topic Re: Serial port not showing up for packet tracer " show cdp neighbors " command in Routing and SD-WAN

Serial port not showing up for packet tracer " show cdp neighbors " command

TheFox — Wed, 29 May 2019 03:15:44 GMT

When entering the show cdp neighbors command on a 1941 router with a HWIC-2T module attached for serial ports - and a HWIC-4ESW module attached for fastethernet ports, the fastethernet ports will display. But, the serial ports will not. CDP is enabled on the serial ports, but they are still not showing up. I've been racking my brains and searching for the answer with no avail. What gives?

Re: Serial port not showing up for packet tracer " show cdp neighbors " command

luis_cordova — Wed, 29 May 2019 04:41:23 GMT

Hi @TheFox ,

Could you compress your exercise (Winzip) and attach it to review the settings?

Regards

Re: Serial port not showing up for packet tracer " show cdp neighbors " command

Georg Pauwen — Wed, 29 May 2019 08:26:07 GMT

Hello,

what cable are you using to connect the serial interfaces ? Make sure one end is DTE, and the other DC. I have attached a simple sample project with two 1941s configured back to back...

Re: Serial port not showing up for packet tracer " show cdp neighbors " command

TheFox — Thu, 30 May 2019 23:49:53 GMT

@luis_cordova wrote:
Hi @TheFox ,

Could you compress your exercise (Winzip) and attach it to review the settings?

Regards

Re: Serial port not showing up for packet tracer " show cdp neighbors " command

TheFox — Thu, 30 May 2019 23:55:55 GMT

@Georg Pauwen wrote:
Hello,

what cable are you using to connect the serial interfaces ? Make sure one end is DTE, and the other DC. I have attached a simple sample project with two 1941s configured back to back...

@Georg Pauwen
I used a cable with DTE and DC on either ends. Still no progress. I tried to use your sample project, but it says that it is a version that my packet tracer can not use. Perhaps you can download the attached exercise I am working on, and give me feedback?

Re: Serial port not showing up for packet tracer " show cdp neighbors " command

Georg Pauwen — Fri, 31 May 2019 07:13:21 GMT

Hello,

when I open your exercise file, all serial interfaces are 'shutdown'. You need to 'no shut' the interfaces and enable cdp (cdp run) globally on all routers...

Re: Serial port not showing up for packet tracer " show cdp neighbors " command

paul driver — Fri, 31 May 2019 08:28:26 GMT

Hello
Your serial interfaces are not even active - activate them and i am sure you will see them in the cdp table.

FYI - cdp wont work on multipoint links, P2P however it will.

Example:
int ser0/0/x
encapsulation hdlc
cdp run
no shut

Re: Serial port not showing up for packet tracer " show cdp neighbors " command

luis_cordova — Fri, 31 May 2019 15:32:25 GMT

Hi @TheFox ,

As already indicated, when you up the serial interfaces, the show cdp neighbors command shows all active interfaces.

I enclose the exercise for you to review.

Regards

Re: Serial port not showing up for packet tracer " show cdp neighbors " command

TheFox — Sat, 01 Jun 2019 04:50:38 GMT

Thanks @Georg Pauwen I can't believe I missed that! Interfaces are showing up now.