July 2009
Intermediate to advanced
752 pages
23h 19m
English
Content preview from JUNOS Enterprise SwitchingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
In-Service Software Upgrades
Another feature that is very useful is the idea of an In-Service Software Upgrade (ISSU). This is a software upgrade that allows you to move to a new JUNOS release with no disruption in the control plane, and little if any disruption in the forwarding plane. This feature is supported only on dual RE platforms, including the VC, and the REs must be running the same JUNOS software version before ISSU. Lastly, in order for this feature to work, GRES and NSR must also be enabled.
Warning
As in the NSR warning, ISSU is currently not supported on EX Series devices, but the word is that it is planned.
Perform ISSU by issuing the following steps:
Enable GRES and non-stop active routing. Verify that the REs and protocols are synchronized.
Download the new software package from the Juniper Networks website and then copy the package to the router.
Issue the request system software
in-service-upgradecommand on the master RE.
During ISSU, both the master and backup will be upgraded to the new versions of the JUNOS software. Since this is not yet supported on the EX, we won’t include additional details here.
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.