6500 - subinterface vlan X interface vlan config

[marceloazevedo]

What are the pros and cons between configuring one 6500 port usint subinterface comands or creating all vlans and assign them to one port.

So far I know:

- doing sub-int you can no create the same vlan number in any other port

- sub int don't allow vlan access list.

But what about performance, security...

here it is the configs:

interface GigabitEthernet1/3

description physical interface

no ip address

!

interface GigabitEthernet1/3.998

description subinterface for vlan 998

encapsulation dot1Q 998

ip address 98.98.98.98 255.255.255.0

no cdp enable

!

interface GigabitEthernet1/3.999

description subinterface for vlan 999

encapsulation dot1Q 999

ip address 99.99.99.99 255.255.255.0

no cdp enable

++++++++++++++++++++++++++++++++++++++++

vlan 98-99

interface Vlan 98

description int vlan 98

ip address 98.98.98.98 255.255.255.0

no cdp enable

interface Vlan 99

description int vlan 99

ip address 99.99.99.99 255.255.255.0

no cdp enable

interface GigabitEthernet3/1

desc trunk 98 99

switchport

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 98-99

switchport mode trunk

no ip address

no cdp enable

Thanks

Marcelo

[Prashanth Krishnappa]

If it is just for routing, I would go with Interface VLANs and not sub-interfaces. Also, you did not mention what kind of Supervisor/IOS you have. 12.2(18)SXE is the first release to support sun-interfaces on a layer 3 interface:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/layer3.htm#wp1040486

[m.mcconnell]

Just for flexibility, I craete VLAN interfaces for actual VLANs where server or users are going to be connected. As you stated, then I can put that VLAN on any port on the switch and still perform L3 services.

For router connections on a 6500 I create a routed interface where the physical interface has the IP address. But since it is a router connection I have never really needed to do multiple VLANs on those interfaces.

Just some basic rules I follow for design/implementation. Keeps the LAN flexible and efficient.

-Mark

[attrgautam]

I use VLAN simply if i wanted to do RSTP and not routing protocols. Allows me to have better redundancy through ether channels, flex-links etc.... In short, VLANs allow you to augment BW sub-interfaces have BW equal to the main interface.

[marceloazevedo]

Hi!

Thanks for the feedback.

I am planning to run MPLS and BGP.

I am using a sup 720 with 12.2.18(sx)

Thanks

[spremkumar]

Hi

You wont be able to run MPLS with sup720 u either require sup 7203B or sup 7203BXL.

do refer this link for more info..

http://cisco.com/en/US/products/hw/switches/ps708/products_data_sheet09186a0080159856.html

regds