[afnog] Difference between mac address on interface and mac address in the arp table

[Christian M]

the 4500 is only learning 0024.9798.3e25

Subject: Re: [afnog] Difference between mac address on interface and mac address in the arp table
To: chrismuhirwa at hotmail.com; afnog at afnog.org
From: mark.tinka at seacom.mu
Date: Wed, 18 Mar 2015 09:00:23 +0200


  
    
  
  
    

    

    On 17/Mar/15 19:18, Christian M wrote:

    
    
      
      
      Hello.
        We are trying to set up an Ethernet over SDH link across
          multiple ADMs  (from different vendors) linking on one end a
          cisco 6500 and on another a cisco 4500. We have been
          successful in getting the MAC address learned across the end
          points of the link. 
        

        
        However on the c4500, the mac address learned is the one on
          the physical interface of the c6500 (the same as the one on
          show interface) which is different from the one on the arp
          table. I have put the show command below on the c6500 which is
          on my end.
        

        
        
          GigabitEthernet4/14
              is up, line protocol is up (connected)
            Hardware
              is C6k 1000Mb 802.3, address is 0024.9798.3e25
              (bia 0024.9798.3e25)
        
        

          
        

          
        
          Protocol
               Address          Age (min)  Hardware Addr   Type  
              Interface
          Internet
               10.10.10.2              -   0024.97d2.bf00
               ARPA   GigabitEthernet4/14
          Internet
               10.10.10.1              0   Incomplete      ARPA
        
        

        
        
          interface
              GigabitEthernet4/14
           ip address
              10.10.10.2 255.255.255.252
        
        

        
        

        
        I need help figuring out why the c4500 on the other end of
          the EoS link is learning 0024.97d2.bf00 instead
          of 0024.97d2.bf00 (which is in arp table) in how I can make
          this work.
      
    
    

    Is the 4500 learning 0024.9798.3e25 or 0024.97d2.bf00?

    

    Mark.
 		 	   		  
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