No mac address on mac-address-table, but arp is..

[typeonegative]

Any ideas? After clearing arp, it wents ok, but how to solve this without clearing manualy?

interface Vlan2
 ip address 10.101.1.1 255.255.255.0
 arp timeout 180
end

DSA#show mac address-table aging-time vlan 2
Global Aging Time:  300
Vlan    Aging Time
----    ----------
   2     300
DSA#sh arp | inc 10.101.1.205
Internet  10.101.1.205            3   0017.9a7a.9539  ARPA   Vlan2

DSA#sh mac address-table address 0017.9a7a.9539
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----

[Fabio Semperboni]

Hi,

you can bring the ARP timeout and the forwarding table-aging time close to each other.

Fabio

[typeonegative]

Hey,

tried everything in this case. Everyhing wents OK after removing switchport block unicast from that interface, which has the mac. Maybe the switchport block unicast should be applied on access instead of trunk?

Donatas.

[Fabio Semperboni]

Hi,

Are you sure that your network doesn't suffer of Asymmetric routing?

Recently, I have written a tutorial about this problem:

http://www.ciscozine.com/2012/04/15/unicast-flooding-due-to-asymmetric-routing/

Fabio