Solved: Why can't change EIGRP summary route administrative distance?

gwhuang5398 · ‎10-09-2009

Router A and B are running 12.3(22). I configured a EIGRP summary route on router A interface toward B with various administrative distance values. But in router B routing table, the summary route is alway EIGRP route with distance 90.

Router A:

interface Ethernet 0/0

ip summary-address eigrp 1 192.168.0.0 255.255.0.0

Router B routing table:

D 192.168.0.0/16 [90/2684416] via 172.20.1.1, 00:00:30, Ethernet0/0

Isn't the summary router default to administrative distance of 5?

Thanks a lot

Lucien Avramov · ‎10-09-2009

R2(config-if)#do sh ip route 192.168.0.0

Routing entry for 192.168.0.0/16, supernet

Known via "eigrp 1", distance 5, metric 28160, type internal

Redistributing via eigrp 1

Routing Descriptor Blocks:

* directly connected, via Null0

Route metric is 28160, traffic share count is 1

Total delay is 100 microseconds, minimum bandwidth is 100000 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 1/255, Hops 0

Thats the type of output you will see.

Great I guess we can mark this post resolved.

View solution in original post

Jerry Ye · ‎10-09-2009

Distance value is locally significant.

When you configured summary address in router A, the admin distance of the summary route is 5. When router A send the route to router B, router B will see it as a native EIGRP route and assign it with a admin distance value of 90.

HTH,

jerry

Lucien Avramov · ‎10-09-2009

That changes the admin distance to 5 on router A.

Do a show ip route 192.168.0.0 on router A and you will see a route to null0 with an admin distance of 5.

gwhuang5398 · ‎10-09-2009

Thanks a lot. Somehow on router A routing table, it only shows the summary route to Null0, with no distance value attached.

I misunderstood that router B would give the received summary route a distance value 5. Now it's clear.

Thanks again

Lucien Avramov · ‎10-09-2009