Cisco 3825 Hardware Installation Guide - Page 326

Online Insertion and Removal of Cisco Network Modules Chapter 30 Connecting AON Network Modules 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 enhanced network modules, or between an onboard small-form-factor pluggable (SFP) Gigabit Ethernet module and an enhanced network module on Cisco 3825 and Cisco 3845 routers. Connections can be only established as follows: • Between the Gigabit Ethernet port in an installed onboard SFP module on the Cisco 3825 and Cisco 3845 routers • Between Gigabit Ethernet interfaces in network module slots 1 and 2 on the Cisco 3825 router • Between Gigabit Ethernet interfaces in network module slots 2 and 4 on the Cisco 3845 router Note The Cisco NM-AON-K9= network module does not support Gigabit Ethernet connections. Note A module interconnection between the Gigabit Ethernet port on an SFP module and a network module slot or a network module-to-network module cross-connection is permitted at any given time, but both types of connections cannot exist at the same time. Note Connections between the onboard Ethernet ports and network module slots are not supported. For details about configuring 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 Some Cisco access 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, enhanced network modules use hard disks. Online removal of disks without proper shutdown can result in file system corruption and might render the disk unusable. The operating system on the network module must be shut down in an orderly fashion before the module is removed or powered down. Caution Cisco routers support OIR with similar modules only. If you remove a module, install another module exactly like it in its place. If you remove a 2-slot module (along with any installed WAN or voice interface cards), install another module and card combination exactly like it. For a description of informational and error messages that may appear on the console during this procedure, see the hardware installation guide for your router. 30-4 Cisco Network Modules Hardware Installation Guide OL-2485-20