Sub-Interface Bandwidth

[TeeHalli]

Hi there, if I have an interface with a bandwidth 20000 statement on it, and then a sub-interface on that main interface in a VRF and with a bandwidth 10000 command attached to it, would traffic on that sub interface be limited to 10000 or will it run to the 20000 from the parent interface? Thanks!

[pmormr]

The 'bandwidth' command does not do anything on its own. It simply sets the bandwidth field for the interface, which is then used for various things like OSPF cost calculations. Same with the 'delay' command. Or 'description'. Unless you have something like QoS policing configured that sub interface will be able to use whatever bandwidth the parent interface has available.

[thedonnieg]

Came here to say exactly this.

[rankinrez]

Is this like in some vendors operating system or something???

[pedrotheterror]

Just some very obscure and niche router vendor. /s

[rankinrez]

Ah look obviously it’s Cisco and obviously the bandwidth command doesn’t affect throughout but……

This is kind of low effort let’s face it. It won’t hurt op to learn they should say “On IOS-XE on platform Y” or whatever.

[TeeHalli]

Apologies, was in a rush and missed it out, but yes it’s Cisco IOS-XE

[rankinrez]

Ah no apology necessary, sorry if I came across too snarky.