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Unable to achieve 10G internet bandwidth on the CSR1000v router

san ju.
Level 1
Level 1

Hello There,

I have two CSR1000v routers running Cisco IOS XE Software, Version 17.03.04a. All interfaces are operating at 10G speeds, and the throughput level for both routers is set to 10G.

The current throughput level is 10000000 kb/s

Behind the routers, there are two Brocade VDX 6740 switches configured in VCS mode. The servers are connected to these switches via 10G links. The CSR1000v routers are hosted on the servers, and BGP sessions are established with the ISPs from the CSR1000v.

Here are the test results using iperf:

Virtual Machines in the Same VLAN on Different Servers:

- Transfer: 10.5 GBytes Bitrate: 9.00 Gbits/sec

Virtual Machines in Different VLANs on Different Servers:

- Transfer: 3.04 GBytes Bitrate: 2.61 Gbits/sec

Virtual Machine to a Public Server on the Internet:

- Transfer: 3.04 GBytes  Bitrate: 2.60 Gbits/sec

It seems the performance drops significantly when traffic crosses different VLANs or goes to the internet, suggesting something may be off in the CSR1000v. Despite all interfaces and links operating at 10G, I can't identify the root cause of this bottleneck.

Any insights or suggestions to resolve this issue would be greatly appreciated!

Thanks,
Punkn jr

16 Replies 16

Hello @san ju. ,

what model is the switch sitting between the CSR and the servers?

Regards, LG
*** Please Rate All Helpful Responses ***

@liviu.gheorghe  - Its extreme VDX6740T, To verify if the switch is causing any speed issues, I tested iperf (as mentioned in the first scenario) between a VM hosted on the same server as the active CSR and another VM on a different server. The results were as expected:

 

Debian:~# iperf3 -c 104.18.10.127
Connecting to host 104.18.10.127, port 5201
[  5] local 104.18.10.130 port 53988 connected to 104.18.10.127 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1.00 GBytes  8.60 Gbits/sec  1434   1.17 MBytes       
[  5]   1.00-2.00   sec  1011 MBytes  8.48 Gbits/sec   83   1.22 MBytes       
[  5]   2.00-3.00   sec   985 MBytes  8.26 Gbits/sec   80   1.26 MBytes       
[  5]   3.00-4.00   sec   985 MBytes  8.27 Gbits/sec   45   1.39 MBytes       
[  5]   4.00-5.00   sec  1016 MBytes  8.52 Gbits/sec  284    977 KBytes       
[  5]   5.00-6.00   sec   998 MBytes  8.37 Gbits/sec   16   1.10 MBytes       
[  5]   6.00-7.00   sec  1011 MBytes  8.48 Gbits/sec  144   1.30 MBytes       
[  5]   7.00-8.00   sec   999 MBytes  8.38 Gbits/sec   98   1.17 MBytes       
[  5]   8.00-9.00   sec   969 MBytes  8.13 Gbits/sec  284   1.09 MBytes       
[  5]   9.00-10.00  sec   985 MBytes  8.26 Gbits/sec   90   1007 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  9.75 GBytes  8.37 Gbits/sec  2558             sender
[  5]   0.00-10.00  sec  9.75 GBytes  8.37 Gbits/sec                  receiver

iperf Done.

 

Thanks,

Punkn jr

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