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I have the following topology set on AWS where there are 4 CSR 1000v Routers deployed and Segment Routing enabled in which the Segment Routing Headend is R1 and the destination is R3.

I aim to send iperf traffic from Endpoint1(Client) to Endpoint2 (Server) with the following SR path = {R1, R2, R3, R4, R3, R2, R1, R2, and R3}. enter image description here First of all, the traffic generated by iperf from Endpoint1 a linearly increasing UDP traffic until I stop manually. Using SNMP and Cacti I could get throughput across the links (GRE Tunnels) which are summarized below.

I set all tunnels' bandwidth as 10Mbps, I was expecting to see packet loss but I didn't. It is obvious from the plots that the throughput has exceeded the tunnels' bandwidth. However, no packet loss is recorded.

enter image description here enter image description here

here's the tunnel's configuration:

interface Tunnel0 bandwidth 10000 ip flow monitor NTAMonitor input ip flow monitor NTAMonitor output ip address 10.10.1.1 255.255.255.252 ip router isis aws load-interval 30 mpls traffic-eng tunnels keepalive 2 3 tunnel source GigabitEthernet1 tunnel destination 52.27.173.12 tunnel path-mtu-discovery isis metric 1

it is basically the same as the other tunnels' configuration except for the name, address and destination address.

the show platform hardware throughput level shows 200000000 kb/s

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1 Answer 1

Reset to default
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The bandwidth command sets the reported bandwidth and is used for metric calculation only. It does not affect the actual interface bandwidth.

If you want to limit bandwidth, you will need to implement traffic shaping/policing.

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  • Thanks! would implement traffic shaping/policing help to record packet loss that happens over the tunnel? Commented Aug 9, 2019 at 17:17
  • You would see drop information in the policy you apply to the interface, not the tunnel itself. Commented Aug 9, 2019 at 17:19
  • What about the tunnel? I am actually interested to see losses on tunnels. Commented Aug 9, 2019 at 17:21
  • Sorry, that's not how things work. Commented Aug 9, 2019 at 17:23
  • Okay! Thanks Ron! One question, when I set the policies, am I able to see the loss using SNMP ? Commented Aug 9, 2019 at 17:38

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