10-03-2013 01:37 AM - edited 03-07-2019 03:48 PM
Hi,
I have one router C3925 which uses HWIC-4ESW module card to connect to two Gigabit port on 2960 SWs. The Router can ping two SWs, but no neighbor when issue "show cdp" command. However, 2 SW can see the router in "show cdp neighbor" command.
The Router has IOS "c3900-universalk9-mz.SPA.151-4.M2.bin" installed on it.
All connected ports are trunk.
Thanks to any advices
10-03-2013 02:45 AM
Does "sh cdp interface" output of your 3900 router show the HWIC interfaces as CDP enable ?
Rasika
10-03-2013 02:49 AM
Can you please share the configuration of trunk ports at both end. Thanks
10-03-2013 04:42 AM
Hello, Can you check if 'no cdp enable' command applied on trunk interfaces of the router.
Regards,
Yaseen
10-03-2013 10:54 PM
Hi,
This is my configuration file
On Router
interface FastEthernet0/0/0
description " TO RP-Router-2 "
switchport mode trunk
no ip address
!
interface FastEthernet0/0/1
description " TO RP-Sw-1 "
switchport mode trunk
no ip address
!
interface FastEthernet0/0/2
description " TO RP-Sw-2 "
switchport mode trunk
no ip address
!
interface FastEthernet0/0/3
no ip address
!
On Switch
interface GigabitEthernet0/1
description " TO RP-Router-1 "
switchport mode trunk
switchport nonegotiate
!
interface GigabitEthernet0/2
description " TO RP-Router-2 "
switchport mode trunk
switchport nonegotiate
!
on my Router, CDP is enabled by default
RP-Router-1#show cdp interface
Embedded-Service-Engine0/0 is administratively down, line protocol is down
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
GigabitEthernet0/0 is administratively down, line protocol is down
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
GigabitEthernet0/1 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
GigabitEthernet0/2 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/0/0 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/0/1 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/0/2 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/0/3 is down, line protocol is down
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
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