a core switch cannot see cisco 2811 when i do show cdp neighbors

[Fachroky Wiratama]

Hi there.

I'm having a strange issue here. I just installed a cisco 2811 and connected it to the core switch WS-C6509-E.

CDP  is enabled on both devices. When i do show cdp neighbor on my  WS-C6509-Ei cannot see the cisco 2811 in my neighbor table.

But on the cisco 2811, when i do show cdp neighbor i can see the WS-C6509-E.

Note everything works fine its just that i'm worried as to why my WS-C6509-E cant see the cisco 2811 as its neighbor.

the cisco 2811 is connected with access vlan on my core switch.

I would like to thank you in anticipation of your urgernt response

Regards,

Rocky

[Amos Kafwembe]

tricky one hey....try a "no cdp run" then "cdp run" just to disable and enable cdp on both devices. try restarting the devices too....maybe that might help.

[Fachroky Wiratama]

there are so many devices that connected on this core so i can't restart the devices i've tried to enable and disable cdp on both device but it still doesn't work. is there any solution that i can do to solve this problem ?

[Neeraj Arora]

Rocky,

On 6509 switch, you can issue the command "sh cdp interface GigabitEthernet X/XX"

It will show you something like below:

GigabitEthernet X/XX is up, line protocol is up

  Encapsulation ARPA

  Sending CDP packets every 60 seconds

  Holdtime is 180 seconds

This might help

[InayathUlla Sharieff]

Hi Frachorky,

Could you kindly try this on both the switches;

clear the cdp table and counters then try the following:

6500 # config t

6500(config)# cdp enable

6500(config)#int g1/0---thinking that this is connected to 2950

6500(config-if)# cdp enable.

Same goes to 2900.

And update us the result.

HTH

Regards

Inayath