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CDP between SG300-24 and WS-X2948 WS-X2948G-GE-TX

Hello everybody,

I connected a SMB SG300 series switch to an 2948G (CatOS). On the first view CDP seemed not to work at all between the two. After configuring both switches to CDP version 1, the SG300 recognizes the 2948G in "sh cdp neigh", but not vice versa:


on 2948G:

core-switch> (enable) sh cdp     
CDP               : enabled
Message Interval  : 60
Hold Time         : 180
Version           : V1
Device Id Format  : Other
core-switch> (enable) sh cdp neighbors 
No entry found.




on SG300:


wg-sw-3og#show cdp
Global CDP information:
        CDP is globally enabled
        CDP log duplex mismatch is globally enabled
        CDP log voice VLAN mismatch is globally enabled
        CDP log native VLAN mismatch is globally enabled
        Mandatory TLVs validation is disabled
        Sending CDPv2 advertisements is disabled
        Sending Appliance TLV is enabled
        Device ID format is Host Name
        Sending CDP packets every 60 seconds
        Sending a holdtime value of 180 seconds
        CDP packets handling mode is bridging
wg-sw-3og#show cdp neighbors 
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - VoIP Phone
                  M - Remotely-Managed Device, C - CAST Phone Port,
                  W - Two-Port MAC Relay

    Device ID       Local      Adv  Time To Capability   Platform     Port ID   
                    Interface  Ver. Live                                        
------------------ ----------- ---- ------- ---------- ------------ ----------- 
JAE0919BUZU(core-s    gi28      1     146      T S     WS-C2948G-GE    2/48     



I checked a similiar setup of an SG300 against an Catalyst3550 in the lab. this worked flawlessly.




Any suggestions?


thx, Carsten


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