Re: redistribution from OSPF to BGP failure

thanks Brain,

let me test that out ...

On Wed, Sep 25, 2013 at 5:12 AM, Brian Dennis <bdennis_at_ine.com> wrote:

> By default only OSPF internal routes will be redistributed into BGP. You
> need
> to add "match internal external" to the redistribution.
>
> As per RFC 1403:
> OSPF external routes of type 1 and type 2 MUST never be exported into BGP
> unless they are explicitly configured.
>
> Redistribution of OSPF Internal and External Routes into BGP
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800943c5.
> shtml#redistributionofospfinternalandexternalroutesintobgp
>
>
> --
> Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
> bdennis_at_ine.com<mailto:bdennis_at_ine.com>
>
> INE, Inc.
> http://www.INE.com
>
>
> On 09/24/2013 06:55 PM, Joseph L. Brunner wrote:
>
> Team,
>
> any idea why this is happening?
>
> I am running AS 1 in my core, and that is peering with the provider AS 500.
>
> those routes are being redistributed from BGP to OSPF on CORE 1 (from AS 1
> to
> ospf process 1)
>
> down on access1 the now ospf route 1.1.1.1 is not being redistributed into
> BGP
> on Access1 which uses BGP AS 65000 to get to an MPLS provider (dont ask why
> Access1 had to be a different AS than CORE1 & 2)
>
> OSPF Internal routes ARE being redistributed.
>
> Question: Is there some mechanism now that will NOT allow an external ospf
> route to be redistributed into BGP from OSPF?
>
> ACCESS1#show ip route 1.1.1.1
> Routing entry for 1.1.1.0/24
> Known via "ospf 1", distance 110, metric 3
> Tag 600, type extern 1
> Redistributing via bgp 65001
> Last update from 172.16.60.1 on Vlan60, 00:08:38 ago
> Routing Descriptor Blocks:
> 172.16.60.1, from 25.25.25.25, 00:08:38 ago, via Vlan60
> Route metric is 3, traffic share count is 1
> Route tag 600
> * 172.16.50.1, from 3.3.3.3, 00:08:38 ago, via Vlan50
> Route metric is 3, traffic share count is 1
> Route tag 500
>
>
> ACCESS1#sh ip route 3.3.3.3
> Routing entry for 3.3.3.3/32
> Known via "ospf 1", distance 110, metric 2, type intra area
> Redistributing via bgp 65001
> Advertised by bgp 65001
> Last update from 172.16.50.1 on Vlan50, 00:08:49 ago
> Routing Descriptor Blocks:
> * 172.16.50.1, from 3.3.3.3, 00:08:49 ago, via Vlan50
> Route metric is 2, traffic share count is 1
>
> ACCESS1#show ip bgp 1.1.1.0
> % Network not in table
>
> ACCESS1#show ip bgp 3.3.3.3
> BGP routing table entry for 3.3.3.3/32, version 9
> Paths: (1 available, best #1, table Default-IP-Routing-Table)
> Advertised to update-groups:
> 1
> Local
> 172.16.50.1 from 0.0.0.0 (8.8.8.8)
> Origin incomplete, metric 2, localpref 100, weight 32768, valid,
> sourced, best
>
> my config on access1
>
> ACCESS1#show run | b router ospf
> router ospf 1
> log-adjacency-changes
> redistribute bgp 65001 subnets
> network 172.16.13.1 0.0.0.0 area 0
> network 172.16.50.2 0.0.0.0 area 0
> network 172.16.60.2 0.0.0.0 area 0
> network 172.18.2.2 0.0.0.0 area 0
> !
> router bgp 65001
> no synchronization
> bgp log-neighbor-changes
> aggregate-address 172.16.0.0 255.255.0.0 summary-only
> aggregate-address 172.19.0.0 255.255.0.0 summary-only
> redistribute ospf 1
> neighbor 172.18.2.1 remote-as 65000
> neighbor 172.18.2.1 allowas-in
> neighbor 172.18.2.1 route-map to-mpls out
> no auto-summary
>
>
> thanks!
>
> -Joe
> #19366
>
>
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Received on Wed Sep 25 2013 - 21:48:30 ART