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

I mean "It will fix your flapping issue.", I'm sorry but it's totally up to
you. :D

:D

BR,

On 1 July 2011 13:36, Alberto Santos <albertofsantos_at_gmail.com> wrote:

> Hey there,
>
> I think the issue here is that you are messing with vpn tag for external
> ospf routes by setting a tag in the redistribute.
> because vpn tags are different each PE learns a route to PE's loopback via
> backdoor and makes the BGP learned route RIB.
> Try to remove the tags so each PE uses the BGP route instead of OSPF route
> to reach the sham link end point. I will fix your flapping issue.
>
> 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
> 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
>
>
> 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
> 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
>
>
>
>
>
>
> On 1 July 2011 12:32, Abdullah Al-Malki <a.almalki1402_at_gmail.com> wrote:
>
>> I think you do not need the "redistribute connected under bgp IP address
>> family of vrf A"
>>
>> On Fri, Jul 1, 2011 at 6:28 PM, 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
>> > >
>> > > 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
>> > >
>> > >
>> > > Blogs and organic groups at http://www.ccie.net
>> > >
>> > >
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>
>
> --
> *Alberto*
>

-- 
*Alberto*
Blogs and organic groups at http://www.ccie.net