Cisco 3825 Hardware Installation Guide - Page 368

Online Insertion and Removal of Cisco NAC Network Modules Chapter 34 Connecting Cisco Network Admission Control Network Modules Establishing a Gigabit Ethernet Internal Logical Connection Use the Cisco High-Speed Intrachassis Module Interconnect (HIMI) feature to establish a Gigabit Ethernet (GE) internal logical connection between two NMEs, or between an onboard small-form-factor pluggable (SFP) GE module and an NME on Cisco 3825 and Cisco 3845 routers. Connections can be established only as follows: • Between the GE port in an installed onboard SFP module on the Cisco 3825 and Cisco 3845 routers • Between GE interfaces in NME slots 1 and 2 on the Cisco 3825 router • Between GE interfaces in NME slots 2 and 4 on the Cisco 3845 router Note A module interconnection between the GE port on an SFP module and an NME slot or an NME-to-NME cross-connection is permitted at any given time, but both types of connections cannot exist at the same time. Note Connections between the onboard RJ-45 GE ports and NME 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 NAC 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). Module OIR provides uninterrupted operation to network users, maintains routing information, and ensures session preservation. Caution Unlike other network modules, the Cisco NAC network module uses a hard disk. 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. 34-24 Cisco Network Modules Hardware Installation Guide OL-2485-20