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Configuring Secure Domain Routers on Cisco IOS XR Software
Information About Configuring Secure Domain Routers
SMC-136
Cisco IOS XR System Management Configuration Guide
High Availability Implications
Fault Isolation
Because the CPU and memory of an SDR are not shared with other SDRs, configuration problems that
cause out-of-resources conditions in one SDR do not affect other SDRs.
Rebooting an SDR
Each non-owner SDR can be rebooted independently of the other SDRs in the system. If you reboot the
owner SDR, however, then all non-owner SDRs in the system automatically reboot, because the
non-owner SDRs rely on the owner SDR for basic chassis management functionality.
Note The DSDRSC of the owner SDR is also the DSC of the entire system.
DSDRSC Redundancy
To achieve full redundancy, each SDR must be assigned two cards: one to act as the primary DSDRSC,
and one RP or DRP to act as a standby DSDRSC.
In a Cisco XR 12000 Series Router, you can assign two redundant RP cards to each SDR as described
in the “DSC and DSDRSCs in a Cisco XR 12000 Series Router” section on page SMC-133. DRPs are
not supported in the Cisco XR 12000 Series Routers.
In a Cisco CRS-1 router, we recommend the use of DRP pairs as DSDRSC for all non-owner SDRs the
system. DRP pairs provide redundancy within the SDR, and DSC migration for the entire system. See
the following section for more information.
DSC Migration on Cisco CRS-1 Multishelf Systems
Designated Shelf Controller (DSC) migration is the act of moving the DSC role to a different part of the
router. The DSC role automatically migrates when the DSC cannot perform its function on the shelf in
which it currently resides. The cause of a DSC migration can be a failure of both of the RPs in the DSC
shelf or any event that removes power from the DSC line card chassis (LCC).
DSC migration can be triggered by the following methods:
1. Shutdown power to DSC LCC. (Recommended)
2. Hardware-module reset or shutdown of a standby RP then an active RP in a DSC LCC. (Not
recommended)
3. Online, insertion, removal (OIR) for an active RP and standby RP in a DSC LCC simultaneously.
(Not recommended)
4. Removal of control Ethernet connectivity to both RPs in a DSC LCC. (Not recommended)
Note If planned downtime of a DSC LCC occurs, the recommended method of triggering DSC migration is to
shutdown the power to the DSC LCC. The methods, which are not recommended, shutdown only one
transport medium in the system. For example, control Ethernet but fabric medium can still be up for