how to identify EIGRP Router-ID of a specific route ??

[mohammed hashim]

hi,

assume there is default route in EIGRP routing table, and you want fastly to identify how is the router who originate this default route.

is there a way other than tracing it hop by hop ?

[Peter Paluch]

Hi Mohammed,

Assuming that the default route was redistributed into EIGRP, you'd get the originator information by looking up the route in the EIGRP topology table:

R2# show ip eigrp topology 0.0.0.0/0
IP-EIGRP (AS 1): Topology entry for 0.0.0.0/0
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 281600
  Routing Descriptor Blocks:
  10.0.12.1 (FastEthernet0/1), from 10.0.12.1, Send flag is 0x0
      Composite metric is (281600/256), Route is External
      Vector metric:
        Minimum bandwidth is 10000 Kbit
        Total delay is 1000 microseconds
        Reliability is 0/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1
      External data:
        Originating router is 1.1.1.1  
        AS number of route is 0
        External protocol is Static, external metric is 0
        Administrator tag is 0 (0x00000000)
        Exterior flag is set

On more recent IOSes (15.x), even internal EIGRP routes carry this originator information; however, this feature may not yet be universally supported.

Best regards,
Peter

[mohammed hashim]

thanks Peter,

it is clear