Communicate between subnets

[Praja9]

I have a SG500-28P switch and a number of layer 2 switches in my office network. Currently, we are using 10.202.0.1/23 and 10.202.1.1/23 networks. I need to configure 10.202.2.1/24 network and also communicate with the remaining network. What would be the proper core switch configuration for routing between subnets?

Thanks in advance.

[marce1000]

 - This thread will give you a number of guidelines :

                     https://community.cisco.com/t5/switching/how-to-configure-route-between-two-subnets-on-2960-s/td-p/1961733

 M.

[Praja9]

Thank you, I will have a look.

[Seb Rupik]

Hi there,

Assuming the new VLAN ID is 3 and Gi1 is connected to one of your Layer two switches which requires this new VLAN, the config will look like:

!
vlan 3
!
int vlan 3
  ip address 10.202.2.1 255.255.255.0
!
int gi1
  switchport trunk allowed vlan add 3
!

Assuming you do not have ACLs applied on the other two SVIs, you should have inter-VLAN communication with VLAN 3.

cheers,

Seb.

[Praja9]

Hi, thank you for the prompt reply.

I'm a little confused about vlan creation. 

Currently "show vlans" command says no vlans configured.

"show ip interface brief" shows two interfaces as up, but no vlans. 

Do I need to create a new vlan for the new subnet?

The new subnet is not on a single layer 2 switch but on several switches connected to the core switch.

[Seb Rupik]

In which case those two existing interfaces must be routed interface.

Can you share the output of sh ip int br ?

Can you give details of the topology, ie how the switches are connected? This will help us determine is an SVI or routed interface is appropriate for your new subnet.

[Praja9]

LVAA#sh ip int br
Interface                                   IP-Address         OK?         Method                     Status                      Protocol
Embedded-Service-Engine0/0 unassigned         YES          NVRAM           administratively down            down
GigabitEthernet0/0                   10.139.1.25        YES          NVRAM                        up                             up
GigabitEthernet0/1                   10.202.0.1          YES          NVRAM                         up                            up
GigabitEthernet0/0/0                unassigned         YES          NVRAM             administratively down         down

please find the attachment.

[Georg Pauwen]

Hello,

what are the exact models you have ? The SG500X/SG500XG/ESW2-550X do IPv4 routing, I think. What is the core switch you have (e.g. 4500/6500) ?

By the way, 10.202.0.1/23 and 10.202.1.1/23 are the same, that is, part of the same, large subnet.

[Praja9]

yes, it is the same network.

core switch SG500-28P

others SF100-24

Thanks.