We have IP device(exchange server, it might be a cluster) on the farm switch(cat6500, which is an access layer siwtch), with the gateway on the core switches (Nexus7000), on the core when I do show ip arp, I found the mac
But when I do sh mac add add of that mac there is no port attached to that mac.
Since that particular vlan only resides on the cat 6500 and two cores, so I logged in to the 6500, and when I show mac- in that vlan, I didn’t find that mac addresss. Instead, I found another mac address with last 8bit are the same of that mac.
Is it some kind VIP of the mac? How so, if no port, how can the switch forward the frame??
Anyone can give some light? I put some show results, hope it is helpful.
By the way, I can ping that IP of the mac.
Thanks,
Han
===========on the core, i did=========
core-2# sh ip arp 10.1.10.6
IP ARP Table
Total number of entries: 1
Address Age MAC Address Interface
10.1.10.6 00:08:44 02bf.0a01.0a06 Vlan906
core-2# sh mac add add 02bf.0a01.0a06
Legend:
* - primary entry, G - Gateway MAC, (R) - Routed MAC
age - seconds since last seen,+ - primary entry using vPC Peer-Link
VLAN MAC Address Type age Secure NTFY Ports
---------+-----------------+--------+---------+------+----+------------------
core-2#
==========on the access layer switch, i did=====
SFARM6513-2#sh mac- | i .0a01.0a06
* 906 0202.0a01.0a06 dynamic Yes 0 Gi4/41
* 906 0201.0a01.0a06 dynamic Yes 0 Gi9/40
