01-16-2025 02:51 AM
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
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]
01-16-2025 02:57 AM
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
01-16-2025 07:44 AM
My phones work without dhcp
01-16-2025 07:54 AM
Did you read link I share?
What you get from it?
Why dhcp is failed?
MHM
01-16-2025 03:46 PM
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
01-16-2025 04:16 PM
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
01-16-2025 03:54 PM - edited 01-16-2025 03:58 PM
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)
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