Di Posting Oleh : Simple Learning
Kategori : HCv1.0 Intermediate OSPF
Pic. 1 - Topology Diagram.
Task 1
Remove OSPF MD5 authentication between R1 and R2 (look at configuration in previous lab). Do not change anything else on R1. Ensure R1 and R2 stay OSPF neighbors.
Questions
Questions
- What is OSPF Null authentication?
Study Drill
Consider the configuration on R1:
Lab Solution
Consider the configuration on R1:
Pic. 2.
The task stipulates that we can remove OSPF configuration from R1's FastEthernet, but we CAN'T change anything in OSPF routing context (we can't remove 'area 0 authentication).
Since FastEtherent0/0 on R1 is enabled in OSPF area 0, the only option we have is to apply OSPF null authentication.
Solution configuration below:
https://docs.google.com/file/d/0BwE5C95tpjZOWWJDT2dLWWhoZDg/edit?usp=sharing
Task 1
Remove OSPF MD5 authentication between R1 and R2 (look at configuration in previous lab). Do not change anything else on R1. Ensure R1 and R2 stay OSPF neighbors.R1 Config:
!
interface FastEthernet0/0
no ip ospf message-digest-key 1 md5 G33K
no ip ospf message-digest-key 2 md5 CISCO123
ip ospf authentication null
!
R2 Config:
!
interface FastEthernet0/0
no ip ospf authentication message-digest
no ip ospf message-digest-key 1 md5 G33K
!
Pic. 3.
Recall the order of operations in terms of OSPF: interface-based authentication overrides the routing context one. Also, if authentication is enabled in the OSPF routing context for a specific area, ALL interfaces in this authenticated area will send their 'hello' packets with the authentication method/data by default.
In the later labs we will use OSPF Virtual Link configuration. Which area will a VL belong to? How area authentication will affect VL?
� Jarek Rek 2013
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