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Switch Default-Gateway Question

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rayroyaleverest
Level 1
Level 1

‎09-04-2007 04:34 AM - edited ‎03-05-2019 06:16 PM

How do I observer the default-gateway set on a switch? I am not able to view it with the "show running-config" command.

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mahmoodmkl
Level 7
Level 7

‎09-04-2007 04:51 AM

Hi

show running-config should list it.Check weather it is configured in the switch.

Btw what kind of this switch is.

Thanks

Mahmood

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dominic.caron
Level 5
Level 5
In response to rayroyaleverest

‎09-04-2007 05:53 AM

You should fing "ip default-gateway" in the config.

you can also have a IP route 0.0.0.0 0.0.0.0 entry if ip routing is enable.

The last possibility, (if the switch is working and no default gateway configure), is that the router is doing proxy-arp. This is a security issue but still possible.

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glen.grant
VIP Alumni
VIP Alumni

‎09-04-2007 07:03 AM

Use the command "show ip default " , this will list the gateway on all layer 2 switches and any layer 3 switch that has routing turned off .

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dominic.caron
Level 5
Level 5

‎09-04-2007 04:50 AM

What type of switch is it...CatOS or IOS

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rayroyaleverest
Level 1
Level 1
In response to dominic.caron

‎09-04-2007 05:06 AM

The switch type is IOS.

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mahmoodmkl
Level 7
Level 7

‎09-04-2007 04:51 AM

Hi

show running-config should list it.Check weather it is configured in the switch.

Btw what kind of this switch is.

Thanks

Mahmood

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rayroyaleverest
Level 1
Level 1
In response to mahmoodmkl

‎09-04-2007 05:47 AM

This is a Catalyst 2950 switch.

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dominic.caron
Level 5
Level 5
In response to rayroyaleverest

‎09-04-2007 05:53 AM

You should fing "ip default-gateway" in the config.

you can also have a IP route 0.0.0.0 0.0.0.0 entry if ip routing is enable.

The last possibility, (if the switch is working and no default gateway configure), is that the router is doing proxy-arp. This is a security issue but still possible.

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Jagdeep Gambhir
Level 10
Level 10
In response to dominic.caron

‎09-04-2007 06:19 AM

Hi,

2950 is a layer two switch , so IP route is not supported.

Regards,

~JG

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rayroyaleverest
Level 1
Level 1
In response to Jagdeep Gambhir

‎09-04-2007 06:37 AM

The IP default-gateway should be supported for telnet to other subnets.

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Jagdeep Gambhir
Level 10
Level 10
In response to rayroyaleverest

‎09-04-2007 06:43 AM

Yes, that is supported.

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glen.grant
VIP Alumni
VIP Alumni

‎09-04-2007 07:03 AM

Use the command "show ip default " , this will list the gateway on all layer 2 switches and any layer 3 switch that has routing turned off .

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rayroyaleverest
Level 1
Level 1
In response to glen.grant

‎09-04-2007 08:53 AM

The command "show ip" lists the switch ip address, subnet mask, and default gateway.

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