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Show CDP Neighbors in L3 Switch

Posted on 2014-10-23
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Last Modified: 2014-10-23
I have the topology shown below.
When I run Show CDP neighbors on each Switch, I can see just one switch as neigh instead of 2 Switches. I am not sure why this is happening.
Any help will be very much appreciated

Thanks
Switch01#sh cdp neighbors 
Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
Switch02         Eth 0/1           178              R S   Linux Uni Eth 0/1
Switch02         Eth 0/0           144              R S   Linux Uni Eth 0/0
Switch01#

Switch02#show cdp neighbors 
 Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
Switch01         Eth 0/1           170              R S   Linux Uni Eth 0/1
Switch01         Eth 0/0           151              R S   Linux Uni Eth 0/0
Switch02#

Switch03#sh cdp neighbors 
 Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
Switch04         Eth 0/0           162              R S   Linux Uni Eth 0/0
Switch04         Eth 0/1           150              R S   Linux Uni Eth 0/1
Switch03#

Switch04#sh cdp neighbors 
 Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
Switch03         Eth 0/0           138              R S   Linux Uni Eth 0/0
Switch03         Eth 0/1           146              R S   Linux Uni Eth 0/1
Switch04#

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cdp
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Question by:jskfan
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Accepted Solution

by:
Johneil1 earned 500 total points
ID: 40400566
is CDP running globally or per interface?
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Author Comment

by:jskfan
ID: 40400572
mmm....
I have not enabled it manually at all...but I believe it is enabled by default:
Switch01#sh cdp
Global CDP information:
        Sending CDP packets every 60 seconds
        Sending a holdtime value of 180 seconds
        Sending CDPv2 advertisements is  enabled
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Author Comment

by:jskfan
ID: 40400598
Mistake in the topology.....now it is working, though it showing something weird:
SW1#sh cdp neighbors 
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone, 
                  D - Remote, C - CVTA, M - Two-port Mac Relay 

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
SW4              Eth 0/3           159              R S   Linux Uni Eth 0/3
SW4              Eth 0/2           139              R S   Linux Uni Eth 0/2
Switch           Eth 0/3           49               R S   Linux Uni Eth 0/3
Switch           Eth 0/2           41               R S   Linux Uni Eth 0/2
Switch           Eth 0/1           33               R S   Linux Uni Eth 0/1
Switch           Eth 0/0           30               R S   Linux Uni Eth 0/0
SW2              Eth 0/0           138              R S   Linux Uni Eth 0/0
SW2              Eth 0/1           137              R S   Linux Uni Eth 0/1
SW1#

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I wonder why this output is there:
Switch           Eth 0/3           49               R S   Linux Uni Eth 0/3
Switch           Eth 0/2           41               R S   Linux Uni Eth 0/2
Switch           Eth 0/1           33               R S   Linux Uni Eth 0/1
Switch           Eth 0/0           30               R S   Linux Uni Eth 0/0
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Author Comment

by:jskfan
ID: 40400628
the weird stuff went away by itself now...
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Author Closing Comment

by:jskfan
ID: 40400629
Thank you for jumping in to help !
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