Bandwidth assigned to gre tunnels?

registrato · ‎08-22-2007

Hello,

I'm using gre over ipsec and in the output of "sh int tunnel x" command I can see "BW 9 Kbit". Then, some lines below, i see:

"Tunnel transmit bandwidth 8000 (kbps)"

"Tunnel receive bandwidth 8000 (kbps)"

Can someone explain me what these three bandwidths are and why they are different?

If I wanted to limit the banwdidth of my gre tunnel, for example because I want to give each tunnel 10Mb, would a simple "bandwidth 10000" command on the tunnel interface do the trick?

Thank you

royalblues · ‎08-22-2007

Friend,

By default the IOS computes the bandwidth of a GRE tunnel as 9 Kbps

Bandwidth command under an interface has no significance on the actual bandwidth of the link. It is used by routing protocols like EIGRP & OSPF to compute their metric. ALso some NMS tools tend to take this bandwidth into consideration for calculation utilization % etc.

If you want to limit the bandwidth, then you have to use police/shape the traffic using QoS techniques

HTH, rate if it does

Narayan