Di Posting Oleh : Simple Learning
Kategori : HCv1.0 Intermediate OSPF
Pic. 1 - Topology Diagram.
Task 1
On R1, R3, and R4 disable pseudo-broadcast on Frame-Relay interfaces.
Task 2
Reconfigure OSPF on R1, R3, and R4 to use OSPF point-to-multipoint non-broadcast mode. Ensure OSPF domain has full connectivity.
Questions
Task 2
Reconfigure OSPF on R1, R3, and R4 to use OSPF point-to-multipoint non-broadcast mode. Ensure OSPF domain has full connectivity.
Questions
- What happened when you have removed 'broadcast' keyword in Task 1 as far as OSPF communication?
- What is/are the difference(s) between OSPF point-to-multipoint and point-to-multipoint non-broadcast?
- Is the mode used in this lab Cisco proprietary or RFC standard?
Lab Solution
Solution configuration below:
https://docs.google.com/file/d/0BwE5C95tpjZOMnhPdmFuMUJ2b3c/edit?usp=sharing
Task 1
On R1, R3, and R4 disable pseudo-broadcast on Frame-Relay interfaces.R1 Config:
!
interface Serial0/0
frame-relay map ip 172.16.0.3 103
frame-relay map ip 172.16.0.4 104
!
R3 Config:
!
interface Serial0/0
frame-relay map ip 172.16.0.1 301
!
R4 Config:
!
interface Serial0/0
frame-relay map ip 172.16.0.1 401
!
What You Should See
Pic. 2.
Pic. 3.
Reconfigure OSPF on R1, R3, and R4 to use OSPF point-to-multipoint non-broadcast mode. Ensure OSPF domain has full connectivity.
R1 Config:
!
interface Serial0/0
ip ospf network point-to-multipoint non-broadcast
!
router ospf 1
neighbor 172.16.0.4
neighbor 172.16.0.3
!
R3 Config:
!
interface Serial0/0
ip ospf network point-to-multipoint non-broadcast
!
R4 Config:
!
interface Serial0/0
ip ospf network point-to-multipoint non-broadcast
!
What You Should See
Pic. 4.
Study Drill
If you cannot use pseudo-broadcast (for instance, this is an exam stipulation)on NBMA links (or there is no support for), you can use OSPF point-to-multipoint non-broadcast mode. This will behave just like OSPF point-to-multipoint (treats connections as point-to point, no DR/BDR election).
This mode of OSPF is Cisco proprietary. The timers are 30/120 seconds (hello, dead). Since this mode does not assume pseudo broadcast/multicast support, it requires the 'neighbor' statement in the configuration on R1 (the hub router). The spoke routers will respond using unicast upon receiving unicast hello. As for the next-hop address, this option also behaves like OSPF point-to-multipoint mode.
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