System Management
210
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
The following NSR entities remain intact after a switchover:
• ATM/IMA VPs/VCs
•LDP
• PPP and MLPPP sessions
• RIP neighbors
6.2.1.3 In-service Upgrade
In-service upgrades allow new routing engine software and microcode to be installed
on the 7705 SAR while existing services continue to operate. Software upgrades can
be performed only for certain maintenance releases (generally R4 loads and higher).
Software upgrades also require NSR. If software or microcode on the CSM needs to
be upgraded, CSM redundancy is required.
Follow the steps below to upgrade routing engine software on the 7705 SAR without
affecting existing services:
1. Install new software on the standby CSM.
2. Reboot the standby CSM for the new software to take effect.
3. Perform a manual switchover on the active CSM by using the force-switchover
command on the CLI. The standby CSM becomes the active CSM, placing the
formerly active CSM into standby.
4. Repeat steps 1 and 2 to upgrade the standby CSM.
6.2.1.4 CSM Switchover
During a switchover, system control and routing protocol execution are transferred
from the active to the standby CSM. A switchover may occur automatically or
manually.
An automatic switchover may occur under the following conditions:
• a fault condition arises that causes the active CSM to crash or reboot
• the active CSM is declared down (not responding)
Note: The in-service upgrade requires the adapter cards to be reset. This will cause a short
outage.
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