IS-IS quagga IPv6 configuration

I am going to also support IPv6 in my replay tool for this year's GSoC. In order to better understand how IPv6 works with IS-IS, here are the few changes needed to the IPv4 configuration files:

First router:

! -*- isis -*-

hostname isisd
password foo
enable password foo
log stdout

hostname isisd-router
!  area-password foobar
!  domain-password foobar

interface eth1
 ip router isis Test1
 ipv6 router isis Test1
 isis hello-interval 5
! isis lsp-interval 1000

router isis Test1
  net 49.0001.1111.1111.1111.00
  is-type level-1
  metric-style wide

Second router:

! -*- isis -*-

hostname isisd
password foo
enable password foo
log stdout

hostname isisd-router
!  area-password foobar
!  domain-password foobar

interface eth1
 ip router isis Test1
 ipv6 router isis Test1
 isis hello-interval 5

router isis Test1
  net 49.0001.2222.2222.2222.00
  is-type level-1
  metric-style wide

The two files will support both IPv4 and IPv6, if you want only one of them to be supported, simply comment one of the ip or ipv6 lines.

The two routers need to be able to 'see' each other:

ping6 -I eth1 fe80::20c:29ff:fef4:67aa
PING fe80::20c:29ff:fef4:67aa(fe80::20c:29ff:fef4:67aa) from fe80::20c:29ff:fe47:e4a1 eth1: 56 data bytes
64 bytes from fe80::20c:29ff:fef4:67aa: icmp_seq=1 ttl=64 time=1.95 ms
64 bytes from fe80::20c:29ff:fef4:67aa: icmp_seq=2 ttl=64 time=0.246 ms
64 bytes from fe80::20c:29ff:fef4:67aa: icmp_seq=3 ttl=64 time=0.299 ms

Here are the wireshark captures with the IPv6 packets. They appear in the HELLO messages.