From: Danny Cox (dandermanuk@gmail.com)
Date: Sun Sep 25 2005 - 20:13:55 GMT-3
I think this didn't reach the list, so this is a re-post - apologies
if it's reached everyone but me.
...
I thought I'd try to get it running directly over frame relay to find
that the 'frame relay map ipv6' command, while listed, is not
available in my IOS - at least not on the 2600s I was using to try
this side experiment. Next I experimented putting a tunnel into
RIPng, which is what I was bashing my head over to begin with. The
original tunnel which I couldn't persuade to do as I wanted, was
tunnelling ipv6in4 across a frame relay cloud.
I have found that changing the tunnel mode to ipv6ip stops this
working for RIPng. If I take it out then I get a nice little heap of
routes into my 6routing table.
To summarise, I've found that loopbacks don't get advertised into the
RIPng database, that tunnels don't if I change the tunnel mode to
ipv6ip, that serial interfaces only do if connected directly and not
via FR.
My tunnels were:
int tu 0
ipv6 address 2000:1:1:2255::2/64
tunnel source 150.50.100.2
tunnel destination 150.50.100.5
ipv6 rip cisco25 enable
!
And vice-versa at the other end
int tu 0
ipv6 address 2000:1:1:2255::5/64
tunnel source 150.50.100.5
tunnel destination 150.50.100.2
ipv6 rip cisco25 enable
!
This works fine. I've seen various configs on my trawl through CCO
which suggest that I should specify an interface rather than an IP
address to source the tunnel from and use the 'tunnel mode ipv6ip'
command, but this doesn't populate the RIPng tables.
I've confirmed that the other end of the tunnel is pingable
I'd much much rather understand what's happening - I feel like an
experimental fool at the minute just plugging things in to see what
will work. Can anyone guide me about:
a) what's special about 'tunnel mode ipv6ip'
b) why loopbacks don't make it into the RIPng database
many thanks all
Danny
On 25/09/05, Danny Cox <dandermanuk@gmail.com> wrote:
> I'm after a sanity check here - running a 3640 with Fast Ethernets and
> Serial interfaces, needing to run two copies of RIPng on it. Output
> of 'show ipv6 route database' only shows entries in one of them.
> Without rewiring things I can't cut&paste from my lab to this PC,. but
> the config is more or less as follows:
>
> int fa 3/0
> ipv6 address 2000:1:1:67::6/64
> ipv6 rip cisco12 enable
> !
> int fa 3/0.1
> ipv6 address 2000:1:1:68::6/64
> ipv6 rip cisco67 enable
> !
> int lo 0
> ipv6 address 2000:1:1:6600::/64
> ipv6 rip cisco67 enable
> !
> int lo 1
> ipv6 address 2000:1:6800::6/64
> ipv6 rip cisco67 enable
>
>
> cisco67 only holds entries for fa3/0.1 and not the loopbacks. I also
> tried doing something similar with other serial interfaces but that
> didn't help. Now I know I need to do more reading and understanding
> of IPv6, but this hasn't struck me so far as obvious behaviour. Can
> anyone point me in the right direction?
>
> For reference, I'm runnning IOS 12.2(15)T17
>
> many thanks !
>
> Danny
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