01-04-2025 10:27 AM
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
01-05-2025 03:26 AM
Hello @san ju. ,
what model is the switch sitting between the CSR and the servers?
01-05-2025 04:45 AM
@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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