12-25-2016 08:01 AM - edited 03-08-2019 08:42 AM
Hi all,
I inherited this setup with 1 router and 1 L3 switch as illustrated in the diagram below.
The 10.10.10.1 and 10.10.10.2 are routed ports.
The 192.168.1.1 is an SVI and not a routed port.
EIGRP is setup between R1 and S2 for the below networks
192.168.0.0/24
10.10.10.0/24
192.168.1.0/24
R3 is not added as part of the EIGRP setup.
Right now, in R1, I have a EIGRP route to reach 192.168.1.0 network as below
D 192.168.1.0/24 via 10.10.10.2 S0/0
In S2, I have a static route that go to 192.168.3.0/34 to exit via gateway 192.168.1.2
S 192.168.3.0/34 via 192.168.1.2
q1) Assuming if i want to setup a route in R1 to the 192.168.3.0/24 in R3 below, is there any differences between
a) static route with gateway to the SVI in S2
192.168.3.0 255.255.255.0 192.168.1.1
b) static route with gateway to R3
192.168.3.0 255.255.255.0 192.168.1.2
c) turn on EIGRP on R3 entirely
Reason for asking this question is I have more routes in R3 and I have both method a) and b) running in Live now. I am thinking of doing c) but i am thinking of is there any differences between them a) , b) and c)
All i can think of now is in R1, the inefficiency is that I will need 2 lookup if i use the static route method
1st is to lookup how to go to 192.168.3.0, (and it must go to the 192.168.1.0 network)
2nd is to lookup how to go to 192.168.1.0 network.
q2) Is there any difference between a) and b) methods -> such that when the packet destined to 192.168.3.0/24 reaches S2 (10.10.10.2 interface),
for method A , it will have to go the SVI before going to R3 while
for method B, the packet will go to R3 directly ?
Regards,
Noob
12-25-2016 10:48 PM
Just enable EIGRP on R3
with networks
192.168.1.0/24
and
192.168.3.0/24
let the routing protocol sort out the routes
BTW
192.168.1.0/24 on R1 EIGRP is not required, as it is not a directly connected interface.
12-25-2016 10:51 PM
also add the 192.168.1.0 network to the EIGRP on S2
12-30-2016 08:48 PM
Hi Richard,
Thanks for your reply and sorry for the late response.
I understand turning on EIGRP will solve all these dilemma, but i am specifically interested to know the difference on method a) and b) in q2.
Hope you are able to let me know your thoughts.
Regards,
Noob
12-30-2016 09:47 PM
the static route
192.168.3.0 255.255.255.0 192.168.1.1 on S2 will not get you very far, as it is not actually pointing to the gateway for the 192.168.3.0 network
whereas
192.168.3.0 255.255.255.0 192.168.1.2 on R2 will work,
and R3 must have routes back as below
192.168.1.0 255.255.255.0 192.168.1.1
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