From: Dillon Yang (dillony@gmail.com)
Date: Sat Sep 03 2005 - 00:49:11 GMT-3
In this case, tunnel source must be a base physical interface which
connetivity is independent from the area 0 , not logical
one, or you get this:
*Mar 1 02:19:06: %SYS-5-CONFIG_I: Configured from console by console
*Mar 1 02:19:09: %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to
recursive routing
*Mar 1 02:19:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0,
changed state t
o down
*Mar 1 02:19:10: %OSPF-5-ADJCHG: Process 3, Nbr 1.1.1.1 on Tunnel0 from
FULL to DOWN, Nei
ghbor Down: Interface down or detached
*Mar 1 02:19:18: %OSPF-5-ADJCHG: Process 3, Nbr 1.1.1.1 on OSPF_VL0 from
FULL to DOWN, Ne
ighbor Down: Interface down or detached
*Mar 1 02:20:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0,
changed state t
o up
*Mar 1 02:20:20: %OSPF-5-ADJCHG: Process 3, Nbr 1.1.1.1 on Tunnel0 from
LOADING to FULL,
Loading Done
*Mar 1 02:20:36: %OSPF-5-ADJCHG: Process 3, Nbr 1.1.1.1 on OSPF_VL0 from
LOADING to FULL,
Loading Done
*Mar 1 02:21:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0,
changed state
to down
*Mar 1 02:21:59: %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to
recursive routing
*Mar 1 02:22:00: %OSPF-5-ADJCHG: Process 3, Nbr 1.1.1.1 on Tunnel0 from
FULL to DOWN, Nei
ghbor Down: Interface down or detached
*Mar 1 02:22:00: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0,
changed state t
o down
*Mar 1 02:22:06: %OSPF-5-ADJCHG: Process 3, Nbr 1.1.1.1 on OSPF_VL0 from
FULL to DOWN, Ne
ighbor Down: Interface down or detached
*Mar 1 02:23:00: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0,
changed state t
o up
*Mar 1 02:23:21: %OSPF-5-ADJCHG: Process 3, Nbr 1.1.1.1 on Tunnel0 from
LOADING to FULL,
Loading Done
*Mar 1 02:23:39: %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to
recursive routing
*Mar 1 02:23:40: %OSPF-5-ADJCHG: Process 3, Nbr 1.1.1.1 on Tunnel0 from
FULL to DOWN, Nei
Remember:
1. the GRE is just an additional PDU like this
(20bytes)TRANSIT packet header(Transit source address, Transit destination
address)
(4byets)GRE packet header
Your ORIGINAL IP header(GRE source address, GRE destination address)
In any case, you'd better set ip mtu to 1500-20-4=1476.
2. For OSPF neighborhood, the GRE source address and the GRE destination
address should be on the same subnet.
So, you may config like this:
!
interface Tunnel 0
ip address <GRE source address>
tunnel source <Transit source address> or <name_of_interface>
tunnel destination <Transit destination address>
ip mtu 1476
!
router ospf 7
network <GRE source address> 0.0.0.0 area 0
!
HTH
dillon
----- Original Message -----
From: <nhqky888@ybb.ne.jp>
To: <ccielab@groupstudy.com>
Sent: Friday, September 02, 2005 4:10 PM
Subject: Re: Re: Tunneling over OSPF
> Hi Dillon,
>
> I did addressing on both tunnel ints,
> however, soon both ints became down, and I gave up its method.
>
> The reason why their tunnel ints address are not on ospf proces,
> I quess.
>
> I will do what you mentioned.
>
>
> Thanks,
>
> KY
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sun Oct 02 2005 - 14:40:13 GMT-3