The document discusses the implementation of L2TPv3 tunnel termination over an IPv6 network, detailing configuration guidelines for CentOS 7. It provides commands for OSPFv3 and L2TPv3 setup, including high availability and tunnel failover mechanisms. A sample script for establishing L2TPv3 tunnels is included, demonstrating operational procedures.

1. 25-Feb-2015
SAKURA Internet Research Center.
Senior Researcher / Naoto MATSUMOTO

2. Basic Ideas
L2TPv3 Tunnel termination over IPv6 network

3. How does it work?
Up to 9M L2TPv3 tunnels or 16M vSwitches

4. How to build it (CentOS7)

5. OSPFv3 & L2TPv3 Configuration

6. vSwitch(Bridge) Configuration

7. Check your L2TPv3 tunnel
# tcpdump -i eeaaaaaa1065530
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eeaaaaaa1065530, link-type EN10MB (Ethernet), ...
...178229 ARP, Request who-has 10.255.255.255 (Broadcast) ...
...179250 ARP, Request who-has 10.255.255.255 (Broadcast) ...
...180326 ARP, Request who-has 10.255.255.255 (Broadcast) ...
:
# arping 10.255.255.255 -I eeaaaaaa1065530
:
^C

8. Fast OSPFv3 Link Update
# vtysh
# configure terminal
# interface eth0
# ipv6 ospf6 hello-interval 1
# ipv6 ospf6 retransmit-interval 2
# ipv6 ospf6 dead-interval 3
# interface eth1
# ipv6 ospf6 hello-interval 1
# ipv6 ospf6 retransmit-interval 2
# ipv6 ospf6 dead-interval 3
:
# end
# write
# quit
# vtysh
# configure terminal
# interface eth0
# ipv6 ospf6 hello-interval 1
# ipv6 ospf6 retransmit-interval 2
# ipv6 ospf6 dead-interval 3
# interface eth1
# ipv6 ospf6 hello-interval 1
# ipv6 ospf6 retransmit-interval 2
# ipv6 ospf6 dead-interval 3
:
# end
# write
# quit

9. vSwitch High Availability
L2TPv3 Tunnel failover using OSPFv3 LSA update

10. L2TPv3 Tunnel kickstart script
#!/bin/bash
exec 2> /tmp/eeaaaaaa1065530.log
exec 1>&2
set -x
while true; do
sleep 10
ip l2tp add tunnel
local fd50:eeaa:aaaa:ffff:eeaa:aaaa:106:5530
remote fd50:d026:7eee:1001:eeaa:aaaa:106:5530
tunnel_id 1065530 peer_tunnel_id 1065530
udp_sport 1701 udp_dport 1701 encap udp
ip l2tp add session name eeaaaaaa1065530
tunnel_id 1065530 session_id 1065530
peer_session_id 1065530
nmcli device disconnect eeaaaaaa1065530
if [ $(/usr/sbin/ip link show | grep -o eeaaaaaa1065530 | wc -l ) -ne 0 ]; then
break
fi
done
exit 0

11. Thanks for your interset.
SAKURA Internet Research Center.