Junos OS

Hi everybody

In Cisco, we see a close relation between CISCO IOS and underlying harware platform, for example  if we have 2691 router we can not run IOS 15 on it.

When I contrast this with Juniper, based on the my book, i see we can have one single JUNOS that can be installed on a different Route engines for various Juniper M, T series routers. ( I am not sure if above is also true for MX as my book does not say anything).

Is it really true?  

Thanks and have a nice day!!

Hi sarahr202,

Most of the time it is true that you can have one single JUNOS that can be installed on a different Route engines.

However, there are supportability matrix that needs to be looked into when a RE may have reached EOL for a JUNOS version.

This can be checked in below links;

https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/general/routing-engine-m-mx-t-series-support-by-chassis.html

http://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/routing-engine-m-mx-t-series-specifications-by-model.html

HTH

Appreciated!!

Hi Shailesh,

I apprecaite your help.

If  we want juniper to support a  certain engine on a particular router then we have to abide by that matrix, but that is what Juniper requires for support contract.

Let say we do not want any Juniper support, can we still able to install  JUNOS 9.0 ( which is for M10i) on RE for M40e?

In other words, if we disregard the " support factor'" can we theoritcally use one JUNOS on different RE for different Juniper models of routers?

Thanks.

Hi,

Yes, You can run any Junos if it is supported by the routing engine whether it is EOL(End Of Life) or not. And as far as support is concerned, Juniper will still support your device running EOL junos. Only thing is that engineering support like raising a bug will not be possible.

Regards,

Rahul

Please mark my solution as accepted if it helped.

Hi,

You can install any Junos supported by your routing engine. For example, if you have RE-S-1800x4, the first Junos supported is 10.4. However, if you have RE-S-1800X4-32G-S, the first supported is 12.3R4. You can check the below link for all the supported Junos version as per your routing engine:

http://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/routing-engine-m-mx-t-series-specifications-by-model.html

But it is always recommended to run same Junos on both the routing engines whether it is M, T or MX.
 The only thing to take under consideration is deciding which Junos to install.
 Either you can install as per your network requirements or go by Juniper recommended Junos as mentioned in the below KB21476 :

https://kb.juniper.net/InfoCenter/index?page=content&id=KB21476&actp=METADATA

Regards,

Rahul

Please mark my solution as accepted if it helped.