EIGRP design

[sebastien3]

Hello,

On a network with 3 or 4 routers that exchange different routes/areas via EIGRP, what is the correct way to interconnect the routers ?

- 1 VLAN per router ? If I have 3 routers, should I use 3 VLANs :

R1-R2 [VLAN11] Subnet 10.0.1.0/30
R1-R3 [VLAN12] Subnet 10.0.1.4/30

R2-R1 [VLAN11] Subnet 10.0.1.0/30
R2-R3 [VLAN13] Subnet 10.0.1.8/30

R3-R1 [VLAN12] Subnet 10.0.1.4/30
R3-R2 [VLAN13] Subnet 10.0.1.8/30

- 1 same VLAN for all routers ?

R1-R2-R3 [VLAN11] Subnet 10.0.1.0/255.255.255.0

What is the best way ? Using the delay command will require an interface in order to favor one router over another.

Thanks

[MHM Cisco World]

no need multi VLAN between same neighbor 
config one same VLAN for all routers

[David Ruess]

Hello,

Are you talking about routers in the traditional sense? As in an actual router with routed interfaces. If so then they wont use VLANs. You just assign IPs in the same network for links that connect together and for your EIGRP adjacencies.

If you are trying to prefer one neighbor over the other in traffic, yes the Delay command is the preferred method as far as path manipulation of the metrics. You could also do an offset list that just increases the metric by a set ammount when applied to an interface.

-David