Cisco Certified Network Associate day 46 welcome back everyone, I am Imran Rafai
your trainer for this entire series today we will continue from our last video where
we learned about OSPF Configurations and today's video is
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this premium offer. all right let's start with this class today we're gonna do 2.4
which is configure verify and troubleshoot we did the configuration
part in the last video so this video we're going to look at the verification
part and verification is very very important it's part of your learning
process when you know verification commands and if you know what is
available and what command that is going to help you in your troubleshooting
right but before we start the video I need to apologize because there's been a
very very bad mistake in the last video part of the OSPF dr vidya relation I
said OSPF process number and then route ID that's that's the preference but
actually it's not OSPF process number it is also a priority so it first looks at
those fifth priority of all the devices and if the priority matches
it looks like that's our ID so apologize for that mistake and I think this is a
side effect of recording videos in the middle of the night I think the last
video was recorded at 2:00 a.m. but not that this video is any different it is
at the moment 2:45 a.m. so but yeah this is the only way I have time no this is
only way where I can assign time for this project to complete this project as
soon as possible there been some the things happening on my personal front
and that is the reason I couldn't record a video in the last two months
so I literally did not watch that video the last time I recorded the video at 2
a.m. by about 3:00 3:30 in the morning I had I think 3:30 or 4 I don't remember
by about 5 before I went to bed I edited the video and uploaded it online and so
I did not have a chance to check the video I didn't have a chance to talk
normally before I upload a video I I played once and I see this an error
sometimes some errors I just left past because the effort to go in ahead and
rerecord something and you know corrected it's too much so I tend to put
the errors in the description so I just say it this is the this is the mistake
and then you know you need to change this but the last video I just did not
have time to go through so I did not even cat set error until now just before
I started recording this video I want you to know what I did in the last video
so I went and I played that video on YouTube and I realized that was a that
was a real bad mistake I mean always face priorities different for most
people society and I don't know why is it always PF process ID but I didn't
have anybody come comment not generally you guys are very very sharp in your
criticism and for some reason I didn't get any one comment on that and say that
anon what he said was wrong and had I had I got that comment but I keep
reading the comments I didn't find this comment I don't think
so anybody commented saying that this particular information was wrong anyway
just to clear there this is Oh Smith priority that's the number one to check
those Peas priority for all the devices and the most likely by before those
priority is one for the devices so it's a time and then it looks at around tiny
and then we know how router IDs sign to each device and the the best idea wins
the election and you know what happens after that
right so that's what that we look at Oh five verification commands and this
verification commands you need to know what is available at what verification
come on you might have a cc in the question which says which of this
verification command do you does it show the route writing so you need to know
which which verification command would display the route writing right so these
are the level you need to know what at least if not everything you need to know
the most important bits of information that you can find in these verification
command so the first verification commands we're
going to look at is show IP protocols the information that you can find or the
clinical information that you can find there is router ID number of configured
area the network command and the round information sources right so let's look
at this from packet tracer alright so this is the same to polish that we
worked on in the last video so let's go to route 1
so in Rada one let's try show IP protocols and then we see this
information says routing protocol is OSPF one then it says router IDs without
ID of this particular device is given here it says there is only one area that
is configured obviously if it's a single area it has to be areas 0 then it gives
the information of the network so basically what are the networks that
this particular router this particular way of process rather is advertising so
it's advertising these OSPF I mean these networks round
information sources or information sources at the moment it is only seeing
these two devices and that's because I think because I we just started this
packet tracer topology so the neighbors are still being formed so I think after
we put that command is just as the change happened loading the full loading
the full so three and four went to full only after we did so if we do the same
command again I think we'll have more yeah you can see it here one while these
are the five routers and the router ID is given here which are the information
sources for this OSPF protocol right so this is your first verification command
the next verification command is show IP ospf
and the part of information is router and process IDs area numbers and it will
tell you if there is authentication happening for in between these OSPF
routers and the number of time SPF is executed right so show IP ospf and then
you will see that here you would see it is running OSPF one with a router ID of
one or one or two dot one so again in this verification command also the
router ID is mentioned it tells that this is an area backbone that's area
zero it has number of interface that is connected to this is four and we looked
at those interfaces it looks at whatever it was yes the SPF
algorithm was run three times so we know that SPF algorithm is recalculated every
time there is a change in the topology so since this is just starting up when
it received the first let's say second let's say the LS DB got changed and
every time the change happening we calculated the SPF was really cute and
then the routing table was populated right and the area has no authentication
- it's not Authenticator there's no authentication for communication between
these devices the next routing verification
command that you're gonna look at is show IP ospf interfaces now this will
tell the physical state of interface it will tell the IP information it will
tell router ID network type it will also give you dr and period information if
it's a broadcast network it would also tell you the timer configurations or
time or values that's configured and then add sensitive information so let's
have a look at it from packet tracer show IP ospf interface and then we see
let's just expand this we see this loopback 0 and it says it is a loopback
interface it has the IP address information the cost is 1 loopback one
so if you know R or ID is if it's not physically fits not statically
configured using the command router ID the next best thing it looks at is
loopback interfaces off the loopback interfaces if you have more than one it
looks at the large number so in this case this is a larger number and that's
why the router ID for this particular router in OSPF is 1.1 or 2.1 right
that's how the router ID is chosen so the next interface is Gigabit Ethernet
0/0 and the IP address is 191 6501 it is a broadcast network and the cost is 1 we
discussed the cost how the cost is calculated so I'm not going through that
the state of this particular device is dr other and the designated router is
4.4.4 the interface through which it's accessible is 1.19 to 160 or 1.4 BDR is
3.0 303 and the interface through which it is config accessible is 1.3 the hello
time is 10 dead time has four times hello time'
then it says neighbors it has three neighbors adjacent neighbor
count is two that means it has gone into full adjacency with two that's I mean if
you remember when we discussed last video and we will look at it when we
look at the neighbor table with the BD R and D are it's going to have full and
the other D our other device like you'll have one more the other
the rod one is the another this or to also do other so with the other it is
only have good to have a two-way adjacency right so it says I just sent
is with two it has three neighbors but only with two it has full logistics and
that is router 3 which is dr rod 4 which is dr and router 3 which is BTR the
serial connection so this connection it is a point-to-point network so
point-to-point network will not have dr and PDR so it says no dr no BDR
the cost is 64 and you have the same hello time and date time information
right so it has a Justin C with it has only one neighbor and this adjacent with
one neighbor right which is understood because it's a point-to-point network
the next verification command is show IP ospf neighbor and in this verification
command you're gonna look at neighbor router IDs priorities as adjacency
States Gateway information dead timer and interface information let us look at
this from packet tracer so show IP ospf neighbor and then we see that we have 4
neighbors and 2 of them in these are 3 in the broadcast networks who in the
progress network 2 of them you have full adjacency one is in two-way which is the
dr other and firefighter 5 is part of the point 4 network and that's why you
see this information is blank so one when you see this information blank you
need to know that is a point for network if it is a broadcast network you would
have it has to take one of these values b dr dr other or dr 3.0 3 is b dr it's a
full adjacency it is accessible through one extra 168 one of three through this
physical interface and this fighter 5.5 is also in full largest in sea state and
it's a point-to-point network and it is accessible through the serial interface
right so this is the neighbor table the next a verification command is show IP
ospf database this is nothing but the link state database let's look at it
from packet tracer show IP or PF database and we see I mean of course
there is a router ID here we get the router ID information and then we have
this this is a router links here so that's links LSF type type one we don't
really need to look at LSA types but just so that you know these are all the
routers that is taking part in this OSPF right so every device in this OSPF area
zero should have a same LSD be right it should all have these five devices
listed and then they do their own SPF algorithm to populate the routing table
right so this is what links in database would give this information should be
there in the links team database so that's about the five verification
command before you go I'm gonna give you one new thing so this is a topology this
is a partially configured topology I have configured OSPF partially but there
are a few more things that you need to do I'm gonna put this for download on
the website so go to the store and find de for resources or something like that
I would leave the link to the store in the description below so click on map
and download this it's gonna be free what we need to establish is you need to
have PC 0 we we need to have the pc 0 ping 2 PC 2 & 3 C 0 should also be able
to ping to PC 1 and PC 1 and PC 2 should be able to ping each other right so you
need to go to each of these routers and see why that's not happening at the
moment it is not happening you need to find out why it's not happening and then
when you know what it is configure that solve the problem and come back here and
comment your answers in the comments section below right so you should you
can say for step 1 this is what I did step 2 this is what I did step 3 this is
what I did and then this is Hawaii or to contribution in the next video
what we're gonna do is we're gonna take this again and then I'm trying to solve
I will solve it on on the next video so that's going to be a start of
contribution so then we will look at configuration we will design a network
and then we will configure that will give us configuration idea and then you
can follow with me and also we would do a troubleshooting
in in the next video so we'll take one network and why does not doing and then
we'll do a live troubleshooting so that's going to be the next video this
video I just want to do one correct the mistake of the last video to get back to
ways of recording so we want to now start finishing this is our last you
know last run so I'm just gonna do that last run maybe another 20 videos I want
to finish this series it's taken a very very long time I understand a lot of
people are frustrated but I had no other option I had to do it this way or not do
this series at all right let's hope things change there are a few things
like I said I've changed my past life so things are gonna be better and I think
it's gonna be good time stuff so stay tuned and thank you so much for watching
we will be back very very soon don't forget to like this video and subscribe
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