Unable to Ping ARP Entry

[cer43tcent]

Hello.  I have a 6500 that has a portchannel to a layer 2 Brocade VDX .  On the VDX there is a mgmt interface and the vlans are L2.  Also, ESXi hosts connect to the Brocades and are assigned to VLAN 57.  ARP entries of those ESXi hosts show up on the layer 3 6500 switch, but I am unable to ping any of the IP addresses.  From the 6500 I can't even ping the ESXi host using its subnet's IP as the source.  The age (min) of those entries remain at 0.  Any recommendations.

[Marvin Rhoads]

An ARP entry only indicates a MAC-IP address correlation.

Inability to ping (or more precisely get an icmp echo reply in response to an icmp echo request) can be due to several thing.

The most common cause is that the host doesn't not respond to pings. Can it be pinged from any other host?

The second most common cause is that a host-based firewall (or iptables etc.) doesn't allow the source of your pings.

Can you connect to the target using tcp on an open port? That's a more definitive connectivity test.