[c-nsp] Strange bug - me36500x - ip address on gig interface

Mike mike-cisconsplist at tiedyenetworks.com
Tue Jul 12 02:12:35 EDT 2016


     I have a damm weird one.

     I have an me3600x, and gi0/7 is a fiber port. I have configured it 

     interface GigabitEthernet0/7
     no switchport
     ip address
     speed nonegotiate

     Another device (an asr920) on the other end of that fiber with the 
address, cannot ping it. However, the asr920 does see cdp 
announcements from the me3600x. The me3600x does not see cdp itself, 

     If I put static mac address entries in both devices, then I can 
ping and play and do everything. But remove the static entires and 
nothing works again, just one way cdp.

     Interestingly enough, if I instead create a vlan interface and put 
this interface into that vlan, it works:

interface GigabitEthernet0/7
  switchport access vlan 500
  speed nonegotiate

interface Vlan500
  ip address

     Why does it have to exist in an SVI in order to work? And even 
worse - I have tengig interfaces on this box which I can apply ip 
addresses to directly as above and they work as expected.

What gives?


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