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Why does the VLAN on my 2910al need an IP address?

 
JustHelpDesk
New Member

Why does the VLAN on my 2910al need an IP address?

I've got a bunch of 2910al switches that our previous networking expert configured.  I'm configuring a new switch and I'm looking at the configuration of one of his old switches and trying to mimick it.  This is the config on the old switch:

 

vlan 21
   name "Servers"
   untagged 37-44
   tagged A1,B1
   ip address 10.X.X.1 255.255.255.0
   ip helper-address 10.X.X.17
   ip helper-address 10.X.X.18
   exit

 

Why do I have to give this new switch's VLAN 21 the address 10.X.X.10?  (this is our 10th switch so I'm going in order, hence .10)

 

1 REPLY 1
Richard Litchfield
Respected Contributor

Re: Why does the VLAN on my 2910al need an IP address?

You probably don't, but it also won't make any difference in most circumstances. Unless the switch is routing, it really only needs one IP address for management, and the core switch will do the routing.

 

You also only really need one IP address helper on each subnet. You can have multiples (maybe 2 for some level of HA).