Sub-interfaces

dacruzer1 · ‎06-14-2010

Hi Everyone,

I have a 7204 VXR Router, all the ports are being used except for one Fa3/0. I am about to create three networks, 192.168.3.0/24, 192.168.4.0/24 and 192.168.5.0/24. I'm thinking of creating sub-interfaces on Fa3/0 but before I do that, does anyone know what is the maximum sub-interface I can create on a Fast Ethernet port and what is the dis-advantage of creating sub-interfaces?

Thanks.

vmiller · ‎06-14-2010

Read the following link on Router IDB's.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_tech_note09186a0080094322.shtml

As far as disadvantages to using the sub interface idea, I'd suppose that high traffic volumes would give you issues.

Consider some form of throttling.

Chetan Kumar Ress · ‎06-14-2010

Hi

1] maximum sub-interface

---> Creating Sub-Interface on Fast Ether is nothing but associating with VLAN ID. The number of VLAN that you can create is the number of interface .

2] dis-advantage of creating sub-interfaces

---> Dis-Advantage is nothing but you need to take care of CPU , It will utilize CPU as you will add number of interface.

Regards

Chetan Kumar

dacruzer1 · ‎06-14-2010

What is the command to show the current CPU utilization?

THanks

Alfred

Chetan Kumar Ress · ‎06-14-2010

Hi

Below are the command to see CPU utilization

1] show processes cpu

2] show processes cpu history

Regards

Chetan Kumar