You can search Cisco for this type of information. For instance, the Cisco document, High Availability Overview, has a table:
Hardware Redundancy Overview on the Cisco ASR 1000 Series Routers
Some models of the Cisco ASR 1000 Series Routers offer hardware
redundancy within the same Cisco ASR 1000 Series Router through the
- Allowing two Route Processors (RPs) in the same Cisco ASR 1000 Series Router
- Allowing two Enhanced Services Processors (ESPs) in the same Cisco ASR 1000 Series Router
No hardware redundancy is supported for the following hardware:
- SPA interface processors (SIPs)—A SIP must be reloaded, and traffic briefly interrupted, for a SIP upgrade to complete.
- Shared port adapters (SPAs)—A SPA must be reloaded, which will briefly interrupt traffic to that SPA, for a SPA software subpackage
update to complete.
Hardware redundancy on the Cisco ASR 1000 Series Routers gives users
the following benefits:
- A failover option—If a processor fails, the standby processor immediately becomes the active processor with little or no delay. The
failover happens completely within the same router, so a second
standby router is not needed.
- No downtime upgrades—Using features like ISSU, a software upgrade can be handled on the standby processor while the active processor
continues normal operation.
Hardware redundancy is available on the Cisco ASR 1006 Router only at
provides a hardware redundancy overview.
As you can see, it depends on the particular router model and part.