Understanding Technology One at a Time!!!

The previous topology was concerned with establishing a E-BGP neighborings with two directly connected networks . Now lets turn our focus to the ones which are not directly connected but yet needs to be E-BGP peers

The following topology will be used by me

R2 ->R1 — 172.16.1.0/24

R1->R4 — 172.16.2.0/24

R4 :

router bgp 1

nei 172.16.1.2 remote-as 2

R4

router bgp 2

nei 172.16.2.2 remote-as 1

when we turn on debugging and wait for something to happen. Actually first we need see if we have network layer reachability to routers then we can worry about EBGP peerings . Hence i set up a static route and enable

DEBUG IP BGP IPV4 UNICAST

For EBgp relationships

Now if we are left with other configuration option such as Ttl-security lets see how things get worse from one end

even though the state changes from IDLE / ACTIVE -> OPEN SENT it never comes to established

The other router will always be in open confirm mode

Lets verify that

Because the other router is expecting a incoming ip packet value TTL should be atleast 253  or higher . so the solution is to configure R2 such that it sends TTL OF 255 so that by the time packet travels 2 hops its TTL would be 253 .

or the other option is to set ttl-security option to Router 2 also . But we would rather miss the fun Right

Ok lets do it on R2

Yaa can you see the multihop working now in accordance with TTL-SECURITY . Its bed Time . Meet you Tomorrow with some other fun stuff

Regards

Rakesh

This is a simple lab which demonstrates the requirements of bgp external peerings

we have got two routers on 172.16.1.0/24 subnet

R1->172.16.1.1 ,r2->172.16.1.2

R1

Router bgp 1

neighbor 172.16.1.2 remote-as 2

R2

Router bgp 2

neighbor 172.16.1.1 remote-as 1

lets see the routers BGP process and some debug messages

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More to come with E-bgp peering with EBGP-MULTIHOP And other ways of doing things

I have been working on core technologies and was busy . Its show time now and started with preparation again . Today and Tomorrow may be a well deserved BGP session and some of the ospf core Lab scenarios . Found one of the very interesting scenarios with ospf and would update you soon on that .

will update with bpg and some of the ospf points in the mean time . Happy Weekend guys / gals

Best Regards

Rakesh

Hello everyone !

its been a while i wrote to my blog ! Many things happened in the mean while .. first of all i got a job and was busy in adapting to the new role and secondly i went through a very frustrating phase in my personal life and everything was near hell !

Moving on .. well i am done with mcse 2k3 and also planning for mcitp enterprise admin and also speaking of which have other juniper exams remaining which i need to clear up . Dint had any study and i dont know if i can pass them or not

completed some of the link layer technologies and also moving on to labs ..

a detailed excel sheet will be uploaded . You can get it and also make some of your own . excel sheet plan creation is helping me to keep some of the things track down .

Hello all in my certification rush got through some gift vouchers from my friends and went on to attempt my first ever 70-290 just to try my luck .. went through the study guide and poof went through exam .

Hello all two good news to start wtih

Hello guys , i have made a video on deploying and implementing syslog server in gns3 environment . A syslog server logs all messages from routers in gns3 and records them .

From today iam a jncia-ex .. how good does it sound and also still being a student having certification for free is quite a lot of achievement for me .. For those who are unaware juniper is offering their associate and one specialist routing exams for free once you meet their requirements .. links can be found on right side of the blog .. so moving along

Dont know why my mind has been in an unpredictable state .. nothing settling down .. wanted to for jncia-ex as per my last posting .. dint get chance as i was attracted by cisco v4 written beta . done with mpls and ipv6 which were troubling me in two days .. now after that a thought came into my mind to prepare for jncia-ex switching which was obviously easy when compared with other tracks atleast .. quickly went through the study guide ..

juniper offers good materials . their study guides are awesome covering important points in bold boxes and lots of place for jotting down the notes .. done with the associate switching which seemed obviously easy once you are at command prompt … just gave two good reading and questions were direct and out from text book .. no twist or whirl of questions which is not the case with cisco

Hello myself and another friend of mine are going for our rs studies and were on gtalk last night discussing some multicasting and general prep stuff . I suddenly got an idea on remote desktop and heard about team viewer few months ago. Quickly went to their website and downloaded the stuff .

Hello everyone as you know if i come across any exciting stuff i share with most of you . I happened to get narbik ‘demo’ of his cod which was roughly around 10min on ospf filtering techniques and the entire cod was awesome … In ten minutes he covered most of the info with minute details . The demo vod should be up with in a day or two . can’t wait to get hands on that one as iam going for rs v4 which includes troubleshooting.

for more info you can always visit his site @

http://www.net-workbooks.com/index.html

will update you if i happen to find any interesting stuff again ..

guday and take care

Rakesh