Layer 3 Switching

Answered Question
Feb 27th, 2008

Since we have enable layer 3 switching on our two 4506 switches, we have not been able to ping them. Any ideas that may help us resolve this issue.

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Correct Answer by wochanda about 8 years 9 months ago

If all you did was type 'ip routing' on the switches, you probably lost your default gateway.

With ip routing disabled, the switch relies on the 'ip default-gateway' command to see how to communicate with other networks.

Once you enable ip routing, we no longer use the 'ip default-gateway' command, but instead look in your routing table to see where to send packets.

To fix this, log into the switch and look for a command looking like this:

ip default-gateway 10.1.1.1

and convert it to this:

ip route 0.0.0.0 0.0.0.0 10.1.1.1

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Mohamed Sobair Wed, 02/27/2008 - 15:01

Hi,

You mean L3 routing, If you have Inter vlan routing enabled between Vlans, then make sure you gave them a layer-3 IP address.

you should also enable routing globally, with the (Ip routing) command.

HTH

Mohamed

Correct Answer
wochanda Wed, 02/27/2008 - 15:48

If all you did was type 'ip routing' on the switches, you probably lost your default gateway.

With ip routing disabled, the switch relies on the 'ip default-gateway' command to see how to communicate with other networks.

Once you enable ip routing, we no longer use the 'ip default-gateway' command, but instead look in your routing table to see where to send packets.

To fix this, log into the switch and look for a command looking like this:

ip default-gateway 10.1.1.1

and convert it to this:

ip route 0.0.0.0 0.0.0.0 10.1.1.1

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