I always like the powerpoint way … i love it … i was going through the internetwork expert blog today and found excellent article by mr.scott morris on some general trouble shooting techniques that can drive you insane if not observed … i have made a power point … its publicly available in their site if you want to visit it .. you can always do it on
internetworkexpert.com
here is the link
Video 3 of the ospf lab has been released and it is based on ospf virtual link concept….. please feel free to see the topology and also some of the important points in the word doc which is also available …
you can download the video here ..
http://www.4shared.com/dir/12759943/811a5e55/sharing.html
regards
Raaki
OSPF LAB VIRTUAL LINKS:
WHY SHOULD EVERYTHING CONNECT TO AREA 0:
In order to make sure that spf is executed properly , area 0
is used as reference point for all other areas in the network
Hence all other areas must have a direct adjacency to area 0
So, the discontiguos area should be connceted to area 0 thorugh
any transit area attached to it , through virtual links
Hence , after the configuration the entire set of ospf
databases will be synced and full connectivity will be esatblished
DOC:
To define ospf virtual link, use the area virtual-link command in
router
Usage Guidelines :
In ospf , all areas must be connected to a backbone router .If
the connection to backbone is lost it can be repaired using
virtual-links
For a virtual link to be properly configured , each
virtual link neighbor must include transit area id and the
corresponding virtual link neighbor router id
video 3 has been done and it is on eigrp convegence timers over frame relay … a word document has also been attached for the reference of topology and points …
you can download them at
http://www.4shared.com/dir/12759943/811a5e55/sharing.html
Hello … the lab2 video of ospf point-to-point has been done and been uploaded … please feel free download it and also the word doc ..
http://www.4shared.com/dir/12759943/811a5e55/sharing.html
All of the basic ip addressing and frame relay mappings are done and are not included in the video … the word doc presents you with the topology and some of the important points
regards
Rakesh
I dint wanted to sell the videos even for 5$ but i thought of buying few routers and switches for the switching labs … but its against my self .. so decided that i would be giving my work to any one who requires for free … i got 4 paid requests from 4 of the friends .. but i would returning the money back to them tonight …. hence from here on please feel free to download labs and word docs for free .. and if you like you and you have something to throw you can always consider me …
Also looking for some good team members who can study with me and share some work with me .. it’s not impossible to do all the word docs and videos but it would be much easier if there is ‘team’ / ‘we’ rather than ‘me’
regards
Rakesh
ospf : network type loopback
The ospf network type loopback is a special case for loopback interfaces
Network type loopback is the default network type on loopback interfaces , and is not
normally configurable with ospf network command
The loopback network type treats the interface as stub host and injects the ip address of the
interface as host route into the ospf domain regardless of the actual subnet mask of the interface
setting the ospf network type to point-to-point disables this treatment and advertise the ip
address of the interface with the subnet mask configured on that interface
ospf network type : point – to – point
OSPF network type point-to-point is used for adjacencies between exactly
two ospf neighbors
Network type point-to-point uses multicast and has no DR/BDR election
As it uses multicast for hello packet transmission broadcast keyword is used
for frame relay mapping statements .
ospf network types : point-to-multipoint non-broadcast
ospf network type point-to-multipoint non-broadcast is similar to
the network type point-to-multipoint except that ospf packets are sent as
unicast instead of multicast
ospf network type point-to-multipoint , point-to-multipoint non-broadcast
does not support the DR/BDR election, and possesses the same next-hop
behaviour
hence layer 2 to layer 3 can be between directly connected devices on nbma network
and that ip routing will be used to communicate between devices that are not adjacent to layer 2
ospf network type : point-to-multipoint
ospf network type ponit-to-multipoint does not support DR and BDR election
point-to-multipoint sends hello packets to the multicast address 224.0.0.5
point-to-multipoint must be manually configured at the interface level using the
command “ip ospf network point-to-multipoint”
There is a difference between point-to-multipoint and the other two broadcast and non-broadcast
with the next-hop resolution on a nbma media .
ospf network type point-to-multipoint treats the network as a
collection of point-to-point links instead of one broadcast network
In broadcast and non-broadcast , ospf does not deal with layer 2 topology
and may not relate it with layer 3 network .
ospf network types broadcast and non-broadcast , next hop values are not
modified when updates are sent on nbma
This implies the device on nbma cloud requires layer 3 to layer 2 resolution
for any endpoint injecting into the network.
In ospf network type point-to-multipoint , next hop values are changed to the
address of directly connceted neighbor when they are advertised across
the NBMA cloud.
Routers on NBMA network only need layer 3 to layer 2 resolution for
directly connected neighbors when running ospf network point-to-multipoint
ospf network type point-to-multipoint advertises the endpoints of the
point-to-multipoint network as host routes instead of actual network itself
