Default VLAN on Cisco catalyst 2950

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Feb 6th, 2008
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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



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syedsohailsarwar Wed, 02/06/2008 - 10:28
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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)

Jon Marshall Wed, 02/06/2008 - 10:31
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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

srue Wed, 02/06/2008 - 11:14
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If you change the subnet mask of the management interface, you face the risk of not being able to reach it through the network.

glen.grant Wed, 02/06/2008 - 16:17
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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.

syedsohailsarwar Fri, 02/08/2008 - 07:42
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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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