nanog mailing list archives
Re: Whats so difficult about ISSU
From: Alex <dreamwaverfx () yahoo com>
Date: Fri, 09 Nov 2012 02:19:37 +0200
http://www.juniper.net/techpubs/en_US/junos/topics/concept/issu-oveview.html The Juniper ISSU guide. You need two things: 1. Separation of the control plane and forwarding plane2. 2 routing engines in the same chassis -- the non active RE upgrades first, then when its up and running the active one goes into upgrade mode and control fails over to the secondary RE which is running the upgraded version of the software.
I assume it works on any vendor that has 2 REs in the same chassis and the fwd and control planes are separated, and there is a redundancy protocol running between the two REs(like Graceful Switchover on Juniper gear).
On 11/09/2012 01:42 AM, Kenneth McRae wrote:
Juniper also offers it on the EX virtual switching platform. Works if you have the correct version of JunOS. On Thu, Nov 8, 2012 at 3:38 PM, Zaid Ali <zaid () zaidali com> wrote:Cisco Nexus platform does it pretty well so they have achieved it. Zaid On Nov 8, 2012, at 3:22 PM, Kasper Adel wrote:Hello, We've been hearing about ISSU for so many years and i didnt hear that any vendor was able to achieve it yet. What is the technical reason behind that? If i understand correctly, the way it will be done would be simply tohaveextra ASICs/HW to be able to build dual circuits accessing the samememory,and gracefully switch from one to another. Is that right? Thanks, Kim
Current thread:
- Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Zaid Ali (Nov 08)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Alex (Nov 12)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Zaid Ali (Nov 08)
- Re: Whats so difficult about ISSU Phil (Nov 08)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Oliver Garraux (Nov 08)
- Re: Whats so difficult about ISSU Phil (Nov 08)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Jonathan Lassoff (Nov 08)
- Re: Whats so difficult about ISSU Jimmy Hess (Nov 11)