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IOS 12.4.1a EIGRP BUG

fmerkle
Level 1
Level 1

System:2651XM 64F/256R with NM-16-ESW, WIC-1T.

The Router are calculating the EIGRP Delay wrong.

This is the same machine, we tested both IOS versions. No changes to the config are performed.

Is this a known bug ?

Software 12.4.1a

IP-EIGRP (AS 1): Topology entry for 0.0.0.0/0

State is Passive, Query origin flag is 1, 2 Successor(s), FD is 1812736

Routing Descriptor Blocks:

10.159.31.42 (FastEthernet0/0), from 10.159.31.42, Send flag is 0x0

Composite metric is (1812736/1810176), Route is External

Vector metric:

Minimum bandwidth is 2000 Kbit

Total delay is 20810 microseconds

Reliability is 255/255

Load is 14/255

Minimum MTU is 1500

Hop count is 7

External data:

Originating router is 10.159.253.7

AS number of route is 0

External protocol is Static, external metric is 0

Administrator tag is 0 (0x00000000)

Exterior flag is set

10.159.31.34 (FastEthernet0/1), from 10.159.31.34, Send flag is 0x0

Composite metric is (1812736/1810176), Route is External

Vector metric:

Minimum bandwidth is 2000 Kbit

Total delay is 20810 microseconds

Reliability is 255/255

Load is 14/255

Minimum MTU is 1500

Hop count is 7

External data:

Originating router is 10.159.253.7

AS number of route is 0

External protocol is Static, external metric is 0

Administrator tag is 0 (0x00000000)

Exterior flag is set

10.159.240.133 (Vlan925), from 10.159.240.133, Send flag is 0x0

Composite metric is (25922816/28416), Route is External

Vector metric:

Minimum bandwidth is 8000 Kbit

Total delay is 1000110 microseconds

Reliability is 255/255

Load is 1/255

Minimum MTU is 1500

Hop count is 2

External data:

Originating router is 10.159.253.7

AS number of route is 0

External protocol is Static, external metric is 0

Administrator tag is 0 (0x00000000)

Exterior flag is set

Software 12.3.15

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 323072

Routing Descriptor Blocks:

10.159.240.133 (Vlan925), from 10.159.240.133, Send flag is 0x0

Composite metric is (323072/28416), Route is External

Vector metric:

Minimum bandwidth is 8000 Kbit

Total delay is 120 microseconds

Reliability is 255/255

Load is 1/255

Minimum MTU is 1500

Hop count is 2

External data:

Originating router is 10.159.253.7

AS number of route is 0

External protocol is Static, external metric is 0

Administrator tag is 0 (0x00000000)

Exterior flag is set

1 Reply 1

jroyster
Level 1
Level 1

well it looks like your bandwidth and delay are different, which would cause the different metric.

I'd make sure the bandwidth statement is on all interfaces and do a show int on the path to see if delay is being calculated correctly. Maybe default behavior for a particular kind of interface changed?