From: David Timmons (masterdt@yahoo.com)
Date: Sat Jul 08 2006 - 17:45:57 ART
HI,
Virtual-links and OSPF authentication have plagued me!
Since I started on labs, each time I see area 0
authentication w/ virtual-links and take a very staged
approach to the setup:
1) Area 0 authention on backbone routers
2) No area 0 authen on virtual-link end pont.No
related paramters on virtual link command. Looks for
authentication errors on parent side of link and add
the required commands. Since I started doing this, I
have not had any issues with the virtual links.
To this day, I really don't understand why they don't
always come up! I have had many cases that the
configurations looked fine and they would not make an
attempt to come up. These are some of the steps that I
follow to resolve the problems:
Assuming you have configured area 0 authentication:
1) Remove area 0 related commands on router that is
the end-point for a virutal links. Sometimes, I start
to get messages about authentication not matching. I
put back area 0 authentication related commands for
area and virtual link and it comes up!
2) copy router ospf x related configuration and do no
router ospf 1 on both ends of the virtual link.
Past the configuration back.... and bang.. up comes
the virtual link
3) Reboot both ends of the virtual link. I have tried
to reboot one end or the other; however, doing both
seems to help the most.
I think this is caused by the way I setup OSPF;
however, I have not really figured out why it happens.
In some cases, I have expected problems because I
changed a router-id and a clear ip ospf proc works
just fine. Other times, I have to jump thru hoops!
dt
--- "Russell Kelly (rukelly)" <rukelly@cisco.com>
wrote:
> Hi All,
>
> I am running into trouble with Virtual links in OSPF
> --- I keep getting
> the following states with the Virtual link (below)
> ---
>
> The router IDs are correct -- the link is a simple
> back to back ppp link
> (with an OSPF adj over it) -- -however I keep
> getting the following:
>
> On one side:
>
> Virtual Link OSPF_VL2 to router 150.1.5.5 is up
> Run as demand circuit
> DoNotAge LSA allowed.
> Transit area 45, via interface Serial0/1, Cost of
> using 64
> Transmit Delay is 1 sec, State POINT_TO_POINT,
> Timer intervals configured, Hello 10, Dead 40,
> Wait 40, Retransmit 5
> No Hellos (Passive interface)
> Adjacency State INIT (Hello suppressed)
> Index 0/0, retransmission queue length 0, number
> of retransmission 0
> First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
> Last retransmission scan length is 0, maximum is
> 0
> Last retransmission scan time is 0 msec, maximum
> is 0 msec
>
> On the other:
>
> Virtual Link OSPF_VL0 to router 150.1.4.4 is up
> Run as demand circuit
> DoNotAge LSA allowed.
> Transit area 45, via interface Serial0/1, Cost of
> using 64
> Transmit Delay is 1 sec, State POINT_TO_POINT,
> Timer intervals configured, Hello 10, Dead 40,
> Wait 40, Retransmit 5
> Hello due in 00:00:02
>
> I am stumped --- all looks fine --- but I'm sure
> I'm missing
> something... HELP --- this should be soo
> simple....??...!!
>
> Here are the relevant pieces of config too:
>
> interface Serial0/1
> ip address 191.1.45.5 255.255.255.128
> encapsulation ppp
> ip tcp header-compression
> ip tcp compression-connections 256
> clockrate 64000
> !
> router ospf 1
> router-id 150.1.5.5
> log-adjacency-changes
> area 45 virtual-link 150.1.4.4
> redistribute connected subnets route-map LO0
> passive-interface default
> no passive-interface Serial0/0
> no passive-interface Serial0/1
> network 191.1.5.5 0.0.0.0 area 5
> network 191.1.45.5 0.0.0.0 area 45
> network 191.1.125.5 0.0.0.0 area 0
>
> ==============================
>
>
> interface Serial0/1
> ip address 191.1.45.4 255.255.255.128
> encapsulation ppp
> ip tcp header-compression
> ip tcp compression-connections 256
> !
> router ospf 1
> router-id 150.1.4.4
> log-adjacency-changes
> area 45 virtual-link 150.1.5.5
> redistribute connected subnets route-map LO0
> passive-interface default
> no passive-interface Serial0/0
> no passive-interface FastEthernet0/1
> no passive-interface Serial0/1
> network 191.1.34.4 0.0.0.0 area 34
> network 191.1.45.4 0.0.0.0 area 45
> network 191.1.48.4 0.0.0.0 area 4
>
> Russ
>
>
This archive was generated by hypermail 2.1.4 : Tue Aug 01 2006 - 07:13:47 ART