Category Archives: configuration

MTU and PMTU on JunOS

I would like to talk about couple of things in this post about MTU on JunOS;

  • Why do we have two different MTU settings i.e at interface and logical level?
  • What is the meaning of path mtu discovery on a junos box
  • How MTU is important for OSPF?

Actually all started with my OSPF tests in my lab. I was connected to one SRX device in my home network and playing with MTU settings at interface level and unit level to see the differences and all of a sudden I lost my connection. To be honest I like doing non-destructive mistakes as they teach me a lot. Now I recall again how MTU is an important piece in OSPF messages. Lets start from beginning again;

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Archiving junos configurations

There is a very handy feature in junos which you may find very useful if you have lots of junos devices. JunOS can send your active configuration after every commit to a configured remote destination server by using scp,http or ftp protocols. A small configuration is sufficient to achieve this. For example with the configuration below, my SRX device’s configuration is sent to 192.168.103.20 within the specified interval.

If you list the files on the remote server you will see the files transferred after commit;