topic Re: inter-vlan routing issue in Code Exchange

inter-vlan routing issue

Lalaram Raika — Sat, 01 Mar 2025 15:48:13 GMT

hi engineers

i have an issue with cat 9300

i have 9300 as core and downlink connected 3 cat 1300

all are with trunking ports , i have 5 vlans on core as following 192.168.1.0, 2.0, 3.0, 4.0, 5.0

each vlan have users but they are not able to ping each other

please help immidiate

Re: inter-vlan routing issue

liviu.gheorghe — Sat, 01 Mar 2025 15:55:22 GMT

Hello @Lalaram Raika ,

in order for inter-vlan routing to work, the PC's in a certain vlan should have the default gateway configured as the SVI IP address for that vlan on the 9300.

For example the vlan with subnet 192.168.1.0 should have a SVI configured on the 9300:

interface vlan 11

ip address 192.168.1.1 255.255.255.0

The rest of the SVI's are configured the same for the other vlans.

A PC in the vlan with subnet 192.168.1.0/24 would have to have the default gateway configured as 192.168.1.1

HTH

Re: inter-vlan routing issue

M02@rt37 — Sat, 01 Mar 2025 16:38:21 GMT

Hello @Lalaram Raika

Command #ip routing configured on c9300?

Do #show vlan and #show int status and share outputs please.

Re: inter-vlan routing issue

Lalaram Raika — Sun, 02 Mar 2025 05:09:35 GMT

M02@rt37 @liviu.gheorghe

Re: inter-vlan routing issue

M02@rt37 — Sun, 02 Mar 2025 08:19:51 GMT

Thanks @Lalaram Raika

Trunk on c1300 side are UP ?

VLANs are configured on c1300 ?

Each ports on c1300 where endusers are connected are in mode access ?

Re: inter-vlan routing issue

liviu.gheorghe — Sun, 02 Mar 2025 10:44:10 GMT

Hello @Lalaram Raika ,

are the PC's in the different VLAN's able to access external resources like the Internet?

I would also check the firewall settings on the PC's - maybe disable it to test connectivity between PC's in different VLAN's.

Also, are there any access lists configured on the SVI's?

And also, can a PC in VLAN 1 for example, ping

1. it's own gateway 192.168.1.1

2. ping the default gateway of VLAN 2 - 192.168.2.1

If both pings are successful, then check the firewall config on the PC's.

Re: inter-vlan routing issue

Lalaram Raika — Tue, 04 Mar 2025 09:14:09 GMT

all are fine

Re: inter-vlan routing issue

Lalaram Raika — Tue, 04 Mar 2025 09:16:26 GMT

all are fine but still not resolved

Re: inter-vlan routing issue

liviu.gheorghe — Tue, 04 Mar 2025 09:43:13 GMT

Have you seen my reply from 2 days ago? Have you performed the connectivity tests mentioned in the reply?

Re: inter-vlan routing issue

Lalaram Raika — Tue, 04 Mar 2025 09:47:43 GMT

yes

Re: inter-vlan routing issue

Lalaram Raika — Tue, 04 Mar 2025 09:48:21 GMT

could you share your contact please so i can reach directly

Re: inter-vlan routing issue

Lalaram Raika — Tue, 04 Mar 2025 10:56:50 GMT

As i already shown you in the configuration route is available , svi has ip , each user has gateway as svi ip and all uplink and downlink are int trunk mode, each switch has vlans and vlan1's user is reachable to gateway to another vlan's gateway

Re: inter-vlan routing issue

M02@rt37 — Tue, 04 Mar 2025 12:46:51 GMT

Ok @Lalaram Raika

All is good as concerned Network from your point of view ?

Have you check endpoint's side ? Windows PC ? Desactivated the Windows Firewall ?

Re: inter-vlan routing issue

liviu.gheorghe — Tue, 04 Mar 2025 14:16:59 GMT

What about:

And also, can a PC in VLAN 1 for example, ping

1. it's own gateway 192.168.1.1

2. ping the default gateway of VLAN 2 - 192.168.2.1

If both pings are successful, then check the firewall config on the PC's.

Can you confirm that both pings work?

Re: inter-vlan routing issue

Lalaram Raika — Wed, 05 Mar 2025 07:20:37 GMT

i think it's enough for your response but still not working

Re: inter-vlan routing issue

Lalaram Raika — Wed, 05 Mar 2025 07:21:44 GMT

Re: inter-vlan routing issue

liviu.gheorghe — Wed, 05 Mar 2025 07:28:26 GMT

This confirm my theory - from a PC in VLAN1 (192.168.1.148) you are able to ping the default gateway of VLAN2 (192.168.2.1) so the inter-vlan routing works on the switch.

Check the firewall on the PC - disable it and check again.

Re: inter-vlan routing issue

M02@rt37 — Wed, 05 Mar 2025 07:57:17 GMT

hello @Lalaram Raika

As I mention,

All is good as concerned Network from your point of view ?

Have you check endpoint's side ? Windows PC ? Disable the Windows Firewall ?