Eigrp metric count

Answered Question
Oct 24th, 2013
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hi,


All router running default eigrp configuration, Router 3 has 2 successor to reach r2 loop (10.1.102.2),and it both FD is 2681856, how it got 2 successor becoz  from router3 se 1/1 has two hop to reach r2 loop and from se 1/0 has only one hop. Your suggestion plz.



R3#sh ip eigrp topology 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 2681856

  Routing Descriptor Blocks:

  10.1.103.1 (Serial1/1), from 10.1.103.1, Send flag is 0x0

      Composite metric is (2681856/2169856), Route is Internal

      Vector metric:

        Minimum bandwidth is 1544 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 (Serial1/0), from 10.1.203.2, Send flag is 0x0

      Composite metric is (2681856/2169856), Route is Internal

      Vector metric:

        Minimum bandwidth is 1544 Kbit

        Total delay is 40000 microseconds

        Reliability is 255/255

        Load is 1/255

        Minimum MTU is 1500

        Hop count is 1

Correct Answer by daniel.dib about 3 years 9 months ago

R2 does not "own" the subnet. It is owned by both R1 and R2 so they both advertise it directly to R3.



Daniel Dib
CCIE #37149

Correct Answer by waqas younas about 3 years 9 months ago

Dear All see the result below. Hopefully confusions are cleared.Goodluck.


sh ip eigrp topology 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 2681856

  Routing Descriptor Blocks:

  10.1.103.1 (Serial1/1), from 10.1.103.1, Send flag is 0x0

      Composite metric is (2681856/2169856), Route is Internal

      Vector metric:

        Minimum bandwidth is 1544 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 (Serial1/0), from 10.1.203.2, Send flag is 0x0

      Composite metric is (2681856/2169856), Route is Internal

      Vector metric:

        Minimum bandwidth is 1544 Kbit

        Total delay is 40000 microseconds

        Reliability is 255/255

        Load is 1/255

        Minimum MTU is 1500

        Hop count is 1




REGARDS



WAQAS YOUNAS

CCIE#27815

Routing&Switching

Service Provider

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daniel.dib Thu, 10/24/2013 - 02:56
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The route you are looking at is the subnet connecting R1 and R2 (10.1.102.0/29). Both R1 and R2 are directly connected to this so R3 gets the same route from both of them with the same metric.



Daniel Dib
CCIE #37149

feroz syed Thu, 10/24/2013 - 03:12
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But Router 3 has directly connected to R2 (R2-->R2 20000+20000)so it should be a successor, how it select second successor by going from R3-->R1-->R2 (20000+20000+20000).

Correct Answer
daniel.dib Thu, 10/24/2013 - 05:47
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R2 does not "own" the subnet. It is owned by both R1 and R2 so they both advertise it directly to R3.



Daniel Dib
CCIE #37149

Correct Answer
waqas younas Thu, 10/24/2013 - 04:34
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Dear All see the result below. Hopefully confusions are cleared.Goodluck.


sh ip eigrp topology 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 2681856

  Routing Descriptor Blocks:

  10.1.103.1 (Serial1/1), from 10.1.103.1, Send flag is 0x0

      Composite metric is (2681856/2169856), Route is Internal

      Vector metric:

        Minimum bandwidth is 1544 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 (Serial1/0), from 10.1.203.2, Send flag is 0x0

      Composite metric is (2681856/2169856), Route is Internal

      Vector metric:

        Minimum bandwidth is 1544 Kbit

        Total delay is 40000 microseconds

        Reliability is 255/255

        Load is 1/255

        Minimum MTU is 1500

        Hop count is 1




REGARDS



WAQAS YOUNAS

CCIE#27815

Routing&Switching

Service Provider

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