Lab 109 - BGP Aggregation with Unsuppress-Map

Lab 109 - BGP Aggregation with Unsuppress-Map
Di Posting Oleh : Simple Learning
Kategori : BGP Core Technologies Routing

Prerequisites: CCNP level skills.

Note!
BGP configuration based on Lab 108 (R4 loopbacks already advertised and aggregated).

Topology

Pic. 1 - Topology Diagram.
Icons designed by: Andrzej Szoblik - http://www.newo.pl

Task 1
R4 is advertising the aggregate 40.0.0.0/14. Configure R4 so that it also advertises more specific prefixes as follows:
  • 40.3.0.0/16 towards R1
  • 40.1.0.0/16 towards R2
Solution

Task 1
R4 is advertising the aggregate 40.0.0.0/14. Configure R4 so that it also advertises more specific prefixes as follows:
  • 40.3.0.0/16 towards R1
  • 40.1.0.0/16 towards R2

Pic. 2 - Suppressed Routes on R4.

Pic. 3 - BGP Table on R5.

R4 Configuration:
!
ip prefix-list NET_40 seq 5 permit 40.0.0.0/8 le 16
ip prefix-list NET_44 seq 5 permit 44.4.0.0/16 le 19
ip prefix-list PFX_UNSUPPRESS_TO_R1 seq 5 permit 40.3.0.0/16
ip prefix-list PFX_UNSUPPRESS_TO_R2 seq 5 permit 40.1.0.0/16
!
route-map CONN_TO_BGP permit 10
 match ip address prefix-list NET_40
!
route-map CONN_TO_BGP permit 20
 match ip address prefix-list NET_44
!
route-map UNSUPPRESS_TO_R2 permit 10
 match ip address prefix-list PFX_UNSUPPRESS_TO_R2
!
route-map UNSUPPRESS_TO_R1 permit 10
 match ip address prefix-list PFX_UNSUPPRESS_TO_R1
!
router bgp 40
 no synchronization
 bgp router-id 172.16.104.4
 bgp log-neighbor-changes
 network 172.16.104.0 mask 255.255.255.0
 aggregate-address 40.0.0.0 255.252.0.0 summary-only
 aggregate-address 44.4.0.0 255.255.128.0
 redistribute connected route-map CONN_TO_BGP
 neighbor 10.1.14.1 remote-as 10
 neighbor 10.1.14.1 unsuppress-map UNSUPPRESS_TO_R1
 neighbor 10.1.24.2 remote-as 20
 neighbor 10.1.24.2 unsuppress-map UNSUPPRESS_TO_R2
 no auto-summary
!

Notice!
Applying this change does not require 'clear ip bgp * out' but it takes a moment to unsuppress the prefixes.

Verification:
Pic. 4 - BGP Table on R1 Received
from the Neighbor AS 40.
Notice!
R1 receives the aggregate route 40.0.0./14 as well as unsuppressed route 40.3.0.0/16.

Pic. 5 - BGP Table on R2 Received
from the Neighbor AS 40.
Notice!
R2 receives the aggregate route 40.0.0./14 as well as unsuppressed route 40.1.0.0/16.

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