Re: redistribution from OSPF to BGP failure

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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