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LEN SNEED
Beginner

Problem changing Vlan 1 ip address

Hi,

I have a 3750 stack that connects to a 3560 at another site.  The are both on the inside of our network and basically a switch to switch connection.  The switchports are in vlan 901.  When I telnet from the 3750 to the 3560 and attempt to change the 3560's vlan 1 ip address I lose connectivity and can only get it back by going to the site and consoling into the 3560 to change the vlan 1 ip address back.  The 3750 vtp mode is server and the remote 3560 is vtp transparent.  Any ideas why this is happening?

Thanks,

Len.

1 ACCEPTED SOLUTION

Accepted Solutions
mlund
Rising star

Hi Len

The reason this is not working is because the vlan1 is not forwarded between the switches.

As I described in my previous contribution You have to have vlan1 forwarded between the switches.

The config You have now are only connecting vlan901, by making the g0/22 and g4/0/1 a trunkport and allowing vlan 1 and 901 will solve the problem.

Or You can connect a new cable between the switches and forward vlan1 that way.

Or, You can give the vlan1 interface on 3560 an ip address that is not overlapping with other neetworks.

/Mikael

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18 REPLIES 18
Reza Sharifi
Hall of Fame Expert