Re: Q on Configuring an Access_Switch ...

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Sep 25th, 2008
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Hello,

My question is that I am setting up a 3750 access switch. My management vlan is vlan 1 and I have one data vlan which is vlan 2. The default-gateway is the interface vlan ip of vlan 2

which is created on the distribution router.


Here is the config for this basic setup :-


-----------------------------------------3750 Access Switch


vlan 1

name Mgmt_Vlan

!

vlan 2

name Data_Vlan

!

!

int Vlan1

description *** Management Vlan ***

ip add 139.200.1.40 255.255.255.0

!

!

ip default-gateway 139.200.2.251 <<<<<<<<


-----------------------------------------


My question is would the above setup okay or do I need to change it to the ip of the interface vlan 1 on the distribution router ?

It should work but I would just like to double confirm this simple setup.



Thank you,


Cheers,

- InternetB -

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glen.grant Thu, 09/25/2008 - 18:25
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It should be the router address for vlan 1 . If using a default gateway make sure routing is turned off on the 3750 .

InternetB Thu, 09/25/2008 - 19:40
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Hello Glen,


[1] Thank you for the post. The reason that the 3750 needs its gateway pointing to the interface of vlan 1 is because the SVI on the 3750 is on vlan 1/ same IP subnet ?


Just want to understand the logic.


Thank you,


Cheers,

- InternetB -

Jon Marshall Fri, 09/26/2008 - 00:37
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"The reason that the 3750 needs its gateway pointing to the interface of vlan 1 is because the SVI on the 3750 is on vlan 1/ same IP subnet ? "


Yes because the 3750 is only acting as a L2 device you can only have vlan interface in use and that should be for management. So this vlan 1 interface is used purely to gain access to the switch and not for any user data. The default-gateway is needed so you can remotely telnet into the switch.


Note as a side issue Cisco recommends using a vlan other than vlan 1 for managing your switches. It's not vital so don't worry, it's just best practice.


Jon


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