CRS - Configuration Commit Database

Configuration Commit Database - all commit operatations are saved to the configuration commit database up to 100 entries. Once 100 entires have been reached then the oldest entry is deleted. Header information is still retained up to a 1000 entries.

CRS - Interface Naming

Interface Naming

r/s/m/p naming

rack/slot/module/port

show platform

RP/0/RP0/CPU0:router# show platform

CRS - CLI Modes

CRS has new modes IOS-XR Modes (some may be familiar to you and others are new)

CLI Modes

Exec Mode - This is where you begin when logging in

RP/0/RP0/CPU0:CRS-1#

Configure Mode - This is where you modify the IOS-XR 

RP/0/RP0/CPU0:CRS-1#config terminal

RP/0/RP0/CPU0:CRS-1(config)#

Controller Sonet Mode

RP/0/RP0/CPU0:CRS-1(config)#controller sonet0/2/0/1

RP/0/RP0/CPU0:CRS-1(config-sonet)# (there are additional sub modes such as "path mode")

Interface Mode 

RP/0/RP0/CPU0:CRS-1(config)#interface pos 0/2/0/1

RP/0/RP0/CPU0:CRS-1(config-if-pos)#

Routing Protocols Mode

EX: Multicast Routing

RP/0/RP0/CPU0:CRS-1(config)#multicast-routing

RP/0/RP0/CPU0:CRS-1(config-mcast-ipv4)#interface all enable

EX: Router OSPF

RP/0/RP0/CPU0:CRS-1(config)#router ospf

RP/0/RP0/CPU0:CRS-1(config-ospf)#

EX: Router ISIS

RP/0/RP0/CPU0:CRS-1(config)#router ISIS

RP/0/RP0/CPU0:CRS-1(config-isis)#

Feel free to provide additional examples