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why does static route exist when there's eigrp summary route?

we have a cisco2621,ios is 12.2 or 12.0.7t,configuration is as follows:

interface FastEthernet0/0

ip address 82.0.0.1 255.255.255.0

no ip directed-broadcast

duplex auto

no sh

speed auto

£¡

router eigrp 100

network 82.0.0.0

no auto-summary

!

ip route 1.0.0.0 255.0.0.0 82.0.1.2

when we shut down fa0/0,static route disappear.after fa0/0 goes up, static route appear.That's right.

Then,we add such configuration:

int f0/0

ip summary-address eigrp 100 82.0.0.0 255.0.0.0

and shut down fa 0/0 again,the routing table seems strange:

S 1.0.0.0/8 [1/0] via 82.0.1.2

82.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

D 82.0.0.0/8 is a summary, 00:00:51, Null0

C 82.0.0.0/24 is directly connected, FastEthernet0/0

static route exist when there's eigrp summary route.

Is it the ios problem?for I tried in the 12.0.5T,static route will disappear after fa 0/0 shutdown.

thanks.

cx

1 REPLY
Gold

Re: why does static route exist when there's eigrp summary route

The static route should show as reachable as long as there is a path to the next hop, 82.0.1.2, in the routing table. As long as the summary exists, the static will stay in the table, in other words. Now, once all of the components of the summary are gone (something I can't see from the information you've provided), then the static should go away.

Are you seeing the summary in the table after the interface is shut down? Are there any other components of the summary space in the routing table for eigrp to summarize on?

Russ

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