Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Bandwidth on SVI interface

Hi all,

the bandwidth on an SVI interface is showing as 1000000 kbit (1gbps) even though we have 20g etherchannels on this VLAN to other switches.

My question is, will this incorrect bandwidth setting have any affect on routing decisions that OSPF would make? i imagine the rxload and txload are based on the bandwidth setting and in our monitoring system I am seeing that the SVI is always maxed at 1gbps when i know it is not an issue because we have 20g etherchannels.

What is the recommendation for bandwidth settings on SVI's?



Super Bronze

DisclaimerThe Author of this


The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.


Yes, an "incorrect" bandwidth might lead OSPF to select an "incorrect" path as Cisco's OSPF implementation, uses "bandwidth" to compute the OSPF metric.

What you ought to set a SVI's bandwidth to depends on what you want it to represent.  For example, in theory, a SVI's bandwidth would be the aggregate of all the ports in the VLAN, but it's unlikely all those ports will be a path to an adjacent OSPF neighbor.  So, you might select the bandwidth to your OSPF neighbor, but that might be inaccurate if you have more than one in the VLAN.

You also can directly set OSPF cost.

Basically, one-size doesn't fit all, it's what makes most sense to you.  For example, you might want bandwidth to actually represent the aggregate bandwidth, for bandwidth usage analysis, and use OSPF cost to "engineer" your OSPF path selection.

CreatePlease login to create content