In this lab, I will demonstrate how to configure a summary address on an Area Border Router (ABR) in OSPF. This process, also called route aggregation, allows the ABR to consolidate multiple routes into a single advertisement, reducing routing table entries and improving network efficiency.
Why Use a Summary Address?
- Reduce Routing Table Size: By summarizing multiple routes, we simplify routing tables on downstream routers.
- Improve Performance: Smaller routing tables mean reduced memory and CPU usage on routers.
- Simplify Management: Consolidated routes make networks easier to troubleshoot and optimize.
Scenario
- Router 1 (R1): Located in Area 0.
- Router 2 (R2): Acts as the ABR between Area 0 and Area 1.
- Router 3 (R3): Located in Area 1, with multiple loopback interfaces.
Objective:
- Configure four loopback interfaces on R3 (
172.16.1.1/32,172.16.2.1/32,172.16.3.1/32,172.16.4.1/32). - Advertise these networks into Area 1.
- Configure a summary address (
172.16.0.0/21) on R2 to consolidate these routes before advertising them to R1.
Lab Steps
Step 1: Create Loopback Interfaces on R3
On Router 3 (R3), create and configure four loopback interfaces.
R3# edit interfaces loopback
R3# set lo0 unit 1 family inet address 172.16.1.1/32
R3# set lo0 unit 2 family inet address 172.16.2.1/32
R3# set lo0 unit 3 family inet address 172.16.3.1/32
R3# set lo0 unit 4 family inet address 172.16.4.1/32
R3# commit
Step 2: Advertise Loopback Interfaces in OSPF
Add the loopback interfaces into OSPF Area 1 on Router 3 (R3).
R3# edit protocols ospf area 1
R3# set interface lo0.1
R3# set interface lo0.2
R3# set interface lo0.3
R3# set interface lo0.4
R3# commit
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