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Well, we know how to retrieve information from our devices using netconf. Let's

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now begin

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modifying configurations with our edit config rpc's. So with that said, all I

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will do is copy the

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previous script and create one called script5.py. Let's open this up. All right

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, okay, so let's see

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what we're going to do here. So let's maybe go and see that we want to

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configure OSPF on our device.

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Here's the first thing I'll do. What I recommend is very, very similar to what

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we saw with

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restconf is to first configure the configuration that you want via the CLI and
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restconf is to first configure the configuration that you want via the CLI and

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then when

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you get requests to pull that information, once we've done that, we can use

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that as a template

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for what the configuration structure should actually look like. So what I will

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do here is go

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in to this device once again. Okay, so SSH admin and paste this in. Type in the

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password.

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All right, so let's do showrun section eIGRP. We can see we have this

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configuration for now. Let

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me just remove this. Okay, I don't want any other routing configuration apart

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from what I'm going to
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from what I'm going to

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configure right now. So I'm going to also check if I have any OSPF, which I don

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't, but I do actually

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have some bgp. So what I will do here is just remove this. So say no router bgp

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100. Not all I will

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do here is I will just say router OSPF1. I will add the router ID of all the

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ones and I'll just say

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network wanting to 168 1.0 and give it a slash 24 mask. Put an area 0 and let's

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also add another

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network of hell. Let's just go with 2.0. Okay, so here is the thing what I will
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network of hell. Let's just go with 2.0. Okay, so here is the thing what I will

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do here is I will go back

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to my little script here and all I will do is I'm just going to grab the native

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key and I run

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script 5. So like we say this is going to give me all the running configuration

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. What I want to do

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is I want to grab this router key, which is going to contain all the routing

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information. So all I

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will do here is just add forward slash router, save here, pull this green, add

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it up and run again.

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Okay, so if I just scroll on up and zoom out a little bit here is all the

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information. Now what I

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want to do is this you're going to notice that the first tag is RPC reply and
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want to do is this you're going to notice that the first tag is RPC reply and

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the bottom tag is also

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RPC reply. Within this we have a data tag and a closing data tag. What I'm

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going to do right now

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is I'm going to copy from the data tag at the bottom all the way to the data

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tag at the top.

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Let's grab this, copy here and let me go in right here. Let me just create a

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little variable called

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OSPFconfig and again we'll have a multiline strings while I'll have my three

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quotation marks and

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I'll just paste in what we just saw there and let me just zoom out a little bit

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so we can see this.
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so we can see this.

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Now first thing is first what I want to do here is to make some modifications.

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The first thing to do

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is because we're going to make a configuration change I actually want to change

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the data tags to be

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config tags so that's the first thing I'll do here. Now the first config tag I

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'm going to add the name

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space information that you actually will recall here. Here's information I got

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back here XMLNS

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all this. Let's grab all of this right here and I'm going to add that within

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the first config tag

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like this. Now this here is actually a valid payload that I could send to my
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like this. Now this here is actually a valid payload that I could send to my

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target device and it

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would understand what I'm trying to actually configure. Now right now the

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configurations are already

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on the box but what I can do is actually remove them. Now the first thing to

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state here is that there

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actually are different operations we can have with our edit config RPC. So the

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first thing we can do

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is select to merge our configurations quite simply what we'll do here is we'll

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leave whatever

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configurations are already on the box and we'll just merge in these new

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configurations I able just

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add these new configurations to what is already existing. So imagine let's just
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add these new configurations to what is already existing. So imagine let's just

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maybe say

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already on the device we had a network statement of 192 168 3.0 with the slash

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24 mask in area 0k.

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Well if I happen to send this payload which adds 192 let me just zoom in a

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little bit. If I were to

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add this payload which adds this network as well as this network any merge

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operation and like a

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say it would leave the existing network already on the box of 192 168 3.0 but
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say it would leave the existing network already on the box of 192 168 3.0 but

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it would just add this

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network as well as this network to the device. Now that is the first operation

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we can do it

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emerge but we can also do is a replace operation. Now essentially what a

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replace operation will do

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it will replace what is already on the box with whatever it is we have right

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here so this is what

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is known as a declarative configuration. So to use the same example if already

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on the box we had

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an OSPF configuration with the network statement of 192 168 3.0 slash 24 mask
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an OSPF configuration with the network statement of 192 168 3.0 slash 24 mask

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in area 0.

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If I happen to send this particular payload in an operation replace will the

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only OSPF configuration

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that would be on the device after the operation would be these ones this would

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replace whatever was

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already there so that means an effect this one here would ultimately be deleted

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from the box.

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Let me show you what I mean okay. So the first thing I will do here is in my

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router key I will say

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operation equals and then in quotation marks I will say merge okay. Now

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remember right now on

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the device these two networks are already there if I go back in fact just log
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the device these two networks are already there if I go back in fact just log

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in do a show run

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section OSPF like I say these are already existing on the device. If I happen

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to change these

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configurations let's add 3.0 and 4.0 and we choose to merge the configurations

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we will leave

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these existing statements on the device and just simply add two more as per

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this payload the

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three network and the four network. Now in order to do this what I'm going to

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have to do is to also

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specify a different RPC descent so instead of a get config I will send an edit
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specify a different RPC descent so instead of a get config I will send an edit

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config and again

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if I want to target the candidate data story could but in my case here I will

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just target the running.

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In this case here we're not going to specify a particular filter what I want to

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do is I want to tell

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what config I want to be sending so the actual config here is labeled OSPF_con

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fig so that is what

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I will actually send here and in this case here let me just print out the

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result regularly okay

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and the last thing I need to do actually is I need to change the source the

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keyword here is going to
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keyword here is going to

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be target when we make a configuration change so with that now done let's just

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run the script notice

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in the output we actually get this okay response as we can see right there so

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if we log into the

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device again and I do my show run section OSPF look at this right here the

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already pre existing

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configurations are left unaffected and all we've done is merge in two more

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network statements

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now here's the thing if I happen to maybe make a modification and I change this

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to be an operation

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replace save this what we're effectively telling the device is whatever OSPF
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replace save this what we're effectively telling the device is whatever OSPF

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configuration we have

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we want to replace it just with these particular configurations so in essence

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we should actually

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delete the other two networks okay so let's try this out arrow up try again

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once again we get the

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okay response let's log in let's do show run section OSPF check this out right

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here see that we have

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fully replaced the OSPF configuration with simply what we've defined in this

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particular payload

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anything that is not defined has been deleted by inference so again let's maybe
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anything that is not defined has been deleted by inference so again let's maybe

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see I remove one of

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these network statements right here okay just delete this and let's maybe

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change this to be 192 168

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let's go with 12.0 the only OSPF configuration we have is this particular

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network and we want to

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replace all the current OSPF with all of this config okay so let's save this

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exit back out arrow

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up try again we get an okay statement let's log back in and again just do show

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run section OSPF

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we have fully replaced the configuration that was on the box with this new
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we have fully replaced the configuration that was on the box with this new

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config okay see that

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now there also is another operation we can do and that is just to explicitly

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delete something

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so what I could do is if I go back to my configuration let's just log in let's

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just configure more OSPF

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information let's just say network 10 000 slash 24 mask let's put it in area 51

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if I want to just

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particularly delete this piece of the configuration what I could do is I could

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specify an operation

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delete but I don't want to use this particular tag because that is going to
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delete but I don't want to use this particular tag because that is going to

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effectively delete

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everything with thinnestags see this the only thing in my case here I want to

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be deleting is this

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network statements all I do is specify the tag that I want to be targeting so

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this one here so let's

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go in here and I'll remove operation of place right here in this time I'll go

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to the network level

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and I'll just say operation equals delete so if I save this and it exit out and

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I read on a script

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once again we get that okay response let's log back in if I do show run section
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once again we get that okay response let's log back in if I do show run section

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OSPF as we can see

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here we have explicit deleted just that network statement.