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510
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Helpful
4
Replies

OSPF routes showing in database, but not getting installed in FIB

studentcisco52
Level 1
Level 1

Hi team,

 

The topology is like PE1-- (ibgp) --> PE2 ( bgp --> OSPF redistribution ) --> CE 2.

 

All the devices are IOS XR nodes.

The route is available in PE2 in iBGP and is getting redistributed to OSPF. 
In CE1 , we could see the route in database, nut not in FIB.

kindly help on the same please

 

Prefix : 192.168.153.227/32

 

PE2 Logs




--------------------------------
router ospf 2
vrf test
router-id 1.1.1.1
bfd fast-detect
redistribute bgp 138384 metric-type 1 route-policy BGP_TO_OSPF
address-family ipv4 unicast
area 1
network point-to-point
interface TenGigE0/0/0/3.2511
!
--------------------------------------------------

show ospf vrf test routes external 192.168.153.227/32



External Topology Table for ospf 2, VRF mobility_data1 with ID 192.168.153.125

Codes: O - Intra area, O IA - Inter area
O E1 - External type 1, O E2 - External type 2
O N1 - NSSA external type 1, O N2 - NSSA external type 2
C - connected, S - static, L - local, R - RIP, B - BGP
i L1 - IS-IS level-1, i L2 - IS-IS level-2, i ia - IS-IS inter area
E D - EIGRP, E X - EIGRP external
D - DAGR, A - Subscriber

B 192.168.153.227/32, metric 2
0.0.0.0, redistributed from bgp xxxxx, via NULLIFHNDL
RT: 1.0.0.0:1:0 Router ID:192.168.153.123



---------------------------------------------------

CE2Logs

---------------

router ospf 2
vrf test
router-id 192.168.153.127
bfd fast-detect
address-family ipv4 unicast
area 1
network point-to-point
interface Loopback15
passive enable
!
interface TenGigE0/0/0/23.2511




----------------------------

show ospf vrf test routes 192.168.153.227/32
---------------------------------------




show ospf vrf mobility_data1 database summary 192.168.153.227




OSPF Router with ID (192.168.153.127) (Process ID 2, VRF test)

Summary Net Link States (Area 1)

LS age: 880
Options: (No TOS-capability, DC, DN)
LS Type: Summary Links (Network)
Link State ID: 192.168.153.227 (Summary Network Number)
Advertising Router: 192.168.153.125
LS Seq Number: 80000003
Checksum: 0xafa1
Length: 28
Network Mask: /32
TOS: 0 Metric: 2





 

 

2 Accepted Solutions

Accepted Solutions

Capabillity vrf lite 

You need to add this command under ce opsf 

View solution in original post

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello @studentcisco52 ,

@MHM Cisco World  is right

 

>> Options: (No TOS-capability, DC, DN)

 

the DN bit is set meaning the OSPF LSA comes from redistribution from MP BGP in order to have the LSA accepted and used you need the

capability vrf-lite

that allows the multi VRF CE device to accept routes that have the DN bit set.

 

On the other hand the DN bit is also an elegant way to control route propagation and to avoid re-enjction in the backbone.

 

Hope to help

Giuseppe

 

View solution in original post

4 Replies 4

Capabillity vrf lite 

You need to add this command under ce opsf 

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello @studentcisco52 ,

@MHM Cisco World  is right

 

>> Options: (No TOS-capability, DC, DN)

 

the DN bit is set meaning the OSPF LSA comes from redistribution from MP BGP in order to have the LSA accepted and used you need the

capability vrf-lite

that allows the multi VRF CE device to accept routes that have the DN bit set.

 

On the other hand the DN bit is also an elegant way to control route propagation and to avoid re-enjction in the backbone.

 

Hope to help

Giuseppe

 

studentcisco52
Level 1
Level 1

@Giuseppe Larosa  @MHM Cisco World  :

Thanks for the quick support and guidance ...

Now the issue is resolved 

You are so so Welcome 

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