Setting DN bit during MP-BGP redistribution into OSPF

The DN (Down) bit is set by default to prevent looping, when multiprotocol BGP (MP-BGP) routes are redistributed into OSPF. This is specific for type3, type5, and type7 link state advertisements (LSA). The DN bit set check can be disabled using the vrf-lite-capability command in the OSPF router configuration mode. When done, the LSAs get advertised to OSPF neighbors and the router that receives this LSA information can use it for routing calculations irrespective of the DN bit set status.

1. Navigate into the Privileged Exec mode.
   

   SLX #configure terminal
   SLX (config) #

2. Navigate into OSPF router config mode.
   

   SLX (config)#router ospf vrf T1
   SLX (config-router-ospf-vrf-T1)#

3. Execute the vrf-lite-capability command.
   

   SLX (config-router-ospf-vrf-T1)#vrf-lite-capability

   DN bit checks are disabled.