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New Member

Default VLAN on Cisco catalyst 2950

we are using cisco catalsyt and have mangement interface configured on it with all ports in VLan 1 (default Vlan)

IP assigned to management interface is say for example

int vlan 1

ip addr 172.16.20.253 255.255.255.128

the PCs attached to this switch have IP range as 172.16.20.1 to 172.16.20.252 with gateway as 172.16.20.254 and subnet mask as 255.255.255.128 on all PC's.

the Router interface towards LAN (ie switch ) has ip as 172.16.20.254 255.255.255.128

all remaining same , if i change the subnet mask assigned to management vlan from 255.255.255.128(/25) to 255.255.255.252 (/30), will it have any impact on the functioning of PCs . if no impact , then what is the purpose of assigning IP and netmask to interface Vlan 1 apart from management (eg telnet etc) purpose

  • LAN Switching and Routing
5 REPLIES
New Member

Re: Default VLAN on Cisco catalyst 2950

Kindly READ IP Range of PC's as

172.16.20.129 to 172.16.20.254

and not as 172.16.20.1 ( it was a typo)

Hall of Fame Super Blue

Re: Default VLAN on Cisco catalyst 2950

Hi

The management IP address assigned to vlan 1 does not effect the PC's, only your ability to manage the switch.

The purpose is exactly what you have said. The ability to remotely manage your switch rather than having to use a console connection and be physcially at the switch.

HTH

Jon

Gold

Re: Default VLAN on Cisco catalyst 2950

If you change the subnet mask of the management interface, you face the risk of not being able to reach it through the network.

Purple

Re: Default VLAN on Cisco catalyst 2950

I don't understand why you would change it.

172.16.20.253 falls into your pc range of 255.255.255.128 , why would you change it to a /30 , it would serve no purpose.

New Member

Re: Default VLAN on Cisco catalyst 2950

Hi Glen

i know it falls in same subnet but i faced this situation as one of my friends changed the subnet mask of management interface from /25 to /30

so i was bit inquisitive , wther it will have any impact

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