Configure OSPF publish aggregation routing
1.13.3 configure OSPF publish aggregation routing
Networking requirements
Switch An and Switch B are located in AS 200. OSPF is used as the IGP protocol in AS 200.
Switch C, Switch D, and Switch E are located within AS 100. OSPF is used as the IGP protocol within AS 100.
Establish an EBGP connection between Switch B and Switch C, configure BGP to introduce OSPF and directly connected routes, and configure OSPF
The process introduces BGP routing.
To reduce the size of the routing table of Switch A, configure route aggregation on Switch B to publish only the aggregated routes
10.0.0.0/8 .
As shown in the figure:
Configuration step
(1) configure the IP address of the interface (abbreviated)
(2) configure OSPF to configure Switch A.
System-view
[SwitchA] router id 11.2.1.2
[SwitchA] ospf
[SwitchA-ospf-1] area 0
[SwitchA-ospf-1-area-0.0.0.0] network 11.2.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0] quit
[SwitchA-ospf-1] quit
Configure Switch B.
System-view
[SwitchB] router id 11.2.1.1
[SwitchB] ospf
[SwitchB-ospf-1] area 0
[SwitchB-ospf-1-area-0.0.0.0] network 11.2.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] quit
[SwitchB-ospf-1] quit
Configure Switch C.
System-view
[SwitchC] router id 11.1.1.2
[SwitchC] ospf
[SwitchC-ospf-1] area 0
[SwitchC-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] network 10.2.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] quit
[SwitchC-ospf-1] quit
Configure Switch D.
System-view
[SwitchD] router id 10.3.1.1
[SwitchD] ospf
[SwitchD-ospf-1] area 0
[SwitchD-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0] network 10.3.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0] quit
Configure Switch E.
System-view
[SwitchE] router id 10.4.1.1
[SwitchE] ospf
[SwitchE-ospf-1] area 0
[SwitchE-ospf-1-area-0.0.0.0] network 10.2.1.0 0.0.0.255
[SwitchE-ospf-1-area-0.0.0.0] network 10.4.1.0 0.0.0.255
[SwitchE-ospf-1-area-0.0.0.0] quit
[SwitchE-ospf-1] quit
(3) configure BGP, introduce OSPF and directly connected routes
Configure Switch B.
[SwitchB] bgp 200
[SwitchB-bgp] peer 11.1.1.2 as 100
[SwitchB-bgp] address-family ipv4 unicast
[SwitchB-bgp-ipv4] import-route ospf
[SwitchB-bgp-ipv4] import-route direct
[SwitchB-bgp-ipv4] peer 11.1.1.2 enable # be careful not to lose this sentence
[SwitchB-bgp-ipv4] quit
[SwitchB-bgp] quit
Configure Switch C.
[SwitchC] bgp 100
[SwitchC-bgp] peer 11.1.1.1 as 200
[SwitchC-bgp] address-family ipv4 unicast
[SwitchC-bgp-ipv4] import-route ospf
[SwitchC-bgp-ipv4] import-route direct
[SwitchC-bgp-ipv4] peer 11.1.1.1 enable # be careful not to lose this sentence
[SwitchC-bgp-ipv4] quit
[SwitchC-bgp] quit
(4) configure OSPF to introduce BGP routing on Switch B and Switch C
Configure OSPF to introduce BGP routing on Switch B.
[SwitchB] ospf
[SwitchB-ospf-1] import-route bgp
Configure OSPF to introduce BGP routing on Switch C.
[SwitchC] ospf
[SwitchC-ospf-1] import-route bgp
View the routing table information for SwitchA.
[SwitchA] display ip routing-table
(5) configure route aggregation on Switch B to publish only the aggregate route 10.0.0.0amp8.
[SwitchB-ospf-1] asbr-summary 10.0.0.0 8
View the routing table information for Switch A.
[SwitchA] display ip routing-table
