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default gateway

Answered Question
Jul 10th, 2013
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Hi,


This is a naive question.

We have a layer 3 4500 switch configured with interface SVI ip 192.168.100.1/24.

connected to this is a 3750 with ip 192.168.100.11/24 ( default gateway to 192.168.100.1).


there is a third edge switch, a 3750, connected to this second 3750 with ip 192.168.100.21. What happens if i give default gateway on this edge 3750 switch to be 192.168.100.11? will it work.


the SVI is on the 4500, so instead of giving the SVI as default gateway on third switch , we are giving 192.168.100.11 as its gateway.

Any workstation connected to this third switch , if configured with default gateway of 192.168.100.11, wil this work.


will this cause any issues?


Appreciate all help.

Correct Answer by Seb Rupik about 4 years 1 month ago

It would be a strange configuration but it would work. What you are introducing is asymmetric routing in a single segment. Traffic destined to remote subnets from clients attached to the third switch will send packets to the third switch SVI but recieve them from the 4500's SVI . Unless you configure the 4500 with a static route to forward packets destined with the subnet subset connected to the third switch to be routed to it's SVI.


Issues wise, you may cause some tiny additonal delay to workstations on the third switch as the routing to the 4500 takes place.


cheers,

Seb.

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Correct Answer
Seb Rupik Wed, 07/10/2013 - 03:48
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It would be a strange configuration but it would work. What you are introducing is asymmetric routing in a single segment. Traffic destined to remote subnets from clients attached to the third switch will send packets to the third switch SVI but recieve them from the 4500's SVI . Unless you configure the 4500 with a static route to forward packets destined with the subnet subset connected to the third switch to be routed to it's SVI.


Issues wise, you may cause some tiny additonal delay to workstations on the third switch as the routing to the 4500 takes place.


cheers,

Seb.

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