Connectivity
Guys,
SW3(Fa0/3)----R3(Fa0/1) are directly connected. Why these devices are no showing up in the "sh cdp neighbor". What am i missing here?
Rack8R3#sh run int f0/1
Building configuration...
Current configuration : 115 bytes
interface FastEthernet0/1
ip address 132.8.33.3 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
end
Rack8R3#sh cdp int f0/1
FastEthernet0/1 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Rack8R3#sh cdp nei f0/1
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
Rack8R3#
Rack8SW3#sh cdp int f0/3
FastEthernet0/3 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Rack8SW3#sh int f0/3 status
Port Name Status Vlan Duplex Speed Type
Fa0/3 connected 33 a-full a-100 10/100BaseTX
Rack8SW3#sh run int f0/3
Building configuration...
Current configuration : 95 bytes
interface FastEthernet0/3
switchport access vlan 33
switchport mode dynamic desirable
end
Rack8SW3#sh cdp nei f0/3
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
Rack8SW3#
Comments
Can you ping between the devices? Has the VLAN been created? Did you try any debugging?
Hi,
Try "debug cdp events" and "debug cdp adjacency".
Good luck with your studies!
Hi,
Try "debug cdp events" and "debug cdp adjacency".
Good luck with your studies!
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Thanks Daniel. There was some VTP issue. Vlans was not propogating upto SW3. I just relied on the priviously saved config. I should have checked the preconfiguration before going further.
Regards,
Hi,
Basically your problem was that port was up on the switch, but was not forwarding traffic. Remember, as a general tshoot tool, always issue command "show spanning-tree interface fa0/0" and see if STP is in forwarding state for that interface and VLAN you need, otherwise interface is kinda disabled! In older IOS versions, the port led remained orange if STP was not in FW or VLAN the interface was acces on did not exist; nowadays i see this is no longer the case which is bad
(not that you would have direct access to devices in thye lab, but...)
Good luck with your studies!
Another reason you could see this behaviour would be through the use of Flex-links. The backup link would be up up but would have spanning-tree instances on the port.
This has caught me out on a number of occasions!
Thanks Critian, I keep this point in mind.