EIGRP math

From: Wouter Prins (wp@null0.nl)
Date: Fri Jan 30 2009 - 12:01:19 ARST


Hi all,

Can someone help me with the math in achieving a 5:1 trafficshare count with
the following output?
When i do the math (48 for fa0/0) and change the delay accordingly, the
whole route disappears?

Rack1R6#show ip route 155.1.9.0
Routing entry for 155.1.9.0/24
  Known via "eigrp 100", distance 90, metric 1280, type internal
  Redistributing via eigrp 100
  Last update from 155.1.67.7 on FastEthernet0/0, 00:00:04 ago
  Routing Descriptor Blocks:
  * 155.1.146.1, from 155.1.146.1, 00:00:04 ago, via FastEthernet0/2
      Route metric is 1280, traffic share count is 12
      Total delay is 50 microseconds, minimum bandwidth is 1544 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 4
    155.1.67.7, from 155.1.67.7, 00:00:04 ago, via FastEthernet0/0
      Route metric is 3072, traffic share count is 5
      Total delay is 120 microseconds, minimum bandwidth is 100000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 2

Rack1R6#show ip eigrp topology 155.1.9.0 255.255.255.0
IP-EIGRP (AS 100): Topology entry for 155.1.9.0/24
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 1280
  Routing Descriptor Blocks:
  155.1.146.1 (FastEthernet0/2), from 155.1.146.1, Send flag is 0x0
      Composite metric is (1280/1024), Route is Internal
      Vector metric:
        Minimum bandwidth is 1544 Kbit
        Total delay is 50 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 4
  155.1.67.7 (FastEthernet0/0), from 155.1.67.7, Send flag is 0x0
      Composite metric is (3072/512), Route is Internal
      Vector metric:
        Minimum bandwidth is 100000 Kbit
        Total delay is 120 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 2
Rack1R6#

After setting delay 48 on fa 0/0:

Rack1R6#show ip route 155.1.67.0
Routing entry for 155.1.67.0/24
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Redistributing via eigrp 100
  Routing Descriptor Blocks:
  * directly connected, via FastEthernet0/0
      Route metric is 0, traffic share count is 1

Rack1R6#

Thanks,
Wouter

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