
Author Archives: Peter
Author Archives: Peter
New OVS instrumentation features aimed at real-time monitoring of virtual networks (Peter Phaal, InMon)This talk is a follow up to an Open vSwitch 2014 Fall Conference talk on the Continue reading
The talk will describe the recently added packet-sampling mechanism that returns the full list of OVS actions from the kernel. A demonstration will show how the OVS sFlow agent uses this mechanism to provide real-time tunnel visibility. The motivation for this visibility will be discussed, using examples such as end-to-end troubleshooting across physical and virtual networks, and tuning network packet paths by influencing workload placement in a VM/Container environment.
iperf -suThen run the following sequence of tests on Server1:
#!/bin/bash
RT="10.0.0. Continue reading
There is an interesting parallel with the Open vSwitch architecture, see Open vSwitch performance monitoring, which maintains a cache of active flows in the Linux kernel to accelerate forwarding. In the SDN routing case, active prefixes are pushed to the switch ASIC in order to bypass the slower software router.In this example, the software is being used in passive mode, estimating the cache hit / miss rates without offloading routes. The software has been configured to manage a cache of 10,000 prefixes. The first screen shot shows the cache warming up.
Cisco network engineers might not be familiar with the multi-vendor sFlow technology since it is a relatively new addition to Cisco products. The article, Cisco adds sFlow support, describes some of the key features of sFlow and contrasts them to Cisco NetFlow.Nexus 9000 switches can be operated in NX-OS mode or ACI mode:
[root@peer1 ~]# traceroute -s 192.168.250.1 192.168.251.1
traceroute to 192.168.251.1 (192.168.251.1), 30 hops max, 40 byte packets
1 192.168.152.2 (192.168.152.2) 3.090 ms 3.014 ms 2.927 ms
2 192.168. Continue reading
cumulus@server1:~$ while true; do iperf -c 10.4.2.2 -t 20; sleep 20; done
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Client connecting to 10.4.2.2, TCP port Continue reading