EIGRP metric calculation

[iores]

Hi,

Two routers, R1 and R2, are directly connected and are EIGRP neighbors. R1 redistributes static route. On R2 I am seeing the total delay of 410 microseconds for that redistributed static route. The R2's ingress interface on which the advertisement is received has delay of 400 microseconds. However, I don't know where this additional 10 microseconds is coming from. I can only see that R1's egress interface has delay of 10 microseconds.

The static route on R1 is redistributed using only 

redistribute static

command 

Any ideas?

[David Ruess · Accepted solution]

Hello,

Where does the static route point? If its to a loopback or an exit interface NOT towards R2 then I believe EIGRP will use that metric as part of the calculation. EIGRP uses the cumulative delay in its calculation so the addition of 400 + 10 seems correct.

-David

[MHM Cisco World · Accepted solution]

there is default-metric for any prefix redistribute into EIGRP 
so the delay is (delay to router redistribute static into EIGRP + default-delay) 

show interface x

<<- the interface between R1 and R2

check it delay 
then you can set default-metric in R1 for redistribute static into eigrp 

MHM

[iores]

I think I found the reason. As it turns out, if you redistribute static route without any seed metric, EIGRP by default will use delay and bandwidth of the egress interface. As a result, the delay on R1's egress interface out of which the prefix was advertised is 10 microseconds. 

[MHM Cisco World]

Yes 
there are two way 
1- config defualt-metric for all redistribute 
2- config the defualt seed for each redistribute 
if you dont config any of above you get default delay and that what you see in your case

MHM

[MHM Cisco World]

and for you and all other 
noter:- OSPF not included 
MHM

[paul driver]

Hello
I will agree with @David Ruess the next hop delay of that static route will be calculated.