FAQ-What Is the Default Cost of the Loopback Port of an NE5000E in ISIS

Publication Date:  2012-07-27 Views:  227 Downloads:  0
Issue Description
Q:
A loopback interface is a virtual interface with no actual bandwidth value.
By default, the OSPF cost of a loopback address on an NE5000E router is 1.
What is the cost of the loopback port on an NE5000E in ISIS? 
 
Alarm Information
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Handling Process
A:
By default, the default cost of the loopback port of an NE5000E in ISIS is 0. the command output is as follows:
<NE5000E>display  current-configuration  interface  loo 0            
#                                                                               
interface LoopBack0                                                             
 ip address 61.177.232.254  255.255.255.255                                    
 isis enable 1                                                                  
 isis circuit-level level-1                                                                     
#                                                                               
                                                          
<NE5000E>display isis  route  61.177.232.254                         
                                                                                
                         Route information for ISIS(1)                          
                         -----------------------------                          
                                                                                
                        ISIS(1) Level-1 Forwarding Table                        
                        --------------------------------                        
                                                                                
 IPV4 Destination     IntCost    ExtCost ExitInterface   NextHop          Flags 
                                                                                
------------------------------------------------------------------------------  
 61.177.232.254/32    0          NULL    Loop0           Direct          D/-/L/-
Of course, the setting can be modified through [NE5000E-LoopBack0]isis cost x . 
 
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