EIGRP Route Summarisation question...

ruski

When you've got config like this:

Router eigrp
Network 2.0.0.0
Network 10.0.0.0
!
Interface serial 0/0
Ip summary-address eigrp 101 2.1.0.0 255.255.0.0
!

Will the neighboring router have two routes or one from the router configured with the above config?

Ie. Will it have 2.0.0.0/8 summarized route and 2.1.0.0/16 manual summarised route or just the former?

Does it make a difference if no auto-summary is on or off?

I tried reading the cisco docs but they don't seem to cover this specific scenario.

IMO, you'd only get 2.0.0.0/8 because auto summary is on by default, but then theres conflicting info somewhere that says you'd get both routes in the neighboring routing table.

ruski

OK solved my own problem here by setting up dynamips.

It'd show both the auto summarised route of /8 and the injected summary route of /16 as per show ip route below:

R2#sho ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
D 2.0.0.0/8 [90/156160] via 10.10.1.1, 00:00:05, FastEthernet1/0
D 2.1.0.0/16 [90/156160] via 10.10.1.1, 00:00:05, FastEthernet1/0
10.0.0.0/24 is subnetted, 1 subnets
C 10.10.1.0 is directly connected, FastEthernet1/0
R2#