The only answer without more info is "it depends" unfortunately.
What release are you upgrading from and going to?
I'd start with the upgrade guides here:
http://www.cisco.com/web/Cisco_IOS_XR_Software/index.html
Rich
On 12 May 2009, at 17:41, Marlon Duksa wrote:
Hi,Can anyone point me to the documentation where it says that Cisco
IOS-XR
on CRS-1 supports a true in-service-software-upgrades (ISSU)?
I've been looking on CCO but all they talk in IOS XR is ISSU where
they
patch a code and things like that.
What I'm looking is to upgrade a CRS-1 to a new software image with a
subsecond outage. This means upgrading the control plane and line
cards with
the new software images with subsecond outage. Not just a specific
software
module or a line card but the whole system to upgrade between two
major
releases.
I assume that non stop routing (not forwarding) would be a
prerequisite for
this, but it seams that they support NSR only for ISIS. NSR implies
statefull failover where all protocol states/transactions are
mirrored and
synched between two routing engines. For example, BGP TCP sessions
stays the
same during the routing engine failover.
Thanks,
Marlon
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