Users Guide

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 conguring 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.
.
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
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.5(0.1) Introduced on the Z9500.
9.4(0.0) Added the decapsulate-any command.
9.3(0.1) Introduced on the S6000 and Z9000.
Usage Information
To enable a tunnel interface, use this command. You must dene a tunnel mode for the tunnel to function. If
you previously dened 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 congured: tunnel destination, tunnel dscp, tunnel ow-label, tunnel hop-limit, or tunnel
1548
Tunneling