Section 2.0: Routing Configuration

2.1. OSPF

  1. Configure OSPF areas as shown in Figure 6-3.

  2. Configure MD5 authentication for all areas.

  3. Hardcode OSPF router IDs (see the example following item 4).

  4. Configure an OSPF virtual link between R2 and R4 using MD5 authentication, as demonstrated in the following example:

    hostname r2
!
router ospf 110
 router-id 2.2.2.2
 log-adjacency-changes
 area 0 authentication message-digest
								area 1 authentication message-digest
								area 1 virtual-link 4.4.4.4 message-digest-key 1 md5 7 02050D480809
 network 164.15.4.0 0.0.0.255 area 0
 network 165.1.2.0 0.0.0.3 area 1
 network 165.1.2.8 0.0.0.3 area 1
!

r2#show ip ospf virtual-links
								Virtual Link OSPF_VL0 to router 4.4.4.4 is up Run as demand circuit DoNotAge LSA allowed. Transit ...

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