MPLS vpnv4 l3 network I am not getting routes from CE Router

[R Manjunatha]

Hi,

I created the VRF in PE router R38 AS5610 and similarly in PE router R35 AS 6520 and I configured the MP-BGP between the routes.

PE -R38 to CE-R76----- PE-R35 to CE-R82----

configured static route and redistributed to BGP

I am not getting the BGP route (82.82.82.0) from PE-R38

R38#sh ip route vrf F-1

Routing Table: F-1
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.10.76.0/24 is directly connected, Ethernet0/0
L 10.10.76.2/32 is directly connected, Ethernet0/0
76.0.0.0/24 is subnetted, 1 subnets
S 76.76.76.0 [1/0] via 10.10.76.1
R38

interface Loopback0
ip address 38.38.38.38 255.255.255.255
!
interface Ethernet0/0
vrf forwarding F-1
ip address 10.10.76.2 255.255.255.0
duplex auto
!
interface Ethernet0/1
ip address 10.10.38.1 255.255.255.0
duplex auto
mpls ip
!
interface Ethernet0/2
ip address 10.10.33.1 255.255.255.0
duplex auto
mpls ip
!
interface Ethernet0/3
no ip address
shutdown
duplex auto
!
interface Ethernet1/0
no ip address
shutdown
duplex auto
!
interface Ethernet1/1
no ip address
shutdown
duplex auto
!
interface Ethernet1/2
no ip address
shutdown
duplex auto
!
interface Ethernet1/3
no ip address
shutdown
duplex auto
!
router ospf 1
router-id 37.37.37.37
network 10.10.33.0 0.0.0.255 area 0
network 10.10.38.0 0.0.0.255 area 0
network 37.37.37.0 0.0.0.0 area 0
network 38.38.38.38 0.0.0.0 area 0
!
router bgp 6510
bgp router-id 38.38.38.38
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 75.75.75.75 remote-as 6510
neighbor 75.75.75.75 update-source Loopback0
!
address-family vpnv4
neighbor 75.75.75.75 activate
neighbor 75.75.75.75 send-community extended
neighbor 75.75.75.75 next-hop-self
exit-address-family
!
address-family ipv4 vrf F-1
redistribute connected
redistribute static
exit-address-family
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip route vrf F-1 76.76.76.0 255.255.255.0 10.10.76.1
!
ipv6 ioam timestamp
!
!
mpls ldp router-id Loopback0




R75

interface Loopback0
ip address 75.75.75.75 255.255.255.255
!
interface Ethernet0/0
ip address 10.10.32.2 255.255.255.0
duplex auto
mpls ip
!
interface Ethernet0/1
ip address 10.10.75.1 255.255.255.0
duplex auto
mpls ip
!
interface Ethernet0/2
ip address 10.75.75.1 255.255.255.0
duplex auto
mpls bgp forwarding
!
interface Ethernet0/3
no ip address
shutdown
duplex auto
!
router ospf 1
router-id 75.75.75.75
network 10.10.32.0 0.0.0.255 area 0
network 10.10.75.0 0.0.0.255 area 0
network 75.75.75.75 0.0.0.0 area 0
network 75.75.75.0 0.0.0.255 area 0
!
router bgp 6510
bgp router-id 75.75.75.75
bgp log-neighbor-changes
no bgp default ipv4-unicast
no bgp default route-target filter
neighbor 10.75.75.2 remote-as 6520
neighbor 38.38.38.38 remote-as 6510
neighbor 38.38.38.38 update-source Loopback0
!
address-family vpnv4
neighbor 10.75.75.2 activate
neighbor 10.75.75.2 send-community extended
neighbor 38.38.38.38 activate
neighbor 38.38.38.38 send-community extended
neighbor 38.38.38.38 next-hop-self
exit-address-family
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
!
ipv6 ioam timestamp
!
!
mpls ldp router-id Loopback0



R37

interface Loopback0
ip address 37.37.37.37 255.255.255.255
!
interface Ethernet0/0
ip address 10.10.37.1 255.255.255.0
duplex auto
mpls ip
!
interface Ethernet0/1
ip address 10.10.78.1 255.255.255.0
duplex auto
mpls ip
!
interface Ethernet0/2
ip address 10.75.75.2 255.255.255.0
duplex auto
mpls bgp forwarding
!
interface Ethernet0/3
no ip address
shutdown
duplex auto
!
router ospf 1
router-id 37.37.37.37
network 10.10.37.0 0.0.0.255 area 0
network 10.10.78.0 0.0.0.255 area 0
network 37.37.37.37 0.0.0.0 area 0
!
router bgp 6520
bgp router-id 37.37.37.37
bgp log-neighbor-changes
no bgp default ipv4-unicast
no bgp default route-target filter
neighbor 10.75.75.1 remote-as 6510
neighbor 35.35.35.35 remote-as 6520
neighbor 35.35.35.35 update-source Loopback0
!
address-family vpnv4
neighbor 10.75.75.1 activate
neighbor 10.75.75.1 send-community extended
neighbor 35.35.35.35 activate
neighbor 35.35.35.35 send-community extended
neighbor 35.35.35.35 next-hop-self
exit-address-family
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
!
ipv6 ioam timestamp
!
!
mpls ldp router-id Loopback0




 

R35

interface Loopback0
ip address 35.35.35.35 255.255.255.255
!
interface Ethernet0/0
ip address 10.10.34.2 255.255.255.0
duplex auto
mpls ip
!
interface Ethernet0/1
ip address 10.10.35.1 255.255.255.0
duplex auto
mpls ip
!
interface Ethernet0/2
vrf forwarding F-2
ip address 10.10.82.1 255.255.255.0
duplex auto
!
interface Ethernet0/3
no ip address
shutdown
duplex auto
!
interface Ethernet1/0
no ip address
shutdown
duplex auto
!
interface Ethernet1/1
no ip address
shutdown
duplex auto
!
interface Ethernet1/2
no ip address
shutdown
duplex auto
!
interface Ethernet1/3
no ip address
shutdown
duplex auto
!
router ospf 1
router-id 35.35.35.35
network 10.10.34.0 0.0.0.255 area 0
network 10.10.35.0 0.0.0.255 area 0
network 35.35.35.35 0.0.0.0 area 0
!
router bgp 6520
bgp router-id 35.35.35.35
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 37.37.37.37 remote-as 6520
neighbor 37.37.37.37 update-source Loopback0
!
address-family vpnv4
neighbor 37.37.37.37 activate
neighbor 37.37.37.37 send-community extended
neighbor 37.37.37.37 next-hop-self
exit-address-family
!
address-family ipv4 vrf F-2
redistribute connected
redistribute static
exit-address-family
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip route vrf F-2 82.82.82.0 255.255.255.0 10.10.82.2
!
ipv6 ioam timestamp
!
!
mpls ldp router-id Loopback0
!
control-plane

[Harold Ritter]

Hi @R Manjunatha ,

It probably has to do with the import/export policy.

Can you share the

show runn vrf output from R38 and R35.

Regards,

[MHM Cisco World]

in R38

router ospf 1
router-id 37.37.37.37 <<- OSPF dual router-ID 
network 10.10.33.0 0.0.0.255 area 0
network 10.10.38.0 0.0.0.255 area 0
network 37.37.37.0 0.0.0.0 area 0 <<-???
network 38.38.38.38 0.0.0.0 area 0

also as @Harold Ritter  mention the VRF route-target import/export must config 

[Harold Ritter]

Hi @MHM Cisco World ,

The fact that R37 and R38 share the same router-id would be an issue if they were both part of the same AS, but they are not so it shouldn't matter.

Regards,

[R Manjunatha]

 it's a typo error, Anyway, I change the router -ID

vrf details for R38 and R35.

R35(config-vrf)#do sh run vrf
Building configuration...

Current configuration : 284 bytes
vrf definition F-2
rd 100:1
route-target export 100:1
route-target import 100:1
!
address-family ipv4
exit-address-family
!
!
interface Ethernet0/2
vrf forwarding F-2
ip address 10.10.82.1 255.255.255.0
duplex auto
!
ip route vrf F-2 82.82.82.0 255.255.255.0 10.10.82.2
end

R38#sh run vrf
Building configuration...

Current configuration : 284 bytes
vrf definition F-1
rd 100:1
route-target export 100:1
route-target import 100:1
!
address-family ipv4
exit-address-family
!
!
interface Ethernet0/0
vrf forwarding F-1
ip address 10.10.76.2 255.255.255.0
duplex auto
!
ip route vrf F-1 76.76.76.0 255.255.255.0 10.10.76.1
end

R38#

[Harold Ritter]

Hi @R Manjunatha ,

The import/export looks good.

Can you provide the following commands output from R75 and R37:

show bgp vpnv4 uni all summ

show bgp vpnv4 uni all

Regards,

[MHM Cisco World]

When you change router-id 

You need to clear ip ospf process to take effect 

[R Manjunatha]

Yes. Default it will ask after changing router-ID and I have done it.

[R Manjunatha]

Hi,

Please find the output from R75 and R37 

R75#show bgp vpnv4 uni all summ
BGP router identifier 75.75.75.75, local AS number 6510
BGP table version is 1, main routing table version 1

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.75.75.2 4 6520 7 7 1 0 0 00:03:54 0
38.38.38.38 4 6510 6 7 1 0 0 00:03:38 0

R75#show bgp vpnv4 unicast all

R37#show bgp vpnv4 uni all summ
BGP router identifier 37.37.37.37, local AS number 6520
BGP table version is 1, main routing table version 1

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.75.75.1 4 6510 8 8 1 0 0 00:05:19 0
35.35.35.35 4 6520 8 8 1 0 0 00:04:03 0

R37#show bgp vpnv4 uni all
R37#

[R Manjunatha]

Hi

I configured the

no BGP default ipv4-unicast 

on both the routers is there any issue with that?

[Harold Ritter]

Hi @R Manjunatha ,

This command just instructs BGP not to activate

address-family ipv4 uni

by default, which is what you want if you are strictly configuring VPNv4.

Regards,

[Harold Ritter]

Hi @R Manjunatha ,

R37 and R75 are not receiving any routes from R38 and R35.

Can you please enter the following configuration:

R38:

router bgp 6510

address-family ipv4 vrf F-1

redistribute connected

redistribute static

exit-address-family

R35:

router bgp 6520

address-family ipv4 vrf F-2

redistribute connected

redistribute static

exit-address-family

An then "show run vrf" again from both routers.

Regards,

[R Manjunatha]

Hi,

please find the

show run vrf 

for both the routers 

R38#SH RUN VRF
Building configuration...

Current configuration : 402 bytes
vrf definition F-1
rd 100:1
route-target export 100:1
route-target import 100:1
!
address-family ipv4
exit-address-family
!
!
interface Ethernet0/0
vrf forwarding F-1
ip address 10.10.76.2 255.255.255.0
duplex auto
!
router bgp 6510
!
address-family ipv4 vrf F-1
redistribute connected
redistribute static
exit-address-family
!
ip route vrf F-1 76.76.76.0 255.255.255.0 10.10.76.1
end

R35(config)#do sh run vrf
Building configuration...

Current configuration : 402 bytes
vrf definition F-2
rd 100:1
route-target export 100:1
route-target import 100:1
!
address-family ipv4
exit-address-family
!
!
interface Ethernet0/2
vrf forwarding F-2
ip address 10.10.82.1 255.255.255.0
duplex auto
!
router bgp 6520
!
address-family ipv4 vrf F-2
redistribute connected
redistribute static
exit-address-family
!
ip route vrf F-2 82.82.82.0 255.255.255.0 10.10.82.2
end

[Harold Ritter]

Hi @R Manjunatha ,

It should work now. Can you please check.

When you posted the

sh runn vrf

before, you were missing the

address-family ipv4 vrf F-1

and

address-family ipv4 vrf F-2

, which would explain why the VRF routes were not propagated.
Regards,

[MHM Cisco World]

I run lab and I success get connect prefix 

no bgp default route-target filter <<- 

remove this command and add it again 
then clear

 ip bgp 6510 / 6520