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Sunday, July 22, 2012

eigrp lab 2 part 2...








remember this topology replaces a serial cable with an ethernet cable between r1 and r3...  my numbers don't macth with the output from the manual... a minor disappointment, but still a disappointment...

according to the lab the composite metric for both links from r3 should be 41024000/40512000...

here's what i got:

r3#sh ip eigrp topo 10.1.102.0/29                                                   
IP-EIGRP (AS 100): Topology entry for 10.1.102.0/29                                 
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 40514560          
  Routing Descriptor Blocks:                                                        
  10.1.103.1 (FastEthernet0/0), from 10.1.103.1, Send flag is 0x0                   
      Composite metric is (40514560/40512000), Route is Internal                    
      Vector metric:                                                                
        Minimum bandwidth is 64 Kbit                                                
        Total delay is 20100 microseconds                                           
        Reliability is 255/255                                                      
        Load is 1/255                                                               
        Minimum MTU is 1500                                                         
        Hop count is 1                                                              
  10.1.203.2 (Serial0/0), from 10.1.203.2, Send flag is 0x0                         
      Composite metric is (41024000/40512000), Route is Internal                    
      Vector metric:                                                                
        Minimum bandwidth is 64 Kbit                                                
        Total delay is 40000 microseconds                                           
        Reliability is 255/255                                                      
        Load is 7/255                                                               
        Minimum MTU is 1500                                                         
        Hop count is 1                                                              
r3#

the delay is nearly half that of the serial cable... so let's fix it... let's make the ethernet cable a serial cable...

r3(config)#int f0/0                                                                 
r3(config-if)#delay ?                                                               
  <1-16777215>  Throughput delay (tens of microseconds)                             
                                                                                    
r3(config-if)#delay 2000                                                            
r3(config-if)#end                                                                   

r3#sh ip eigrp topo 10.1.102.0/29                                                    
IP-EIGRP (AS 100): Topology entry for 10.1.102.0/29                                 
  State is Passive, Query origin flag is 1, 2 Successor(s), FD is 40514560          
  Routing Descriptor Blocks:                                                        
  10.1.103.1 (FastEthernet0/0), from 10.1.103.1, Send flag is 0x0                   
      Composite metric is (41024000/40512000), Route is Internal                    
      Vector metric:                                                                
        Minimum bandwidth is 64 Kbit                                                
        Total delay is 40000 microseconds                                           
        Reliability is 255/255                                                      
        Load is 1/255                                                               
        Minimum MTU is 1500                                                         
        Hop count is 1                                                              
  10.1.203.2 (Serial0/0), from 10.1.203.2, Send flag is 0x0                         
      Composite metric is (41024000/40512000), Route is Internal                    
      Vector metric:                                                                
        Minimum bandwidth is 64 Kbit                                                
        Total delay is 40000 microseconds                                           
        Reliability is 255/255                                                      
        Load is 7/255                                                               
        Minimum MTU is 1500                                                         
        Hop count is 1                            

note the delay is in tens of microseconds with the interface delay command... i arrived at 2000 because delay is in tens of microseconds, and it was already at 20100...  2000 times 10 is 20000 microseconds plus it's current delay... in other words, i guessed correctly,  i can add and multiply and i nailed the sucker...

my metric output for the topology is exactly that of the lab manual...

it's not defining relativity but it's still kinda cool...

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