topic Re: show cdp in Firewall and Security Management

show cdp

nflnetwork29 — Mon, 30 Mar 2020 18:44:12 GMT

hello i'm trying to see where my checkpoint is connected (which physical port)

the physical port is eth 2 on the checkpoint

is there a command similar to "show cdp" in checkpoint CLI ?

Re: show cdp

Timothy_Hall — Mon, 30 Mar 2020 19:36:25 GMT

Sort of. From the third edition of my book:

Determining the Layer 2 switching path is a little more difficult and may involve
tracing cables. If you are using Cisco switches in your network, from the firewall you
can sniff and decode Cisco Discovery Protocol (CDP) frames from the switch attached to
the firewall with this command:

tcpdump -vn -s 1500 -i (interface) 'ether[20:2] == 0x2000'

Figure 1-6: tcpdump Decode of CDP Traffic

From your testing workstation, you can do something similar in Wireshark. Start a
capture on your network interface and use the following filter:

eth.dst == 01:00:0c:cc:cc:cc

Figure 1-7: Wireshark Decode of CDP Traffic

The CDP traffic should tell you enough about the locally attached switch to identify
it. Keep in mind that there may be many other switches in the path between your testing
workstation and the firewall depending upon the architecture of your network; you need
to discover them all. If they are Cisco switches and you can obtain command-line access
to them, running the Cisco IOS command show cdp neighbors is helpful for
identifying adjacent switches.

Depending on the vendor (and version) of the networking devices used in your
environment, they may be using the IEEE 802.1AB Link Layer Discovery Protocol
(LLDP) instead of CDP. The Cisco command show lldp neighbors is helpful for
identifying adjacent switches; use this command to view and decode LLDP traffic:

tcpdump -vn -s 1500 -i (interface) ether proto 0x88cc

Re: show cdp

Vladimir — Mon, 30 Mar 2020 19:41:48 GMT

This looks like another great candidate for @HeikoAnkenbrand or @Danny to turn into oneliner 🙂

Re: show cdp

nflnetwork29 — Mon, 30 Mar 2020 19:44:05 GMT

really? that seems like its overly complicated lol

Re: show cdp

_Val_ — Tue, 31 Mar 2020 07:03:59 GMT

Cisco Discover Protocol is not supported with Check Point.

Re: show cdp

Maria_Pologova — Wed, 22 Apr 2020 22:04:02 GMT

There is self-written CDP deamon for Check Point. Works like a charm.

https://github.com/oribit/cdpd-cp

Re: show cdp

xsxso — Thu, 24 Mar 2022 16:10:35 GMT

What about LLDP?

Re: show cdp

Chris_Atkinson — Thu, 24 Mar 2022 23:14:09 GMT

Only in R81 and above per sk117676, note the limitations about VSX.