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New Member

VLAN routing on layer 3 switch

Hi, I set up 2 VLANs on a C4900 switch. VLAN A and B can ping each other.

When server1 from VLAN A sends a tcp Sync to server2 in VLAN B, server2 can get the packet and reply it back to server1, but server1 can't get that backbound packet.

I think it shouldn't be a problem when the vlans are on a layer 3 switch and the switch does the routing, is that correct? TIA.

5 REPLIES
Hall of Fame Super Bronze

Re: VLAN routing on layer 3 switch

As long as you have ip routing enabled on the switch (you can verify this by typing show ip route and if the routing table is displayed you have routing running), the devices should be able to communicate with each other provided they have the correct IP Subnet and default gateway for their Vlan.

__

Edison.

New Member

Re: VLAN routing on layer 3 switch

Edison, your comment absolutely clarified my doubt. Thanks a lot.

Cisco Employee

Re: VLAN routing on layer 3 switch

NAT is not supported on the 4900 platform.

Regards,

jerry

New Member

Re: VLAN routing on layer 3 switch

No, it doesn't support NAT.

And no ACL for these 2 vlans either.

Thanks.

New Member

Re: VLAN routing on layer 3 switch

Hi

Do you have any ACL's or are you doing any NATing on either vlan?

Thanks

Kev

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