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

2a. Make sure newly created Loopbacks are reachable through MPLS
backbone and not through OSPF.

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Marko Milivojevic - CCIE #18427
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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
>
> B  B R5
>
> B  B interface Loopback200
> B  B  ip vrf forwarding VPN_A
> B  B ip address 1.1.1.1 255.255.255.255
>
> B  B R6
>
> B  B interface Loopback200
> B  B ip vrf forwarding VPN_A
> B  B ip address 2.2.2.2 255.255.255.255
>
>
> 2. Advertise /32 loopback other than OSPF, so advertised via BGP
>
> B  B R5
>
> B  B router bgp 100
> B  B address-family ipv4 vrf VPN_A
> B  B network 1.1.1.1 mask 255.255.255.255
>
>
> B  B R6
>
> B  B router bgp 100
> B  B address-family ipv4 vrf VPN_A
> B  B network 2.2.2.2 mask 255.255.255.255
>
>
> 3. create sham-link
>
> B  B R5
>
> B  B router ospf 10 vrf VPN_A
> B  B area 1 sham-link 1.1.1.1 2.2.2.2 cost 1
>
> B  B R6
>
> B  B router ospf 10 vrf VPN_A
> B  B 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
> B ip vrf forwarding VPN_A
> B ip address 1.1.1.1 255.255.255.255
>
> router ospf 10 vrf VPN_A
> B log-adjacency-changes
> B redistribute bgp 100 subnets tag 667
> B network 155.1.58.5 0.0.0.0 area 1
> B area 1 sham-link 1.1.1.1 2.2.2.2 cost 1
>
> router ospf 1
> B log-adjacency-changes
> B network 0.0.0.0 255.255.255.255 area 0
>
>
> router bgp 100
> B no bgp default ipv4-unicast
> B bgp log-neighbor-changes
> B neighbor 150.1.4.4 remote-as 100
> B neighbor 150.1.4.4 update-source Loopback0
> B !
> B address-family vpnv4
> B neighbor 150.1.4.4 activate
> B neighbor 150.1.4.4 send-community extended
> B exit-address-family
>
> B address-family ipv4 vrf VPN_A
> B redistribute connected
> B redistribute static
> B redistribute ospf 10 vrf VPN_A
> B no synchronization
> B network 1.1.1.1 mask 255.255.255.255
> B exit-address-family
>
>
> R6
>
> interface Loopback200
> B ip vrf forwarding VPN_A
> B ip address 2.2.2.2 255.255.255.255
>
> router ospf 10 vrf VPN_A
> B log-adjacency-changes
> B summary-address 172.16.0.0 255.255.0.0
> B redistribute bgp 100 subnets tag 666
> B 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
> B log-adjacency-changes
> B network 0.0.0.0 255.255.255.255 area 0
>
> router bgp 100
> B no bgp default ipv4-unicast
> B bgp log-neighbor-changes
> B neighbor 150.1.4.4 remote-as 100
> B neighbor 150.1.4.4 update-source Loopback0
> B !
> B address-family vpnv4
> B neighbor 150.1.4.4 activate
> B neighbor 150.1.4.4 send-community extended
> B exit-address-family
>
>
> B address-family ipv4 vrf VPN_A
> B redistribute connected
> B redistribute static
> B redistribute ospf 10 vrf VPN_A
> B no synchronization
> B network 2.2.2.2 mask 255.255.255.255
> B exit-address-family
>
> Mar B 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 B 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 B 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 B 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 B 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 B 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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