routing between bgp ASNs

[DragosMariusAvram66611]

Hello everyone, 

I have the network diagram as follows. 

As r-1 advertise its loopback 0  into BGP, i need this prefix to be reachable from r-5 and r-6. Same for r-2.

now, i would like that ASN 1.2 to see only those 2 prefixes coming from ASN 1.1.

Now i know that BGP needs full connectivity but i also would like not to extend IGP  boundaries more.

Can you guys explain me a feasible way to achieve this?

I can ping r1 loopback from r4 only from the directly connected interfaces to r3.

Thank you in advance guys.

[Jon Marshall]

Can you post a

sh ip bgp

from r-4 and r-5. 

Jon

[DragosMariusAvram66611]

     Network          Next Hop            Metric LocPrf Weight Path
 *>   1.1.1.1/32       20.1.1.3                               0 65537 i
 *m                    192.168.1.191                          0 65537 i
 *>   1.1.1.2/32       20.1.1.3                               0 65537 i
 *m                    192.168.1.191                          0 65537 i
 r>i  1.1.1.5/32       1.1.1.5                  0    100      0 i
 r>i  1.1.1.6/32       1.1.1.6                  0    100      0 i
r4#

     Network          Next Hop            Metric LocPrf Weight Path
 *>i  1.1.1.1/32       1.1.1.4                  0    100      0 65537 i
 *>i  1.1.1.2/32       1.1.1.4                  0    100      0 65537 i
 *>   1.1.1.5/32       0.0.0.0                  0         32768 i
r5#

[Jon Marshall · Accepted solution]

The routes are there, can you post a traceroute from r-5 using loopback as source IP to r-1 or r-2 ? 

Jon

[DragosMariusAvram66611]

jon indeed you are a legend. 

you opened my eyes and made me realize my stupidity, and that the traffic i was generating was sourced from outgoing interface of r5 not from loopback as desired. and ofc those routes are not advertised into bgp,  silly me....

god bless you.

[Jon Marshall]

No problem, glad you got it sorted. 

Jon

[paul.driver]

Hello

From R3
Possibly advertise a default route into opsf for both r1-2 and then advertise OSPF or just OSPF specific routes into bgp towards r4-5-6

• Example:
  

  ip prefix-list 10 permit 1.1.1.1/32
  
  ip prefix-list10  permit 1.1.1.2/32
  
  route-map OSPF_PF
  
  match ip address prefix-list 10
  
  router ospf 1
  
  default-information originate always
  
  router bgp 65537
  
  redistribute ospf 1 match internal external 
  or
  
  redistribute ospf 1 route-map OSPF_PF match internal  external