eigrp variance and traffic-share min...

From: Roger RPF (rpf@bluemail.ch)
Date: Sat Sep 06 2008 - 06:13:33 ART


Hi Group,

I have an understanding problem with eigrp-variance-traffic-share. Have a
look at the show output below.
I configured a variance of 4. Why is not the path with the lowest metric
choosen as the best for 2.2.2.2/32? The path over ser0/0.24 has the better
metric, 2297856.

When I configure the command traffic-share min across-interfaces, the path
with the lower metric over ser0/0.24 will be choosen. Is that "work as
excpected" for eigrp when we are using variance?

R4(config-router)#do sir 2.2.2.2
Routing entry for 2.2.2.2/32
  Known via "eigrp 24", distance 90, metric 2297856, type internal
  Redistributing via eigrp 24
  Last update from 143.43.25.2 on Serial0/0.24, 00:03:53 ago
  Routing Descriptor Blocks:
    143.43.25.2, from 143.43.25.2, 00:03:53 ago, via Serial0/0.24
      Route metric is 2297856, traffic share count is 60
      Total delay is 25000 microseconds, minimum bandwidth is 1544 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 1
  * 143.43.24.2, from 143.43.24.2, 00:03:53 ago, via FastEthernet0/1.24
      Route metric is 7210496, traffic share count is 19
      Total delay is 215000 microseconds, minimum bandwidth is 1500 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 1

R4(config-router)#do sh ip eigrp top
IP-EIGRP Topology Table for AS(24)/ID(4.4.4.4)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 2.2.2.2/32, 1 successors, FD is 2297856
        via 143.43.25.2 (2297856/128256), Serial0/0.24
        via 143.43.24.2 (7210496/128256), FastEthernet0/1.24
P 4.4.4.4/32, 1 successors, FD is 128256
        via Connected, Loopback1
P 143.43.24.0/24, 1 successors, FD is 7082496
        via Connected, FastEthernet0/1.24
P 143.43.25.0/24, 1 successors, FD is 2169856
        via Connected, Serial0/0.24

Many thanks in advance

Roger

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