This documents illustrates an issue faced by an user.
What is ARP?
ARP stands for Address Resolution Protocol. It converts IP address to its corresponding MAC address. It is a low-level network protocol,which operates at Layer 2 of OSI model.
What is Vlan?
VLAN can be defined as a virtual LAN. In other words we can say VLAN is a broadcast domain which is created by switch.
We need a VLAN when:
This occurs when both the public and private VPN concentrator interfaces are connected to the same VLAN. This situation causes multiple entries in the Address Resolution Protocol (ARP) table.
This issue is due to the presence of Cisco bug ID CSCei07252.
As a workaround, perform one of these steps:
VPN 3000 series
Virtual Local Area Networks (VLANs)