Re: OSPF_SL0 from FULL to DOWN, Neighbor Down: Interface down

I have adverstised both loopbacks via BGP. I can see both /32's are learned
via BGP when tunnel is down and when sham-link is up for few seconds, I see
that routes are now advertised via OSPF.

Am I missing something-

Thanks,

Bilal Hansrod

On Sat, Jul 2, 2011 at 1:28 AM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> 2a. Make sure newly created Loopbacks are reachable through MPLS
> backbone and not through OSPF.
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
> FREE CCIE training: http://bit.ly/vLecture
>
> Mailto: markom_at_ipexpert.com
> Telephone: +1.810.326.1444
> Web: http://www.ipexpert.com/
>
> On Fri, Jul 1, 2011 at 04:53, Bilal Hansrod <bilal.hansrod_at_gmail.com>
> wrote:
> > Hi All,
> >
> > I am labbing up a sham-link to prefer MPLS path over backdoor OSPF route.
> > The lab set-up is simple as below:
> >
> > R5 -> R4 (RR) -> R6
> >
> > I am creating a sham-link from R5 to R6, so I followed the below steps:
> >
> > 1. Create loopback 200 on both routers and assign to vrf
> >
> > R5
> >
> > interface Loopback200
> > ip vrf forwarding VPN_A
> > ip address 1.1.1.1 255.255.255.255
> >
> > R6
> >
> > interface Loopback200
> > ip vrf forwarding VPN_A
> > ip address 2.2.2.2 255.255.255.255
> >
> >
> > 2. Advertise /32 loopback other than OSPF, so advertised via BGP
> >
> > R5
> >
> > router bgp 100
> > address-family ipv4 vrf VPN_A
> > network 1.1.1.1 mask 255.255.255.255
> >
> >
> > R6
> >
> > router bgp 100
> > address-family ipv4 vrf VPN_A
> > network 2.2.2.2 mask 255.255.255.255
> >
> >
> > 3. create sham-link
> >
> > R5
> >
> > router ospf 10 vrf VPN_A
> > area 1 sham-link 1.1.1.1 2.2.2.2 cost 1
> >
> > R6
> >
> > router ospf 10 vrf VPN_A
> > area 1 sham-link 2.2.2.2 1.1.1.1 cost 1
> >
> >
> > Once I enabled sham-link command, the link starts to flaps. The OSPF_SL
> > interface comes up and than within seconds it shows Interface down or
> > detached. Please see full configuration as below with error messages
> >
> >
> >
> > R5
> >
> > interface Loopback200
> > ip vrf forwarding VPN_A
> > ip address 1.1.1.1 255.255.255.255
> >
> > router ospf 10 vrf VPN_A
> > log-adjacency-changes
> > redistribute bgp 100 subnets tag 667
> > network 155.1.58.5 0.0.0.0 area 1
> > area 1 sham-link 1.1.1.1 2.2.2.2 cost 1
> >
> > router ospf 1
> > log-adjacency-changes
> > network 0.0.0.0 255.255.255.255 area 0
> >
> >
> > router bgp 100
> > no bgp default ipv4-unicast
> > bgp log-neighbor-changes
> > neighbor 150.1.4.4 remote-as 100
> > neighbor 150.1.4.4 update-source Loopback0
> > !
> > address-family vpnv4
> > neighbor 150.1.4.4 activate
> > neighbor 150.1.4.4 send-community extended
> > exit-address-family
> >
> > address-family ipv4 vrf VPN_A
> > redistribute connected
> > redistribute static
> > redistribute ospf 10 vrf VPN_A
> > no synchronization
> > network 1.1.1.1 mask 255.255.255.255
> > exit-address-family
> >
> >
> > R6
> >
> > interface Loopback200
> > ip vrf forwarding VPN_A
> > ip address 2.2.2.2 255.255.255.255
> >
> > router ospf 10 vrf VPN_A
> > log-adjacency-changes
> > summary-address 172.16.0.0 255.255.0.0
> > redistribute bgp 100 subnets tag 666
> > network 155.1.67.6 0.0.0.0 area 1
> > area 1 sham-link 2.2.2.2 1.1.1.1 cost 1
> >
> > router ospf 1
> > log-adjacency-changes
> > network 0.0.0.0 255.255.255.255 area 0
> >
> > router bgp 100
> > no bgp default ipv4-unicast
> > bgp log-neighbor-changes
> > neighbor 150.1.4.4 remote-as 100
> > neighbor 150.1.4.4 update-source Loopback0
> > !
> > address-family vpnv4
> > neighbor 150.1.4.4 activate
> > neighbor 150.1.4.4 send-community extended
> > exit-address-family
> >
> >
> > address-family ipv4 vrf VPN_A
> > redistribute connected
> > redistribute static
> > redistribute ospf 10 vrf VPN_A
> > no synchronization
> > network 2.2.2.2 mask 255.255.255.255
> > exit-address-family
> >
> > Mar 1 00:56:20.951: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.5.5 on
> OSPF_SL0
> > from LOADING to FULL, Loading Done
> > *Mar 1 00:56:22.103: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.5.5 on
> OSPF_SL0
> > from FULL to DOWN, Neighbor Down: Interface down or detached
> > *Mar 1 00:56:40.835: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.5.5 on
> OSPF_SL0
> > from LOADING to FULL, Loading Done
> > *Mar 1 00:56:42.099: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.5.5 on
> OSPF_SL0
> > from FULL to DOWN, Neighbor Down: Interface down or detached
> > *Mar 1 00:57:01.427: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.5.5 on
> OSPF_SL0
> > from LOADING to FULL, Loading Done
> > *Mar 1 00:57:02.103: %OSPF-5-ADJCHG: Process 10, Nbr 172.16.5.5 on
> OSPF_SL0
> > from FULL to DOWN, Neighbor Down: Interface down or detached
> >
> >
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Received on Sat Jul 02 2011 - 09:49:33 ART