OSPF Network Types, Virtual Links, Summarization and Authentication MegaLab!!

https://www.dropbox.com/sh/lvjjhe5q6xmtjx9/pcN2mFYARP

OSPF Special

1. Set up OSPF according to their areas. Make sure Loopback interfaces will not send out multicast hellos while still being advertised into OSPF and is advertised into OSPF as a subnet.

2. Configure Router-ID to be x.x.x.x where x is the router number. i.e. R1’s Router-ID will be 1.1.1.1

3. Makes sure Hello Timers are set to 2 seconds across the board for fast convergence.

4. Area 0, configure it to be OSPF Network non-broadcast. Ensure proper DR setup and full adjacency and connectivity. What other was necess

ary to ensure proper adjacencies?

5. Area 24 configure it to be OSPF Network Point-to-point. Ensure full adjacency and connectivity. Can we configure this to be broadcast network?

6. Set up Area 24 as a Totally Stubby Area. Make sure the default route propagated has a cost of 23. Make sure the advertised default from R3 is used by routers in Area 24 as the only default route by changing the cost of the default route.

7. Area 356, first configure it to be a OSPF Network point-to-multipoint broadcast. Ensure proper DR setup and full adjacency and connectivities.

8. Summarize Area 356 Loopback networks at the proper router and make sure it’s propagated throughout the OSPF AS with cost of 356.

9. Add Router 7 onto R6 and set it to Area 67. Then add a virtual link so that R7 knows all routes and the rest of the AS know about R7. Confirm with necessary show commands.

10. Configure EIGRP 1 loopbacks on R7. Redistribute into OSPF with metric 78, type 1. What is R1’smetric to reach EIGRP loopbacks on R7? What would those metrics be if the summary was injected into OSPF as type 2?

11. Staying on R1’s CLI only, add up the metric to reach R7’s loopback interface hop by hop. i.e.

___ Advertised Cost by ASBR

___ Cost to reach ASBR

___ Cost to ABR

___ Other Costs

This metric should match the metric in the routing table. What if EIGRP was redistributed into OSPF as a type-2 metric? What would be the metric in the routing table? What would be the forwarding metric?

11. Summarize EIGRP 1’s loopbacks into OSPF at the appropriate router. Configure Area 67 as a Totally NSSA.

12. Configure MD5 authentication on Virtual Link, Area 0, Area 24 and Area 356. Use passwords: cisco, cisco0, cisco24, cisco356 respectively in each area.

13. Add Loop 3 – 172.16.1.0/24 onto R1 and make sure to inject that as a default route with metric of 1234 without redistributing

CCNP ROUTE Meetup – OSPF over NBMA Network Types Part 01 Youtube Video

I’m still running into issues between R2 and R3.  It was solved immediately by changing Area 0 to Broadcast and adding the appropriate broadcast parameter to the frame-relay map commands.  However, I wonder why Non-Broadcast mode is not working.

I need to capture the debugs where it told me Ignore Timer expired which has something to do with the max-lsa?  Was one of the routers generating excessive LSU/LSA’s

Need further investigation during Part 02.  Which can be on Thursday night or Saturday during the day.

Thanks to Mike Lossman @routedinterface for offering help and knowledge when we ran into trouble near the end of the video.

Suggestions are welcome, @thecmancan or leave your comment below.

Quick Tip!

So I was trying to set up some fancy (legacy technology at this point) Frame Relay stuff for labbing OSPF.  I encountered:

R1(config)#int s1/2.1 multipoint 
% Warning: cannot change link type

Hmm weird I thought.  Before blaming this on GNS3 or a crappy image, I did some shallow digging on Google.  Apparently, a lot of newbies like me have run into this problem.  The solution is that Cisco subinterfaces default to being in point-to-point mode.  Once created, it cannot be changed to a multipoint interface without doing the following:

R1(config)#no int s1/2.1
Not all config may be removed and may reappear after reactivating the sub-interface

R1(config)#int s1/2.1 multipoint 
R1(config-subif)#

Hey I’m in!  Just a quick FYI for those who may be miffed by the idiosyncrasies of Cisco IOS.  This was on 12.4T.

OSPF First Slides are up!

https://docs.google.com/presentation/d/17SIXDkhrrmGRywgCXmycUnOgkXXSzoldheFTdQzLbE8/edit?usp=sharing

I got the the Foundation Learning Guide for further CCNP studies.

 

These are pretty much taken straight out of the text.  But I present it and organize it in a way that makes more sense for me.  So I don’t take credit for writing this.

 

I’m also linking certain website for other ways to explain tough topics.

 

Please enjoy!