Cisco Cisco Packet Data Gateway (PDG) Guia De Resolução De Problemas
Software Management Operations
Upgrading the Operating System Software ▀
Cisco ASR 5000 Series System Administration Guide ▄
OL-22970-01
line software upgrade can be terminated is to issue the
command. This causes a system restart that could leave
the system in an abnormal state, requiring manual intervention. Issuing the reload command should be avoided, and
only used as a last resort.
only used as a last resort.
Once all the calls on the system are terminated, the software upgrade enters Stage 2.
Stage 2 - Stand-alone Operation
In stage 2, the system switches from normal call operations, leaving only a minimal set of system-level tasks running on
the PSCs to ensure that any errors are detected and, for PDSN and GGSN, that the re-directors used by the defined
overload policy for each service remain in effect.
the PSCs to ensure that any errors are detected and, for PDSN and GGSN, that the re-directors used by the defined
overload policy for each service remain in effect.
At this point, the SMCs are fully operational, but each PSC in the system is running independently of the others, with no
communications occurring between them. In this stage, the network processor units (NPUs) are placed into global
bypass mode, wherein the redirector tasks are supported to deny any new session requests to access the system by
redirecting them to other devices.
communications occurring between them. In this stage, the network processor units (NPUs) are placed into global
bypass mode, wherein the redirector tasks are supported to deny any new session requests to access the system by
redirecting them to other devices.
While in global bypass mode, Line Card (LC) ports will be limited to the following services:
Respond to Ethernet ARP requests
Respond to ICMP echo requests
Session rejections or redirection
The following list defines LC features or services that will be unavailable:
No AAA packets or logs will be sent for each session reject or redirect
All other packets are discarded
LC port counters will be unavailable
Port redundancy operations, if configured, will not be operational
All routing protocols, if enabled and configured, will be disabled
Routing tables will remain fixed (no updates) throughout the upgrade
PCF monitoring will be unavailable
I
MPORTANT
:
Once Stage 2 has begun, no CLI configuration mode commands, except
and
(if this stage is entered while a management user is in a configuration mode) will be accepted
by the system. Only non-configuration commands within the Exec mode, such as show commands
may be executed. You can monitor the progress of the on-line software upgrade by entering the
may be executed. You can monitor the progress of the on-line software upgrade by entering the
command.
Once all of the PSCs are operating in stand-alone mode, the on-line software upgrade can proceed.
Stage 3 - Management Card Upgrade
During this stage, the system performs an SMC switchover, wherein all tasks running on the active SMC are transferred
to the standby SMC, which then becomes active and takes control of the system.
to the standby SMC, which then becomes active and takes control of the system.