EIGRP Route Summarisation question...
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.
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.
Comments
-
ruski
Member Posts: 2 ■□□□□□□□□□
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#