OSPF summary route

1.13.3 Configuring OSPF summary route

1. Networking Requirements
   • • Switch A and Switch B in AS 200, AS 200 using the OSPF as the IGP.
   • • Switch C, Switch D and Switch E located within AS 100, AS 100 using the OSPF as the IGP.
   • • Switch B and Switch C EBGP connection, configure OSPF and BGP introduction of direct routes, configure OSPF
   process import BGP routes.
   • • In order to reduce routing table size Switch A and Switch B disposed on the route summarization, only the summary route
   10.0.0.0/8.

3. Configuration Step
   (1) the IP address of an interface (omitted)
   (2) Configuration OSPF

   Configure Switch A.

   <SwitchA> 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.

   <SwitchB> 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.

   <SwitchC> 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

   Configuration Switch D.

   <SwitchD> 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

   Configuration Switch E.

   <SwitchE> 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) arranged BGP, OSPF, and the introduction of direct 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 #注意不要少了这句
[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 #注意不要少了这句
[SwitchC-bgp-ipv4] quit
[SwitchC-bgp] quit

(4) arranged OSPF into BGP routes on Switch B and Switch C

OSPF configuration introduced a BGP route on Switch B.

[SwitchB] ospf
[SwitchB-ospf-1] import-route bgp

OSPF configuration introduced a BGP route on Switch C.

[SwitchC] ospf
[SwitchC-ospf-1] import-route bgp

View the routing table of SwitchA.

[SwitchA] display ip routing-table

(5) arranged on the route aggregation Switch B, only the summary route 10.0.0.0/8.
[SwitchB-ospf-1] asbr -summary 10.0.0.0 8

Check the routing table of Switch A.

[SwitchA] display ip routing-table