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Webcast-Catalyst9k
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inter-Vlan routing on native 6509

Hi...

For inter Vlan routing on a 6500 IOS switch, I understand that there is no need to configure a routing protocol since all vlans are directly connected.

But then, why is it required to configure a routing protocol to route packets between core & distribution switches.? Arent he distribution switches directly connected to the core switch, just like vlans?

Any help is appreciated.

Thanks

Moe

3 REPLIES

Re: inter-Vlan routing on native 6509

Hi Moe,

There is no need to have routing protocol between core and distribution switches if you have a trunk between core and distribution switches and all vlans which exist on distribution switch you have layer 3 logical interface configured on core switch or distribution switch or where ever you have configured inter vlan routing.

But incase you have some subnets behind the distribution switches which you want core to learn also and those subnet are not directly connected to core switch then you may need to run routing protoccol so that those subnets can be advertised to core switch.

HTH, if yes please rate the post.

Ankur

New Member

Re: inter-Vlan routing on native 6509

Thanks for the reply...

This means that if vlans are created on access layer switches then probably we need a routing protocol? Hope this is right.

Thanks..

Moe

Re: inter-Vlan routing on native 6509

Hi Moe,

If vlans are created at an access layer and you do not have that vlan at all on core layer switch them you may need routing protoccol to advertise those vlan subnet across to core layer switch so that your core may know that subnet.

But I will recommend to keep vlan information consistent across your lan and create vlan on access layer but propogate your vlan across distriution and core switch and create logical interface for those vlans on distribution or core switch for inter vlan routing and have trunks beteen access an distribution and core switch.

HTH, if yes please rate the post.

Ankur

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