packets with reserved multicast protocols:
ovs-ofctl add-flow br0 \
- "table=0, dl_dst=01:08:c2:00:00:00/ff:ff:ff:ff:ff:f0, actions=drop"
+ "table=0, dl_dst=01:80:c2:00:00:00/ff:ff:ff:ff:ff:f0, actions=drop"
We could add flows to drop other protocols, but these demonstrate the
pattern.
difficult with our simulated switch, since it's not visible to the
operating system.
-Bur our simulated switch has a few specialized testing tools. The
+But our simulated switch has a few specialized testing tools. The
most powerful of these tools is "ofproto/trace". Given a switch and
the specification of a flow, "ofproto/trace" shows, step-by-step, how
such a flow would be treated as it goes through the switch.
Try this command:
- ovs-appctl ofproto/trace br0 in_port=1,dl_dst=01:08:c2:00:00:05
+ ovs-appctl ofproto/trace br0 in_port=1,dl_dst=01:80:c2:00:00:05
The output should look something like this:
- Flow: metadata=0,in_port=1,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=01:08:c2:00:00:05,dl_type=0x0000
- Rule: table=0 cookie=0 dl_dst=01:08:c2:00:00:00/ff:ff:ff:ff:ff:f0
+ Flow: metadata=0,in_port=1,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=01:80:c2:00:00:05,dl_type=0x0000
+ Rule: table=0 cookie=0 dl_dst=01:80:c2:00:00:00/ff:ff:ff:ff:ff:f0
OpenFlow actions=drop
Final flow: unchanged
Try another command:
- ovs-appctl ofproto/trace br0 in_port=1,dl_dst=01:08:c2:00:00:10
+ ovs-appctl ofproto/trace br0 in_port=1,dl_dst=01:80:c2:00:00:10
The output should be:
- Flow: metadata=0,in_port=1,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=01:08:c2:00:00:10,dl_type=0x0000
+ Flow: metadata=0,in_port=1,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=01:80:c2:00:00:10,dl_type=0x0000
Rule: table=0 cookie=0 priority=0
OpenFlow actions=resubmit(,1)
Make the flow that we add to flow table 10 match the same VLAN
ID that the packet we're currently processing contains. This
effectively scopes the MAC learning entry to a single VLAN,
- which is the ordinary behavior for a VLAN-aware siwtch.
+ which is the ordinary behavior for a VLAN-aware switch.
NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[]