Configuring a Tunnel Interface
You can configure the tunnel interface using the ip unnumbered and ipv6 unnumbered commands.
To configure the tunnel interface to operate without a unique explicit ip or ipv6 address, select the
interface from which the tunnel will borrow its address.
The following sample configuration shows how to use the tunnel interface configuration commands.
Dell(conf-if-te-0/0)#show config
!
interface TenGigabitEthernet 0/0
ip address 20.1.1.1/24
ipv6 address 20:1::1/64
no shutdown
Dell(conf)#interface tunnel 1
Dell(conf-if-tu-1)#ip unnumbered tengigabitethernet 0/0
Dell(conf-if-tu-1)#ipv6 unnumbered tengigabitethernet 0/0
Dell(conf-if-tu-1)#tunnel source 40.1.1.1
Dell(conf-if-tu-1)#tunnel mode ipip decapsulate-any
Dell(conf-if-tu-1)#no shutdown
Dell(conf-if-tu-1)#show config
!
interface Tunnel 1
ip unnumbered TenGigabitEthernet 0/0
ipv6 unnumbered TenGigabitEthernet 0/0
tunnel source 40.1.1.1
tunnel mode ipip decapsulate-any
no shutdown
Dell(conf-if-tu-1)#
Configuring Tunnel allow-remote Decapsulation
You can configure an IPv4 or IPV6 address or prefix whose tunneled packet will be accepted for
decapsulation.
• If no allow-remote entries are configured, then tunneled packets from any remote peer address will
be accepted.
• Upto eight allow-remote entries can be configured on any particular multipoint receive-only tunnel.
The following sample configuration shows how to configure a tunnel allow-remote address.
Dell(conf)#interface tunnel 1
Dell(conf-if-tu-1)#ipv6 address 1abd::1/64
Dell(conf-if-tu-1)#ip address 1.1.1.1/24
Dell(conf-if-tu-1)#tunnel source 40.1.1.1
Dell(conf-if-tu-1)#tunnel mode ipip decapsulate-any
Dell(conf-if-tu-1)#tunnel allow-remote 40.1.1.2
Dell(conf-if-tu-1)#no shutdown
Dell(conf-if-tu-1)#show config
!
interface Tunnel 1
ip address 1.1.1.1/24
ipv6 address 1abd::1/64
tunnel source 40.1.1.1
tunnel allow-remote 40.1.1.2
tunnel mode ipip decapsulate-any
no shutdown
898 Tunneling