Cisco Cisco IOS Software Release 12.2(27)SBC

To enable virtual private dialup network (VPDN) multihop, use the vpdn multihop command in global 
configuration mode. To disable VPDN multihop capability, use the no form of this command.

This command has no arguments or keywords.

Multihop is disabled.

Global configuration

Use this command to enable multihop VPDN. Multihop VPDN allows packets to pass through multiple 
VPDN tunnels. Ordinarily, packets are not allowed to traverse more than one tunnel. With multihop 
enabled, a packet may traverse as many as four tunnels.

VPDN multihop allows a router configured as a tunnel switch to act as both a network access server 
(NAS) and a tunnel server, receiving packets from an incoming VPDN tunnel and sending them out over 
an outgoing VPDN tunnel. 

A tunnel switch may terminate incoming VPDN tunnels from multiple devices, and initiate outgoing 
tunnels to one or more tunnel servers. The outgoing tunnel is selected using either a domain name, a 
remote tunnel name, or a DNIS number. The order in which these criteria are searched by the Cisco IOS 
software is determined by the vpdn search-order command.

VPDN multihop must be enabled for a Multichassis Multilink PPP (MMP) stack group deployment to 
function when incoming calls traverse a VPDN tunnel. For more information on configuring multihop 
VPDN for MMP, refer to the Cisco IOS VPDN Configuration Guide.

11.3(5)T

This command was introduced.

12.2(8)B

Support was added for dialed number identification service (DNIS)-based 
multihop capability.

12.2(13)T

Support was added for DNIS-based multihop capability.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB, including 
support for DNIS-based multihop capability.