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Cisco CDP filtering
Posted: Wed Oct 29, 2014 7:22 am
by Akama
Hello there!
The question is - is there any way to filter Cisco CDP protocol packets at the hub? Thanks a lot.
Re: Cisco CDP filtering
Posted: Wed Oct 29, 2014 11:26 pm
by dajhorn
Try this:
1. Open the virtual hub.
2. Click the Manage Access Lists button.
3. Click the New (IPv4) button.
4a. Choose"Discard".
4b. Disable "Applies to any Destination Address".
4c. Set the destination "MAC Address" field to 01-00-0c-cc-cc-cc.
This ACL rule should block CDP broadcast traffic.
Re: Cisco CDP filtering
Posted: Thu Oct 30, 2014 7:24 am
by Akama
Thank you greatly, but in my case this rule blocked all traffic. It seems I cannot do this through IP access list, because CDP is non-IP, but Layer-2 protocol
Re: Cisco CDP filtering
Posted: Thu Oct 30, 2014 2:48 pm
by dajhorn
> but in my case this rule blocked all traffic.
The default rule passes traffic, so that means the new rule was incorrectly created.
> It seems I cannot do this through IP access list, because CDP is non-IP, but Layer-2 protocol
As an alternative, try the "FilterNonIp" toggle in the Virtual Hub Extended Options list.