Administrator Guide

Version Description
9.4(0.0) Introduced on the S4810, S4820T, S6000 and Z9000.
Usage Information
Enabling tunnel keepalive causes ICMP echo packets to be sent to the keepalive target. The ICMP echo will be
sourced from the tunnel interface logical IPv4 or IPv6 address and will be tunnel encapsulated. The response will
be accepted whether it returns tunnel encapsulated or not.
When configuring tunnel keepalive at both end points of a tunnel interface it is recommended to set the tunnel
keepalive target to the logical IPv4 or IPv6 address of the far end tunnel peer, rather than to the tunnel
destination. This reduces the chance of both ends of the tunnel staying in keepalive down state. If both ends get
into a keepalive down state that does not clear in a few seconds, then performing shutdown - no shutdown
sequence on one end should bring both ends back to up.
tunnel-mode
Enable a tunnel interface.
.
C9000 Series
Syntax
tunnel mode {ipip | ipv6 | ipv6ip}[decapsulate-any]
To disable an active tunnel interface, use the no tunnel mode command.
Parameters
ipip Enable tunnel in RFC 2003 mode and encapsulate IPv4 and/or IPv6 datagrams inside an
IPv4 tunnel.
ipv6 Enable tunnel in RFC 2473 mode and encapsulate IPv4 and/or IPv6 datagrams inside an
IPv6 tunnel.
ipv6ip Enable tunnel in RFC 4213 mode and encapsulate IPv6 datagrams inside an IPv4 tunnel.
decapsulate-any (Optional) Enable tunnel in multipoint receive-only mode.
Defaults There is no default tunnel mode.
Command Modes INTERFACE TUNNEL
Command History
Version Description
9.9(0.0) Introduced on the C9010.
9.7(0.0) Introduced on the S6000-ON.
9.3(0.1) Introduced on the S6000 and Z9000.
9.4(0.0) Added the decapsulate-any command.
Usage Information
To enable a tunnel interface, use this command. You must define a tunnel mode for the tunnel to function. If you
previously defined the tunnel destination or source address, the tunnel mode must be compatible.
Including the decapsulate-any option causes the command to fail if any of the following tunnel transmit options
are configured: tunnel destination, tunnel dscp, tunnel flow-label, tunnel hop-limit, or tunnel keepalive. Conversely,
if you configure any tunnel allow-remote entries, the
tunnel—mode command fails unless the decapsulate-any
option is included.
Configuration of IPv6 commands over decapsulate-any tunnel causes an error.
1656 Tunneling Commands