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Beginner

Routes learned from EIGRP not showing in BGP routing table

Basic-MPLS.jpg

This is basic MPLS-VPN LaB i am practicing on GNS3. topology Diagram is attached.

I am unable to ping from PE(R-2) to PE(R-4). routes are showing in neighbor table of BGP but not in routing table.

Please help. I am attaching config files of PE(R2) , PE (R4) and P (R3) routers. 

#bgp #Eigrp #MPLS #MPLSVPN #MP-BGP

1 ACCEPTED SOLUTION

Accepted Solutions
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Hall of Fame Master

Hello @luqman_khalid ,

in order to build a working configuration in the MPLS forwarding plane you need ip ospf network point-to-point to advertise in OSPF a /24 loopback address. Otherwise there is a mismatch between  IGP that advertises a /32 and LDP that advertises a /24 and instead of POP action you get show mpls forwarding action UNTAGGEd this breaks the MPLS L3 VPN connectivity.

 

interface Loopback0

 ip address 4.4.4.4 255.255.255.0
ip ospf network point-to-point !

 

Do the the same on R2 PE and on P nodes this is  a specific issue of OSPF when dealing with loopback interfaces with subnet masks different then 255.255.255.255

 

Hope to help

Giuseppe

View solution in original post

5 REPLIES 5
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VIP Expert

Hello,

 

at first glance, you are missing the 'bgp redistribute-internal' command under the BGP process on R2 and R4...

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Still not working.

same result. is there any limitation of GNS ?

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Hello,

 

post the full configs of all 5 routers so we can lab this...

Highlighted
Hall of Fame Master

Hello @luqman_khalid ,

in order to build a working configuration in the MPLS forwarding plane you need ip ospf network point-to-point to advertise in OSPF a /24 loopback address. Otherwise there is a mismatch between  IGP that advertises a /32 and LDP that advertises a /24 and instead of POP action you get show mpls forwarding action UNTAGGEd this breaks the MPLS L3 VPN connectivity.

 

interface Loopback0

 ip address 4.4.4.4 255.255.255.0
ip ospf network point-to-point !

 

Do the the same on R2 PE and on P nodes this is  a specific issue of OSPF when dealing with loopback interfaces with subnet masks different then 255.255.255.255

 

Hope to help

Giuseppe

View solution in original post

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Thank you dear , it worked by two different methods.

1: converting Loopback address from /24 to /32.

2: solution proposed by You.

@Giuseppe Larosa