
Author Archives: Peter
Author Archives: Peter
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
------------------------------------------------------------
Client connecting to 10.4.2.2, TCP port Continue reading
cumulus@wbench:~$ curl http://leaf1:8080/ptmReturns the result:
{
"links": {
"L1": {
"node1": "leaf1",
"node2": "spine1",
"port1": "swp1s0",
"port2": "swp49"
},
...
}
}
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Figure 1: Two-Level Folded CLOS Network Topology Example |
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Figure 2: OF-DPA Programming Pipeline for ECMP |
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Credit: Accelerating Open vSwitch to “Ludicrous Speed” |