DMVPN Tunnel Bandwidth Upload and Download Speeds

[bravealikhan]

Hi Folks,

I'd like to ask the

bandwidh

command under the (spoke) DMVPN

Tunnel0

interface, does this controls the

bandwidth

Upload and Download ?

e.g. if we have 10 Mbps circuit, and under

Tunnel0

its configured as 1000, shows we have only 1Mbps Up/Down?

interface Tunnel0
bandwidth 1000

Thanks 

[Giuseppe Larosa · Accepted solution]

Hello @bravealikhan ,

the interface

bandwidth

command has only an informative value it does not limit the actual speed of an interface even a logical interface like a

tunnel

It is usually set to values for interactions with EIGRP routing protocol or for

QoS

purposes as modular

QoS

would use the

bandwitdh

value as a reference for percentage calculations when configuring shapers or queueing for different traffic

classes class-maps

Hope to help

Giuseppe

[Joseph W. Doherty]

Ditto to @Giuseppe Larosa what describes.

Further, some interfaces run at a physical

bandwidth

usually only seen for WANs, where the provider may

cap

available

bandwidth

lower than port

bandwidth

and such caps might differ for ingress vs. egress.

Then, especially in something like DMVPN, different spokes or the hub may have

bandwidth

capabilities totally different.  (Site one has 10 Mbps down and 5 Mbps up while site two has 7 Mbps both up and down.  So, if you want to measure utilization percentage, what would you use for a base value?  [The answer is - "it depends".])

So, as Giuseppe noted

bandwidth

set on an interface, is a logical value although it often is set to represent the physical egress

bandwidth

available.  Except when tied to something that actually limits

bandwidth

like a

QoS shaper or policer

it has no physical

bandwidth

control, but even logically, it might have a routing protocol make an interface selection based on it, and/or interface stat usage percentages (including sometimes NMS using SNMP) will use that value for a base.

[MHM Cisco World]

I send you message check it

[bravealikhan]

Thank you all, really appreciated!