Re: PE-CE: OSPF routes appears with IGP origin

Hi Nagendra,

I remembered seeing this, when there exist OSPF backdoor. Do you have any
OSPF backdoor here?

Thanks,
Srinivas

On Fri, Jun 26, 2009 at 10:24 AM, NN Kumar <nagendra.cisco_at_gmail.com> wrote:

> Hi All,
> At what situation will a redistribute OSPF routes in BGP will appear as IGP
> origin?.
>
> I am running MP-BGP on a PE router with OSPF as PE-CE routing protocol. I
> redistribute OSPF into MP-BGP. To my knowledge it is suppose to be
> incomplete origin. But it shows as IGP.
>
> This influence the best path selection and I am into sub optimal routing
> now.
>
> R2#sh run | sec bgp
> redistribute bgp 100 subnets
> router bgp 100
> bgp router-id 24.1.2.2
> no bgp default ipv4-unicast
> bgp log-neighbor-changes
> neighbor 24.1.3.3 remote-as 100
> neighbor 24.1.3.3 update-source Loopback0
> !
> address-family ipv4
> neighbor 24.1.3.3 activate
> no auto-summary
> no synchronization
> exit-address-family
> !
> address-family vpnv4
> neighbor 24.1.3.3 activate
> neighbor 24.1.3.3 send-community extended
> exit-address-family
> !
> address-family ipv4 vrf CCIE_SITE_1
> redistribute ospf 1 vrf CCIE_SITE_1 match internal external 1 external 2
> no auto-summary
> no synchronization
> exit-address-family
> R2#sh run | sec ospf
> router ospf 1 vrf CCIE_SITE_1
> router-id 10.1.28.2
> domain-id 0.0.0.200
> log-adjacency-changes
> redistribute bgp 100 subnets
> network 10.1.28.0 0.0.0.255 area 0
> redistribute ospf 1 vrf CCIE_SITE_1 match internal external 1 external 2
> R2#
>
> R2#show ip route vrf CCIE_SITE_1 51.51.51.51
> Routing entry for 51.51.51.51/32
> Known via "ospf 1", distance 110, metric 20
> Tag Complete, Path Length == 1, AS 200, , type extern 2, forward metric 2
> Redistributing via bgp 100
> Advertised by bgp 100 match internal external 1 & 2
> Last update from 10.1.28.8 on FastEthernet0/0, 00:20:14 ago
> Routing Descriptor Blocks:
> * 10.1.28.8, from 10.1.18.1, 00:20:14 ago, via FastEthernet0/0
> Route metric is 20, traffic share count is 1
> Route tag 3489661128
>
> R2#show ip bgp vp all 51.51.51.51
> BGP routing table entry for 1000:1:51.51.51.51/32, version 69
> Paths: (1 available, best #1, table CCIE_SITE_1)
> Advertised to update-groups:
> 1
> 200
> 10.1.28.8 from 0.0.0.0 (24.1.2.2)
> Origin *IGP*, metric 20, localpref 100, weight 32768, valid, sourced, best
> Extended Community: RT:100:1 OSPF DOMAIN ID:0x0005:0x000000C80200
> OSPF RT:0.0.0.0:5:1 OSPF ROUTER ID:10.1.28.2:1281,
> mpls labels in/out 34/nolabel
> R2#
>
> Regards,
> Nagendra
>
>
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Received on Fri Jun 26 2009 - 12:12:37 ART