Cisco 3825 Hardware Installation Guide - Page 416

Chapter 40 Cisco Video Management and Storage System Enhanced Network Modules Online Insertion and Removal of Cisco Network Modules Procedure Establishing a Gigabit Ethernet Internal Connection Use the Cisco High-Speed Intrachassis Module Interconnect (HIMI) feature to establish a Gigabit Ethernet internal logical connection between two network modules, or between an onboard small-form-factor pluggable (SFP) Gigabit Ethernet module and a network module on a Cisco 3825 router or a Cisco 3845 router. Connections can be established only as follows: • Between the Gigabit Ethernet port in an installed onboard SFP module on the Cisco 3825 router or Cisco 3845 router • Between Gigabit Ethernet interfaces in network module slots 1 and 2 on a Cisco 3825 router • Between Gigabit Ethernet interfaces in network module slots 2 and 4 on a Cisco 3845 router Note A module interconnection between the Gigabit Ethernet port on an SFP module on a Cisco 3825 router or a Cisco 3845 router and a network module slot or a network module-to-network module cross-connection is permitted at any given time. However, both types of connections cannot be implemented at the same time. Note Connections between the onboard Ethernet ports and network module slots are not supported. For details about configuring High-Speed Intrachassis Module Interconnect (HIMI) connections, see the Cisco High-Speed Intrachassis Module Interconnect (HIMI) Configuration Guide on Cisco.com: http://www.cisco.com/en/US/products/ps5855/prod_configuration_guide09186a008068ea83.html Online Insertion and Removal of Cisco Network Modules Procedure Some Cisco routers allow you to replace network modules without switching off the router or affecting the operation of other interfaces. This feature is called online insertion and removal (OIR). OIR of a module provides uninterrupted operation to network users, maintains routing information, and ensures session preservation. Caution Unlike other network modules, Cisco Video Management and Storage System enhanced network modules use hard disks. Online removal of network modules without proper shutdown can cause file system corruption and might render the disk unusable. You must shut down the operating system on the network module in an orderly way before removing or powering down the module. Caution Cisco routers support OIR with identical modules only. If you remove a module, install in its place another module exactly like the one you removed. If you remove a 2-slot module (along with any installed WAN or voice interface cards), install another module and card combination exactly like the one you removed. 40-4 Cisco Network Modules Hardware Installation Guide OL-2485-20