Posted on July 31, 2019 8:09 pm
 |  Asked by Saskia
 |  448 views
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Hi,
I have a few Arista switches, which are connected to Cisco switches.
Since the Arista switches just plainly forward the CDP the overview on the Cisco switches is quite… bad.
Is there any way to block CDP from traversing the Arista switch?

Cheers,
Saskia

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Posted by Upasana Dangi
Answered on July 31, 2019 8:55 pm

Hi Saskia,

A MAC ACL can be used inbound to deny CDP packets to avoid flooding the same.

Eg:
mac access-list cdp-deny
10 deny any 01:00:0c:cc:cc:cc 00:00:00:00:00:00
20 permit any any

interface Ethernet1/1
mac access-group cdp-deny in
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Posted by Roberto Salazar
Answered on July 31, 2019 9:00 pm

Optionally you can disable the CDP on Cisco devices at the interface level connecting to the Arista switch using the "no cdp enable" command. This will stop the Cisco devices in sending CDP packets eliminating the need for the MAC ACL
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