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UNCLASSIFIED Implementing Security on Cisco Routers  Version 1.0g  UNCLASSIFIED 127      . Central# show ip interface   .    . Central# show running-config   .    . 6.     Bring up external interfaces, if necessary. If you shut down your router’s external interfaces in step 2, they should have come back up as part of the reload in step 4.  If the second command in step 5 showed that they did not come back up, then bring them back up now using the command no shutdown. Central# config t Central(config)# interface eth 0/0 Central(config)# no shutdown Central(config)# end Depending on network speed and router model, this procedure may take about 5-20 minutes.  Note that, for some older Cisco router models, additional hardware-specific steps may be needed.  Consult the release notes for the particular router for details. Transcript of a Successful Update Procedure  The recorded transcript below shows an upgrade of a Cisco 3640 router from IOS 11.3(4) to 12.0(5). South> show version Cisco Internetwork Operating System Software   IOS(tm) 3600 Software (C3640-I-M), Version 11.3(4)T1, RELEASE SOFTWARE (fc1)   .   . South>show flash System flash directory: File  Length   Name/status   1   3208548  c3640-i-mz.113-4.T1    [3208612 bytes used, 5179996 available, 8388608 total] 8192K bytes of processor board System flash (Read/Write) South> enable Password:   South# copy flash: tftp System flash directory: File  Length   Name/status   1   3208548  c3640-i-mz.113-4.T1    [3208612 bytes used, 5179996 available, 8388608 total] Address or name of remote host [14.2.9.6]? 14.2.9.6 Source file name? c3640-i-mz.113-4.T1 Destination file name [c3640-i-mz.113-4.T1]? c3640-i-mz-113-4.T1.bak Verifying checksum for 'c3640-i-mz.113-4.T1' (file # 1)...  OK Copy 'c3640-i-mz.113-4.T1' from Flash to server