Our deployment plan was to swap the current PRP cards with ones we have prebuilt within our lab. This will make it easier when migrating to IOS XR and reverting back if things go seriously wrong.
How are you finding the OS ? Do you think it's more stable and easier to manage. The bug list on CCO seems to suggest not many issues have been filled against the OS although I have a sneaky feeling it isn't giving a true representation. I don't know how popular the take up has been from IOS ? When we purchased our new GSR's it was decided to stay with IOS as the software was too new for our liking. The release at the time was 3.4. I have noticed the latest version requires 2G of flash which is going to be a cost to the business.
From your experience would you say moving to XR has been benefital ? I don't think we will have much choice especially as 12.0(33) is the last release.
we had already to patch, to install a SMU on GSR with IOS XR 3.8.0.
For the moment it is too early to say what are the advantages of IOS XR over standard IOS.
It takes 20 minutes to come up for a system with 2 PRP2 two SIP 600 and another linecard.
SSO switchover is automatic but IOS is faster to come up and you examine the coming up log messages for a short time the system executes an IOS image before booting IOS XR. It takes time also to configure the linecards so the more you have more time is needed.
also we have noticed some more sensitivity (more up/downs ) on E3 or POS lines but other have reported more serious problems (line down) with older IOS XR.
I can tell that I was able to patch a CRS-1 with IOS 3.4.1 installing 26 SMU in 4 reloads in two hours.
CRS-1 is faster in coming up after reloads.
Of course, because Cisco is pushing IOS XR the conversion is a needed step.
20 minutes to boot ? I am sure our GSR's takes less than 10 minutes with IOS. I guess that maybe a drawback of having a modular operating system, maybe in future revisions of the software they will improve the loading time.
Have you raised a TAC case regarding the instability of the interfaces since you have moved to IOS XR ?
I think we will most likely lab test the IOS XR and if it proves itself within the lab we will pick a GSR which is low risk and preupgrade 2x PRP cards and hotswap them during a downtime window and see how the operating system proves itself in our live environment before rolling out a mass upgrade program.
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