Configuring Tunnel Source Anylocal Decapsulation; Guidelines For Configuring Multipoint Receive-Only Tunnels; Multipoint Receive-Only Tunnels - Dell S6100 Configuration Manual

Configuring Tunnel source anylocal Decapsulation

The tunnel source anylocal command allows a multipoint receive-only tunnel to decapsulate tunnel packets addressed to any
IPv4 or IPv6 (depending on the tunnel mode) address configured on the switch that is operationally UP.
The source anylocal parameters can be used for packet decapsulation instead of the ip address or interface (tunnel allow-
remote command), but only on multipoint receive-only mode tunnels.
The following sample configuration shows how to use the tunnel source anylocal command.
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 anylocal
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 anylocal
tunnel allow-remote 40.1.1.2
tunnel mode ipip decapsulate-any
no shutdown
Guidelines for Configuring Multipoint Receive-Only
Tunnels
• You can configure up to eight remote end-points for a multipoint receive-only tunnel. The maximum number of remote end-points
supported for all multipoint receive-only tunnels on the switch depends on the hardware table size to setup termination.
• The IP MTU configured on the physical interface determines how multiple nested encapsulated packets are handled in a multipoint
receive-only tunnel.
• Control-plane packets received on a multipoint receive-only tunnel are destined to the local IP address and routed to the CPU after
decapsulation. A response to these packets from the switch is only possible if the route to the sender does not pass through a receive-
only tunnel.
• Multipathing over more than one VLAN interface is not supported on packets routed through the tunnel interface.
• IP tunnel interfaces are supported over ECMP paths to the next hop. ECMP paths over IP tunnel interfaces are supported. ARP and
neighbor resolution for the IP tunnel next-hop are supported.

Multipoint Receive-Only Tunnels

A multipoint receive-only IP tunnel decapsulates packets from remote end-points and never forwards packets on the tunnel. You can
configure an additional level of security on a receive-only IP tunnel by specifying a valid prefix or range of remote peers.
The operational status of a multipoint receive-only tunnel interface always remains up. Packets from the remote addresses configured for a
multipoint receive-only tunnel are decapsulated and are not marked for neighbor resolution as for a standard tunnel's destination address.
Connected routes for the tunnel interface's IP subnet do not point towards the tunnel but towards the switch CPU for the receive-only
tunnel. The tunnel interface can function as an unnumbered interface with no IPv4/IPv6 address assigned.
Tunneling 857